Issue: 31st Novemeber 2017

BA307NE & BA327NEEx nA & Ex tcloop-powered

panel mounting indicatorsIssue 3

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1. Description

2. Operation2.1 Controls

3. Certification3.1 ATEX Ex nA certification3.2 Zones, gas groups & T rating3.3 4/20mA input3.4 Certification label information

4. System Design for Zone 2 Gas Hazardous Areas

4.1 Transmitter loops4.2 Remote indication

5. Installation5.1 Location5.2 Installation procedure5.3 Indicator earthing5.4 EMC5.5 Scale card

6. Configuration and Calibration6.1 Summary of configuration

functions.6.2 Indicator function6.3 Resolution6.4 Position of decimal point6.5 Calibration using an external

current source.6.6 Calibration using internal reference.6.7 Bargraph format and calibration6.8 Function of the P push button6.9 Tare function6.10 Security code6.11 Reset to factory defaults6.12 Under and over-range

7. Lineariser7.1 Lineariser calibration using an external

current source.7.2 Lineariser calibration using internal

reference.7.3 Lineariser error message7.4 Under and over-range7.5 Lineariser default configuration

8. Maintenance8.1 Fault finding during commissioning8.2 Fault finding after commissioning8.3 Servicing8.4 Routine maintenance8.5 Guarantee8.6 Customer comments

9. Accessories9.1 Scale card9.2 Tag information9.3 Stainless steel support plate9.4 Alarms

9.4.1 Solid state output9.4.2 Type nA certification9.4.3 Configuration and adjustment.9.4.4 Alarm enable9.4.5 Setpoint adjustment9.4.6 Alarm function9.4.7 Alarm output status9.4.8 Hysteresis9.4.9 Alarm delay9.4.10 Alarm silence time9.4.11 Flash display when alarm occurs.9.4.12 Access setpoint in display mode.9.4.13 Adjusting alarm setpoint from

the display mode. 9.4.14 Displaying setpoints on

BA327NE bargraph.9.5 Display backlight

9.5.1 Loop powering the backlight9.5.2 Separately powering the backlight.

Appendix 1 Use in an Ex e increased safety or Ex p pressurised enclosure located in Zone 2.

Appendix 2 ATEX dust certification

Appendix 3 IECEx gas and dust certification

Appendix 4 ETL and cETL certification

The BA307NE & BA327NE are CE marked to show compliance with the European Explosive AtmospheresDirective 2014/34/EU and the European EMC Directive 2014/30/EU

CONTENTS

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1. DESCRIPTIONThese panel mounting, Ex nA certified non-sparking digital indicators display the currentflowing in a 4/20mA loop in engineering units.They are loop powered but only introduce a 1.2Vdrop, which allows them to be installed into almostany 4/20mA current loop. No additional powersupply or battery is required.

The two models are electrically similar, but havedifferent displays.

Model Display BA307NE 4 digits 15mm high

BA327NE 5 digits 11mm high and 31 segment bargraph.

This instruction manual supplements theinstruction sheet supplied with each instrument.

The main application of both models is to display ameasured variable or control signal in a Zone 2gas hazardous area or a Zone 22 dust hazardousprocess area. The zero and span of the displayare independently adjustable so that the indicatorcan be calibrated to display any variablerepresented by the 4/20mA current, e.g.temperature, flow, pressure or level.

If required optional factory fitted dual alarms and agreen display backlight which can be loop orseparately powered, should be specified when theinstrument is ordered.

Both models have been issued with a commonType Examination Certificate ITS14ATEX48028Xby Notified Body Intertek Testing and CertificationLtd. This confirms compliance with the type ofprotection requirements for non-sparking Ex nAapparatus, and for dust ignition protection byenclosure Ex tc. This certificate has been used toconfirm compliance with the European ATEXDirective 94/9/EC.

The certificate number has an 'X' suffix indicatingthat the two indicators are subject to specialcondition for safe use. For installations in Zone 2the panel enclosure into which the indicators aremounted should comply with Ex n requirementswhich are defined in BS EN 60079-15. Theindicators may also be installed in an Ex e or Ex ppanel enclosure located in Zone 2 as described inAppendix 2.

Installation requirements for use in Zone 22 dusthazardous areas are described in Appendix 2..

The two indicators have also been issued with acommon IECEx Ex nA and Ex tc Certificate ofConformity which is described in Appendix 3.

For applications in the USA and Canada, bothmodels have ETL and cETL certification which isdescribed in Appendix 4.

2. OPERATIONFig 1 shows a simplified block diagram of bothmodels. The 4/20mA input current flows throughresistor R1 and forward biased diode D1. Thevoltage developed across D1, which is relativelyconstant, is multiplied by a switch mode powersupply and used to power the instrument. Thevoltage developed across R1, which is proportionalto the 4/20mA input current, provides the inputsignal for the analogue to digital converter.

Each time a 4/20mA current is applied to theinstrument initialisation is performed during whichall segments of the display are activated, after fiveseconds the instrument displays the input currentusing the calibration information stored in theinstrument memory.

If the loop current is less than 1.2mA the indicatorwill display the error message ‘LPLo’, below thisinput current the instrument will not functioncorrectly.

Fig 1 Indicator block diagram

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2.1 ControlsThe indicators are controlled and calibrated via thefour front panel push button switches. In thedisplay mode i.e. when the indicator is displaying aprocess variable, these push buttons have thefollowing functions:

P While this button is pushed theindicator will display the input current inmA, or as a percentage of theinstrument span depending upon howthe indicator has been configured.When the button is released the normaldisplay in engineering units will return.The function of this push button ismodified when optional alarms arefitted to the indicator.

While this button is pushed theindicator will display the numericalvalue and analogue bargraph* theindicator has been calibrated to displaywith a 4mAΦ input. When released thenormal display in engineering units willreturn.

While this button is pushed theindicator will display the numericalvalue and analogue bargraph* theindicator has been calibrated to displaywith a 20mAΦ input. When released thenormal display in engineering units willreturn.

E No function in the display mode unlessthe tare function is being used.

P + Indicator displays firmware numberfollowed by version.

P + Provides direct access to the alarmsetpoints when optional alarms arefitted to the indicator and the ‘ACSP’access setpoints in display modefunction has been enabled.

P + E Provides access to the configurationmenu via optional security code.

Notes: * BA327NE onlyΦ If the indicator has been calibrated

using the CAL function, calibration points may not be 4 and 20mA.

3. CERTIFICATIONBoth models have ATEX and IECEx gas and dustcertification. The main sections of this instructionmanual describes ATEX gas certification. ATEXdust approval is described in Appendix 2 andIECEx gas and dust certification in Appendix 3.

3.1 ATEX Ex nA certificationNotified Body Intertek Testing and Certification Ltdhave issued both instruments with a common TypeExamination Certificate numberITS14ATEX48028X. This has been used toconfirm compliance with the European ATEXDirective for Group II, Category 3GD equipment.The instruments carry the Community Mark and,subject to local codes of practice, may be installedin any of the European Economic Area (EEA)member countries and in the EEA EFTA states,Iceland, Liechtenstein and Norway. ATEXcertificates are also acceptable in Switzerland andTurkey. The European Commission's Blue Guidelists the member states, overseas countries andterritories that have adopted harmonisationlegislation.

This section of the instruction manual describesATEX installations in explosive gas atmospheresconforming with BS EN 60079-14:2008 Electricalinstallations design, selection and erection. Whendesigning systems for installation outside the UKthe local Code of Practice should be consulted.

3.2 Zones, gas groups and T ratingThe indicators have been certified as Group IICategory 3G Ex nA ic IIC T5 Gc apparatus andmay be used in an ambient temperature Tabetween – 40°C to +70°C. This is non-sparkingapparatus complying with BS EN 60079-15Equipment protection by type of protection 'n' thatminimises the risk of arcs or sparks capable ofcreating an ignition hazard occurring duringconditions of normal operation.

Special conditions for safe use are specified by theEx nA certificate indicated by the certificatenumber's 'X' suffix. These state that the indicatorsshould be correctly mounted in a panel enclosurecomplying with the requirements specified inBS EN 60079-15:2010 for Equipment protection bytype of Protection 'n'. For Category 3 installationsin Zone 2 self or third party certified Ex n, Ex e orEx p panel enclosures may be used. Additionalrequirement apply for non-metallic panelenclosures.

BS EN 60079-17 Electrical installations inspectionand maintenance permits live maintenance in Zone2 if a risk analysis demonstrates that this does notintroduce an unacceptable risk. The removal ofcovers [opening of Ex n enclosure] is permitted if

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this can be done without contaminating the interiorof the instrument with dust or moisture. Some end-users may prefer not to permit live maintenance tominimise risk.

The indicator's front panel push button contactsare non incendive and have been certifiedintrinsically Ex ic as shown on the TypeExamination Certificate. This allows the indicatorsto be adjusted and configured live when installed ina panel enclosure located in Zones 2 or 22.

When connected to a suitable system andcorrectly mounted in a panel enclosure complyingwith the requirements for Type of protection 'n', thepanel enclosure containing the BA307NE orBA327NE may be installed in:

Zone 2 explosive gas air mixture notlikely to occur, and if it does will only exist for a short time.

Be used with gases in groups:Group A propaneGroup B ethyleneGroup C hydrogen

In gases that may safely be used with equipment having a temperature classification of:T1 450oCT2 300oCT3 200oCT4 135oCT5 100oC

At ambient temperatures between -40 and +70oC.

This allows use with all commonly used industrialgases except carbon disulphide CS2.

3.3 4/20mA input The input safety parameters for the 4/20mA input,terminals 1 and 3 are:

Ii = 200mA

The indicators are current input instrumentsincorporating an internal protection circuit thatdefines the voltage developed between the inputterminals 1 and 3, therefore the ATEX certificatedoes not specify a maximum safety inputvoltage Ui.

3.4 Certification label informationThe certification label is fitted in a recess on thetop of the instrument. It shows the ATEXcertification information, BEKA associates nameand location, year of manufacture and theinstrument serial number. IECEx certificationinformation is also be shown.

BA307NE certification label

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4. SYSTEM DESIGN FOR USE IN ZONE 2 GAS HAZARDOUS AREAS.

4.1 Transmitter loopsWhen correctly mounted in Zone 2 both indicatorsmay be connected in series with almost any4/20mA current loop with apparatus in the safearea, or with Ex n, Ex e, Ex p or Ex d protectedapparatus located in Zones 1 or 2. The indicatorsare transparent to HART ® signals.

Because the BA307NE and BA327NE are notcertified intrinsically safe they should not beconnected to an intrinsically safe system.

There are four design requirements:

1. The indicator must be installed in a panelenclosure complying with the requirementsfor Ex n protection as shown in section 5 ofthis manual.

2. The certificate specifies that the indicatorshould be connected to a limited energy4/20mA circuit having a maximum outputcurrent of 200mA. A low voltage supply,usually 24V, that is safe in normal operationand suitable for live connection i.e. CEmarked, is usually considered acceptable.

3. Wiring must comply with Clause 9 ofBS EN 60079-14.

4. The loop must be able to tolerate theadditional 1.2V required to operate theindicator. This increases to 5.0V if theindicator is fitted with an optional backlightwhich is loop powered. See 9.5.1

Figs 2 illustrate a typical application in which aBA307NE or BA327NE located in Zone 2 isconnected in series with a 2-wire Ex d transmitterlocated in Zone 1. BEKA Application GuideAG310, which can be downloaded fromwww.beka.co.uk, contains examples of other Ex napplications.

Fig 2 Typical Zone 2 transmitter loop

To comply with the requirements ofBS EN 60079:14:2008 Electrical installationsdesign, selection and erection, each of the wiresentering the hazardous area should be individuallyfused and contain a means of isolation. These tworequirements are frequently satisfied by usingswitch fuse holders with easily removable fuseswhich can be extracted to achieve isolation asshown in Fig 20. This is a satisfactory method atthe low voltages and currents common ininstrumentation systems. Clear identification of,and easy access to the means of isolation isessential for their effective use. It is also necessaryto ensure that the maintenance procedure makessure that unauthorised re-closure of the switchesdoes not occur. It is not considered necessary tohave a means of isolation or electrical protectionfor the screen.

For some applications Ex nA instrumentationenergised by a current limited power supply orinstrument that can be switched off, is oftenconsidered adequate and to comply with therequirements of the standard.

4.2 Remote indicationThe BA307NE and the BA327NE may also bedriven directly from a safe area instrument with a4/20mA output to provide a remote display within aZone 2 hazardous area.

There are four design requirements:

1. The indicator must be installed in a panelenclosure complying with the requirementsfor Ex n protection as shown in section 5 ofthis manual.

2. The certificates specify that the indicatorshould be connected to a limited energy4/20mA circuit having a maximum outputcurrent of 200mA. An instrument located inthe safe area that is safe in normal operationand has a 4/20mA output suitable for liveconnection i.e. CE marked, is usuallyconsidered acceptable.

3. Wiring must comply with Clause 9 ofBS EN 60079-14:2008.

4. The output from the safe area 4/20mAinstrument must be able to supply the 1.2Vrequired to operate the indicator. Thisincreases to 5.0V if the indicator includes anoptional backlight which is loop powered.See 9.4.1

Fig 3 shows a typical application.

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Fig 3 Remote indication in Zone 2 hazardous area

To comply with the requirements ofBS EN 60079:14 Electrical installations design,selection and erection, each of the wires enteringthe hazardous area should be individually fusedand contain a means of isolation. These tworequirements are frequently satisfied by usingswitch fuse holders with easily removable fuseswhich can be extracted to achieve isolation asshown in Fig 20. This is a satisfactory method atthe low voltages and currents common ininstrumentation systems. Clear identification of,and easy access to the means of isolation isessential for their effective use. It is also necessaryto ensure that the maintenance procedure makessure that unauthorised re-closure of the switchesdoes not occur. It is not considered necessary tohave a means of isolation or electrical protectionfor the screen.

For some applications Ex nA instrumentationenergised by a current limited power supply orinstrument that can be switched off, is oftenconsidered adequate and to comply with therequirements of the standard.

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5. INSTALLATION

5.1 LocationWhen installed in a panel enclosure complying withthe requirements for Ex n protection as shown insection 3.2 of this manual, both indicators may belocated in a Zone 2 hazardous area providing thatthe operating temperature is between –40°C and+70°C and the installation complies with theindicator's certification requirements. CertifiedEx e panel enclosures are frequently used as Ex npanel enclosures.

The indicators may also be installed in an Ex e orEx p panel enclosure located in Zone 2 asdescribed in Appendix 1.

Both indicators have a stainless steel housingswith a 7J front of panel impact resistanceincorporating a 10mm thick toughened glasswindow which can withstand a 4J impact. This,together with a captive silicone gasket which sealsthe joint between the instrument and the panel,enclosure provides IP66 ingress protection. Bothindicators have IP20 rear protection.

Although the front of the indicators have IP66protection, they should be shielded fromcontinuous direct sunlight and severe weatherconditions.

Fig 4 show the overall dimensions of the indicatorstogether with the recommended panel enclosurecut-out dimensions.

Fig 4 Dimensions

5.2 Installation Procedure

a. Cut the aperture specified in Fig 4 in thepanel enclosure. Ensure that the edges ofaperture are de-burred.

b. Inspect the indicator's captive gasket andensure that it is not damaged before insertingthe indicator into the panel enclosureaperture.

c. If the enclosure panel is less than 1.0mmthick, or is non-metallic, an optional BEKAstainless steel support plate should be slidover the rear of the indicator before the panelclamps are fitted to evenly distribute theclamping force and prevent the enclosurepanel being distorted or creeping.

d. Slide a panel clamp into the two grooves at each corner of the indicator housing with the M3 stud protruding through the hole at the rear of the clamp. Fit the stainless steel spring washer over the stud and secure with the stainless steel wing nut.

e. Evenly tighten the four clamps to secure the instrument. The recommended minimumtightening torque for each wing nut is 22cNm(1.95 lbf in).

f. Connect the panel enclosure wiring to therear terminal blocks. To simplify installation,the terminals are removable so that wiringcan be completed before the instrument isinstalled. Wiring should be supported toprevent damage resulting from vibration.

g. Finally, fit a silicone rubber push-on cap tothe end of each M3 threaded rod.

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Fig 5 Installation procedure

5.3 Indicator earthingBoth indicators have an M4 earth stud on the rearpanel which should be electrically connected to thepanel enclosure in which the indicator is mounted,or to the plant equipotential conductor.

5.4 EMCBoth instruments comply with the requirements ofthe European EMC Directive 2004/108/EC. Forspecified immunity all wiring should be in screenedtwisted pairs, with the screens earthed in the safearea.

Fig 6 Rear terminals

5.5 Scale cardThe indicator’s units of measurement are shownon a printed scale card in a window at the righthand side of the display. The scale card ismounted on a flexible strip that is inserted into aslot at the rear of the instrument as shown in Fig 7.Thus the scale card can easily be changed withoutdismantling the indicator or removing it from theEx n enclosure in which it is mounted.

New indicators are supplied with a printed scalecard showing the requested units of measurement,if this information is not supplied when the indicatoris ordered a blank card will be fitted.

A pack of self-adhesive scale cards printed withcommon units of measurement is available as anaccessory from BEKA associates. Custom printedscale cards can also be supplied.

To change a scale card, unclip the protruding endof the flexible strip by gently pushing it upwardsand pulling it out of the enclosure. Peel theexisting scale card from the flexible strip andreplace it with a new printed card, which should bealigned as shown below. Do not fit a new scalecard on top of an existing card.

Install the new scale card by gently pushing theflexible strip into the slot at the rear of the indicator,when it reaches the internal end-stop secure it bypushing the end of the flexible strip downwards sothat the tapered section is held by the rear panel ofthe indicator.

Align the self-adhesive printedscale card onto the flexiblestrip and insert the strip intothe indicator as shown below.

Fig 7 Inserting flexible strip carrying scale card into slot at the rear of indicator.

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6. CONFIGURATION AND CALIBRATIONIndicators are configured and calibrated via thefour front panel push buttons. All the configurationfunctions are contained in an easy to use intuitivemenu that is shown diagrammatically in Fig 8.

Each menu function is summarised in section 6.1and includes a reference to more detailedinformation. When the indicator is fitted with alarmsadditional functions are added to the menu whichare described in section 9.3. Throughout thismanual push buttons are shown as P, E, or ,and legends displayed by the indicator are shownwithin inverted commas e.g. 'CAL' and ' ALr2'.

Access to the configuration menu is obtained byoperating the P and E push buttonssimultaneously. If the indicator security code is setto the default 0000 the first parameter 'FunC' willbe displayed. If a security code other than thedefault code 0000 has already been entered, theindicator will display 'CodE'. Pressing the P buttonwill clear this prompt allowing each digit of thecode to be entered using the and pushbuttons and the P button to move control to thenext digit. When the correct four digit code hasbeen entered pressing E will cause the firstparameter 'FunC' to be displayed. If the code isincorrect, or a button is not pressed within twentyseconds, the indicator will automatically return tothe display mode.

Once within the configuration menu the requiredparameter can be reached by scrolling through themenu using the and push buttons as shownin Fig 8. When returning to the display modefollowing recalibration or a change to any function,the indicator will display ‘dAtA’ followed by ‘SAVE’while the new information is stored in non-volatilememory.

All new indicators are supplied calibrated asrequested at the time of ordering. If calibration isnot requested, indicators will be supplied with thefollowing default configuration:

Default Configuration BA307NE BA327NE

Access code ‘CodE’ 0000 0000Function ‘FunC’ Linear LinearDisplay at 4mA ‘Zero’ 0.0 0.00Display at 20mA ‘SPAn’ 100.0 100.00Resolution ‘rESn’ 1 digit 1 digitBargraph start ‘BarLo’ ----- 0.00Bargraph finish ‘BarHi’ ----- 100.00P button in display mode ‘C-P’ % %Tare ‘tArE’ Off Off

6.1 Summary of configuration functionsThis section summarises each of the mainconfiguration functions and includes a crossreference to a more detailed description. Fig 6illustrates the location of each function within theconfiguration menu. The lineariser and theoptional factory fitted alarms are describedseparately in sections 7 and 9.3 of this manual.

Display Summary of function

'FunC' Indicator functionDefines the relationship between the4/20mA input current and the indicatordisplay. May be set to:

‘Std’ Standard linear relationship‘root’ Square root extraction‘Lin’ 16 segment adjustable

lineariser – see section 7.See section 6.2

'rESn' Display resolutionDefines the resolution of the leastsignificant display digit. May be set to‘1’, ‘2’, ‘5’ or ‘10’ digits.See section 6.3

'dP' Decimal pointPositions a dummy decimal pointbetween any of the digits or turns it off.See section 6.4

'CAL' Calibration of the digital displayusing an external current source.Enables the zero and span of theindicator to be adjusted using anexternal current source such as acalibrator. When used with an accuratetraceable current source this is thepreferred method of calibration.See section 6.5

'SEt' Calibration of display using internalreferences.Enables the zero and span of theindicator to be adjusted without theneed for an accurate input current ordisconnection from the 4/20mA loop.See section 6.6

'bAr' Bargraph format and claibration Only the BA327NE has a bargraph thebargraph may be conditioned to startfrom left, right or centre of the display,or it may be disabled. When optionalalarms are fitted it can also display bothalarm setpoints and the measuredvalue. The bargraph may be calibratedto start and finish at any value withinthe indicator’s calibrated digitaldisplay.See section 6.7

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Display Summary of function

'C - - P' Function of P push buttonThe indicator may be configured todisplay the input current in milliamps, orthe input current as a percentage of the4/20mA input when the P push button isoperated in the display mode.See section 6.8

'tArE' Tare function When enabled the tare function setsthe indicator display to zero when the Epush button is operated in the displaymode.See section 6.9

'CodE' Security codeDefines a four digit numeric code thatmust be entered to gain access to theconfiguration menu. Default code 0000disables this security function andallows unrestricted access to allconditioning functions.See section 6.10

'rSEt' ResetContains two sub-functions, ‘ConF’which returns the indicator to thedefault conditions shown in section 6.0and ‘LtAb’ which returns the lineariserto the default conditions shown insection 7.3. To prevent accidental useboth resets must be confirmed byentering ‘5urE’ before they will beexecuted. See section 6.11

6.2 Indicator function: ‘FunC’This configuration function defines the relationshipbetween the indicator’s 4/20mA input current andthe indicator’s display. Three alternatives areavailable:

‘Std’ Standard linear relationship‘root’ Square root extraction‘Lin’ 16 segment adjustable lineariser

To reveal the existing indicator function select'FunC' from the configuration menu and press P.If the function is set as required, press E to returnto the menu, or press the or button to changethe setting, followed by the E button to return to theconfiguration menu.

‘Std’ LinearProvides a linear relationship between the4/20mA indicator input current and theindicator display.

‘root’ Square root extractionPrimarily intended to linearise the squarelaw 4/20mA output from differentialflowmeters.

For reference, the following table showsthe output current from a non-lineariseddifferential flowmeter. % of full flow Current output mA

2.5 4.0110.0 4.1625.0 5.0050.0 8.0075.0 13.00

100.0 20.00When the root function is selected theindicator will display flow in linear units.

‘Lin’ 16 segment adjustable lineariserEnables non linear variables to bedisplayed by the indicator in linearengineering units. Use of the lineariser isdescribed in section 7 of this instructionmanual.

6.3 Resolution: rESnThis function defines the resolution of the leastsignificant display digit. Decreasing the displayresolution can improve the readability of a noisysignal. Select ''rESn' from the menu and press Pwhich will reveal the current display resolution. Tochange the resolution press the or button toselect 1, 2, 5 or 10 digits, followed by the E buttonto enter the selection and return to theconfiguration menu.

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6.4 Position of the decimal point: ‘dP’A dummy decimal point can be positioned betweenany of the digits or it may be absent. To positionthe decimal point select 'dP' from the menu andpress P. The decimal point can be moved bypressing the or push button. If a decimalpoint is not required it should be positioned beyondthe most or least significant digit. Whenpositioned as required press the E button to enterthe selection and return to the configuration menu.

6.5 Calibration using an external current source: ‘CAL’This function enables the zero and span of theindicator to be adjusted using an externalcalibrated current source. When used with anaccurate traceable current source this is thepreferred method of calibration.

Zero is the indicator display with 4mA inputSpan is the indicator display with 20mA input

To calibrate the indicator select 'CAL' from theconfiguration menu and press P. The indicator willdisplay 'ZEro' which is a request for a 4mA inputcurrent. Adjust the external current calibrator to4.000mA and again press P which will reveal thecurrent zero display. The flashing digit of theindicator display can be changed by pressing the or buttons, when set as required pressing Pwill transfer control to the next digit. When all thedigits have been adjusted, press E to enter thenew zero and return to the 'ZEro' prompt .

Pressing the button will cause the indicator todisplay 'SPAn' which is a request for a 20mA inputcurrent. Adjust the external current calibrator to20.000mA and again press P which will reveal theexisting span display. The flashing digit of theindicator display can be changed by pressing the or buttons, when set s required pressing Pwill transfer control to the next digit. When all thedigits have been adjusted press E to enter the newspan and return to the 'SPAn' prompt. Finallypress E again to return to the configuration menu.

Notes:a. The indicator input current must be adjusted to

the required value before the zero and spanfunctions are entered by pressing the P button.

b. Indicators may be calibrated at currents otherthan 4 and 20mA, withiin the range 3.8 to21.0mA providing the difference between thetwo currents is greater than 4mA. If theseconditions are not complied with, the indicatordisplays ‘FaiL’ and aborts the calibration.

c. If the zero current is greater than the spancurrent the instrument will be reverse actingi.e. an increasing input current will cause thedisplay to decrease.

6.6 Calibration using internal reference: ‘SEt’

Using the ‘SEt’ function the indicator can becalibrated without the need to know the value ofthe 4/20mA input current, or to disconnect theindicator from the 4/20mA loop.

When using the ‘Set’ function the indicator’sinternal reference is used to simulate a 4mA and20mA input current.

Zero is the display with a simulated 4mA inputSpan is the display with a simulated 20mA input

To calibrate the indicator display select 'SEt' fromthe configuration menu and press P. The indicatorwill display 'ZEro', pressing P again will reveal thecurrent display at 4mA. The flashing digit can beadjusted by pressing the or buttons, whenthe flashing digit is correct pressing P will transfercontrol to the next digit. When all the digits havebeen adjusted, press E to return to the 'ZEro'prompt.

To adjust the display at 20mA, press the buttonwhich will cause the indicator to display 'SPAn',pressing P will then reveal the indicator’s existingdisplay at 20mA. The flashing digit can beadjusted by pressing the or buttons, whenthe flashing digit is correct pressing P will transfercontrol to the next digit. When all the digits havebeen adjusted press E to return to the 'SPAn'prompt followed by E to return to the ‘SEt’ promptin the configuration menu.

6.7 Bargraph format and calibration: ‘bAr’ Only the BA327NE has a bargraphIn addition to a five digit numerical display theBA327NE has a 31 segment analogue bargraphwhich may be configured to start and finishanywhere within the indicator’s numerical displayrange.

To configure the bargraph select 'bAr' from theconfiguration menu and press P. The indicator willdisplay 'tYPE', pressing P again will reveal theexisting bargraph justification which can bechanged to one of the following four or five optionsusing the or button:

Bargraph justification starts from‘LEFt’ Left end of display‘CEntr’ Centre of display‘riGHT’ Right end of display‘AlrSP’ Only with alarms – see section 9.3‘oFF’ Bargraph disabled

When set as required press E to return to the‘tYPE’ sub-function prompt.

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The indicator’s digital display at which thebargraph starts is defined by the ‘bArLo’ sub-function which is selected by pressing the button followed by the P button which will revealthe current indicator display at which the bargraphstarts. The flashing digit can be adjusted bypressing the or buttons, when set as requiredpressing P will transfer control to the next digit.When all the digits have been adjusted, press E toreturn to the 'bArLo' prompt from which ‘bArHi’which defines the finishing point of the bargraphcan be selected by pressing the button. ‘bArHi’is adjusted in the same way as ‘bArLo’. When setas required, pressing E twice will return the displayto the ‘bAr’ prompt in the configuration menu.

Note: ‘bArLo’ must be set lower than ‘bArHi’,incorrect setting is indicated by the bargraph scaleflashing with a single bargraph segment activated.

6.8 Function of the P push button: ‘C - - P’When the indicator is in the display mode,operating the P push button will display the inputcurrent in milliamps, or the displayed value as apercentage of the difference between the displayedvalues at 4mA and 20mA inputs.

To check or change the function of the P pushbutton select 'C - -P' from the configuration menuand press P to reveal the current setting. Pressingthe or button will toggle the setting between'4-20' the current display in milliamps and 'PC' thepercentage display. When set as required pressE to return to the ‘C - - P’ prompt in theconfiguration menu.

6.9 Tare function: ‘tArE’The tare function is primarily intended for use withweighing system. When the indicator is in thedisplay mode and the tare function is activated,pressing the E button for more than three secondswill zero the indicator display and activate the tareannunciator. Subsequent operation of the E pushbutton for less than 3 seconds will return theindicator to the gross display and deactivate thetare annunciator.

To check or change the tare function select 'tARE'from the configuration menu and press P to revealthe current setting. Pressing the or buttonwill toggle the setting between 'on' and 'oFF'.When set as required press E to return to the‘tARE’ prompt in the configuration menu.

6.10 Security code: ‘CodE’Access to the instrument configuration menu maybe protected by a four digit security code whichmust be entered to gain access. New instrumentsare configured with the default security code 0000

which allows unrestricted access to allconfiguration functions.

To enter a new security code select 'CodE' fromthe configuration menu and press P which willcause the indicator to display the existing securitycode with one digit flashing. The flashing digit canbe adjusted using the and push buttons,when set as required operating the P button willtransfer control to the next digit. When all thedigits have been adjusted press E to return to the‘CodE’ prompt in the configuration menu. Therevised security code will be activated when theindicator is returned to the display mode.

Please contact BEKA associates sales departmentif the security code is lost.

6.11 Reset to factory defaults: ‘rSEt’This function enables the indicator and thelineariser to be quickly returned to the factorydefault configurations shown in sections 6.0 and7.3

To reset the indicator or lineariser select ‘rSEt’ fromthe configuration menu and press P, the indicatorwill display one of the reset options ‘ConF’ or‘LtAb’.

‘ConF’ Resets the indicator only to defaults‘LtAb’ Resets the lineariser only to defaults

Using the or push button select the requiredsub-function and press P. To prevent accidentalresetting the request must be confirmed byentering ‘5urE’. Using the button set the firstflashing digit to ‘5’ and press P to transfer controlto the second digit which should be set to ‘u’.When ‘5urE’ has been entered pressing the Ebutton will reset the selected configuration menusand return the display to the ‘rSEt’ function in theconfiguration menu.

6.12 Under and over-rangeIf the numerical display range of the indicator isexceeded, all the decimal points will flash asshown below:

BA307NE BA327NEUnderrange -9.9.9.9 -9.9.9.9.9Overrange 9.9.9.9 9.9.9.9.9

Although not guaranteed, most indicators willcontinue to function normally with an input currentbetween 1.8mA and 4mA, at lower currents theinstrument will display ‘LPLo’ before it stopsfunctioning.

Under or overrange of the BA327NE bargraph isindicated by an activated arrow at the appropriateend of the bargraph and a flashing bargraph scale.

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7. LINEARISERA sixteen segment, seventeen breakpoint (0 to 16)lineariser may be selected in the ‘FunC’ section ofthe configuration menu. The starting point andslope of each straight line segment are fullyadjustable allowing the indicator to display mostnon-linear process variables in linear engineeringunits. Each break-point must occur at a currentgreater than the preceding break-point and lessthan the following break-point, in the range 3.8 to21.0mA. If this requirement is not observed whenconfiguring the lineariser the indicator will display'FaiL' and the configuration adjusted whichproduced the error message will be ignored. Fig 9shows a typical linearised indicator characteristic.

Fig 9 shows a typical linearising characteristic

Selecting ‘Lin’ in the ‘FunC’ section of theconfiguration menu activates the lineariser, thisdoes not change the configuration menu shown inFig 8, but the 'CAL' and 'SEt' functions areextended as shown in Fig 10. As with a linearindicator, calibration of the lieariser may beperformed with an external current source usingthe 'CAL' function, or with the internal referenceusing the 'SEt' function.

The lineariser calibration is retained irrespective ofhow the indicator function ‘FunC’ is subsequentlychanged. It is therefore possible to select anddeselect the lineariser without having toreconfigure it each time.

The lineariser calibration may be reset to thefactory default settings without changing theindicator configure uing the 'LtAb' functiondescribed in section 6.11.

7.1 Lineariser calibration using an external current source.

This method allows direct calibration of thelineariser with an external current source and is thepreferred method when traceability is required. Ifthe exact system non-linearity is unknown, thismethod also allows direct calibration from thevariable to be displayed. e.g. the output from alevel sensor in an irregular tank may be displayedin linear volumetric units by filling the tank withknown incremental volumes and calibrating theindicator to display the sum of the increments ateach break-point.

The number of break-point required should first beentered using the 'Add' and 'dEL' functions. Inboth these sub-functions the indicator initiallydisplays the current break-point and the totalnumber of break-points being used as shownbelow.

Display Description of function

'Add' Add a break-pointAdds a new break-point before thedisplayed break-point. The calibrationof existing break-points is not changed,but the identification number of allsubsequent break-points is increasedby one.

'dEL' Remove a break-pointRemoves the displayed break-point andjoins the preceding break-point to thefollowing break-point with a straightline. The identification number of allsubsequent break-points is decreasedby one.

To add a break-point use the or button toselect 'CAL' from the configuration menu and pressP which will result in the 'Add' sub-function promptbeing displayed. To enter the sub-function press Pwhich will reveal the current break-point and thetotal number of break-points which have alreadybeen entered. When adding a break-point to acalibrated indicator, the insertion position for thenew segment can be selected using the and push buttons. Each subsequent operation of theP push button will introduce an additional break-point up to the maximum of 'n:16'.

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17

CAUTIONWhen adding break-points to a new indicator,or following resetting of the lineariser to thefactory defaults using the 'LtAb' functiondescribed in section 6.11, new break-pointsshould be added between the two defaultbreak-points '0:1' and '1:1'. If new break-points are added before breakpoint '0:1' whichhas a default setting of 4mA, it will result in a'FaiL' error message when the indicatordisplay is entered.

The delete break-point sub-function 'dEL' operatesin exactly the same way as the 'Add' sub-functiondescribed above. Once within the ‘dEL’ sub-function each time the P button is pressed a break-point is removed. When deleting a break-point froma calibrated indicator, the break-point to be deletedcan be selected using the and push buttons.The minimum number of break-point is 2, break-points '0:1' and '1:1'.

When the required number of linearising break-points has been entered, return to the linearisationsub-menu by pressing E. The indicator will displaythe 'Add' or 'dEL' prompt depending upon the lastfunction used. Using the 'Pts' sub-function theinput current at which each break-point occurs andthe corresponding indicator display may now bedefined.

Using the or button select the 'PtS' functionin the sub-menu and press P to enter the functionwhich will display the first break-point '0 : n', wheren is the total number of linearising break-pointsentered – see Fig 9. The selected linearisingbreak-point can be changed using the and buttons. When the required linearising break-pointhas been selected set the indicator input current tothe exact value at which the break-point is requiredand press P*. Using the and buttons andthe P button to move between digits, enter therequired indicator display at this break-point.

When set as required, press the E push button toenter the required indicator display and return tothe sub-menu from which the next beak-point canbe selected. * Note: The indicator input current must beadjusted to the required value before the P buttonis operated to enter the required indicator display.

Error messageIf during calibration the indicator displays a'FAiL' error message the current at which theselected break-point is being set is not abovethe proceeding break-point or is not below thefollowing break-point.

When all the break-points have been calibratedpressing E twice will return the indicator to the‘CAL’ function in the configuration menu.

7.2 Lineariser calibration using the internal reference.The ‘SEt’ function enables the lineariser to becalibrated without the need for an accurateexternal current source. Throughout the calibrationthe indicator input current may be any valuebetween 4 and 20mA.

The ‘SEt’ functions contains four sub-functions.

Display Description of function

'Add' Add a break-pointAdds a new break-point before thedisplayed break-point. The calibrationof existing break-points is not changed,but the identification number of allsubsequent break-point is increased byone.

'dEL' Remove a break-pointRemoves the displayed break-pointand joins the preceding segment to thefollowing segment with a straight line.The identification number of allsubsequent break-points is decreasedby one.

'in' Defines the current at which break-point occurs.Enables the required current at eachbreak-point to be defined withouthaving to input an accurate inputcurrent to the indicator.

'diSP' Defines indicator display at break-point.Enables the indicator display at eachbreak-point to be defined.

The number of break-point required should first beentered using the 'Add' and 'dEL' sub-functions.In both these sub-functions the indicator initiallydisplays the current break-point and the totalnumber of break-point being used as shown below.

To add a break-point using the or buttonselect 'SEt' from the configuration menu and pressP which will result in the 'Add' sub-function promptbeing displayed. To enter the sub-function press Pwhich will reveal the current break-point and thetotal number of break-point which have alreadybeen entered. Each subsequent operation of theP push button will introduce an additional break-

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point up to the maximum of 'n:16'. When adding abreak-point to a calibrated indicator, the insertionposition for the new segment can be selectedusing the and push buttons.

CAUTIONWhen adding break-points to a new indicator,or following resetting of the lineariser to thefactory defaults using the 'LtAb' functiondescribed in section 6.11, new break-pointsshould be added between the two defaultbreak-points '0:1' and '1:1'. If new break-points are added before breakpoint '0:1' whichhas a default setting of 4mA, it will result in a'FaiL' error message when the indicatordisplay is entered.

The delete break-point, sub-function 'dEL' operatesin exactly the same way as the 'Add' sub-functiondescribed above. Once within the ‘dEL’ functioneach time the P button is pressed a break-point isremoved. When deleting a break-point from acalibrated indicator, the break-point to be deletedcan be selected using the and push buttons.The minimum number of break-point is 2, break-points '0:1' and '1:1'.

When the required number of linearising break-point has been entered, return to the linearisationsub-menu by pressing E. The indicator will displaythe 'Add' or 'dEL' prompt depending upon the lastsub-function used. The indicator input current andcorresponding indicator display at each break-point, which is the segment finishing point asshown in Fig 8, can now be entered using the ‘in’and ‘diSP’ sub-functions.

Using the or button select 'in' from the sub-menu and press P which will reveal the startingpoint for the first segment '0:n', where n is the totalnumber of break-point entered. Press P and usethe and buttons and the P button to movebetween digits, to enter the input current inmilliamps at which the first break-point is required,usually 4.000mA. When set as required, press Eto return to the ‘0 : n’ prompt from which the nextbreak-point can be selected using the and buttons. When the required break-point has beenselected press P and set the indicator input currentat this break-point. Repeat this procedure until theindicator input current at all the break-points hasbeen defined and then return to the ‘in’ sub-function by pressing the E button.

The corresponding indicator display at each of thebreak-points can now be defined using the ‘diSP’sub-function Using the and buttons selectthe ‘diSP’ sub-function and press P which willreveal the starting point for the first break-point'0:n', where n is the total number of break-pointsentered. Press P and use the and buttonsand the P button to move between digits, to enter

the required indicator display at the first break-point. When set as required, press E to return tothe ‘0 : n’ prompt from which the next break-pointcan be selected using the or buttons. Whenthe required break-point has been selected pressP and set the required indicator display at thisbreak-point.

Repeat this procedure until the indicator display atall the break-points has been defined and thenreturn to the ‘SEt’ function in the configurationmenu by pressing the E button twice.

7.3 Lineariser error messageIf an attempt is made to position a break-point at acurrent which is not greater than the current of thepreceding break-point, or at a current which is notless than the current of the following break-point,the error message ‘FAiL’ will be displayed. Thiserror message will also be displayed if an attemptis made to position a break-point outside thecurrent range 3.8 to 21.0mA.

7.4 Under and over-rangeThe lineariser does not change the under andover-range indication described in section 6.12. Atinput currents below that specified for the firstbreak-point '0:n', the indicator will continue to usethe specified slope of the first segment. Althoughnot guaranteed, most indicators will continue tofunction normally with an input current between1.8mA and 4mA, at lower currents the instrumentwill display ‘LPLo’ before it stops functioning.

At input currents above that specified for the lastbreak-point 'n:n', the indicator will continue to usethe slope specified for the last lineariser segment.

7.5 Lineariser default configurationWhen the lineariser is reset to the factory defaultsusing the ‘LtAb’ function described in section 6.11,the defaults conditions are:

Indicator display BA307NE BA327NE

First break-point '0:1' 4mA 0.0 0.00Second break-point '1:1' 20mA 100.0 100.00

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8. MAINTENANCE

8.1 Fault finding during commissioningIf an indicator fails to function duringcommissioning the following procedure should befollowed:

Symptom Cause SolutionNo display Incorrect wiring Check wiring

There should be0.6 to 1.2V

between terminals1 & 3 with terminal

1 positive.

With an optionalbacklight which is

loop powered,there should be

3.4 to 5V betweenterminals 3 & 12with terminal 12

positive. No display,0V between terminals 1 & 3.

Incorrect wiringor no power

supply.

Check supplyvoltage andvoltage drop

caused by all theinstruments in the

loop.All decimal points flashing.

Underrange if –ve sign

displayed oroverrange.

Recalibrate theindicator to reduce

the maximumdisplay.

Unstable display 4/20mA input isnoisy.

Reduce noise on4/20mA input

and/or decreaseindicator

resolution.Unable to enter configuration menu.

Incorrectsecurity code

entered.

Enter correctsecurity code, orcontact BEKA if

the code has beenlost.

8.2 Fault finding after commissioningThe IEC guidance on maintenance proceduresBS EN 60079-17:2014 Electrical installationsinspection and maintenance permits livemaintenance in Zone 2 if a risk analysisdemonstrates that this does not introduce anunacceptable risk. The removal of covers [openingof Ex n panel enclosure in which the indicator ismounted] is permitted if this can be done withoutcontaminating the interior of the instrument withdust or moisture. Some end-users may prefer notto permit live maintenance to minimise risk.

ENSURE PLANT SAFETY BEFORESTARTING MAINTENANCE

Live maintenance within the hazardousarea should only be performed when it ispermitted by risk analysis or when thereis no risk of a flammable atmospherebeing present.

If an indicator fails after it has been functioningcorrectly, follow the procedure shown in section8.1. If this does not reveal the cause of the fault, itis recommended that the instrument is replaced.

8.3 ServicingAll BA307NE and BA327NE loop poweredindicators are interchangeable if the requiredoptional backlight and alarms are fitted. A singlespare instrument may quickly be recalibrated toreplace any instrument that is damaged or fails.No attempt should be made to repair instrumentsat component level.

We recommend that faulty instrumentsare returned to BEKA associates or toyour local BEKA agent for repair.

8.4 Routine maintenanceThe mechanical condition of the instrument andelectrical calibration should be regularly checked.Inspection frequency should be chosen to suit theenvironmental conditions.

8.5 GuaranteeIndicators which fail within the guarantee periodshould be returned to BEKA associates or yourlocal BEKA agent. It is helpful if a brief descriptionof the fault symptoms is provided.

8.6 Customer commentsBEKA associates is always pleased to receivecomments from customers about our products andservices. All communications are acknowledgedand whenever possible, suggestions areimplemented.

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9. ACCESSORIES

9.1 Scale cardBoth models have a window on the right hand sideof the display through which to view a scale cardshowing the units of measurement such as oC,mBar or RPM. New indicators are fitted with ascale card showing the units of measurementspecified when the indicator was ordered, if theunits are not specified a blank scale card will befitted. A pack of scale cards pre-printed withcommon units of measurement is available as anaccessory. These can easily be fitted to theindicator on-site without opening the indicatorenclosure or removing it from the panel enclosure.See section 5.5 of this instruction manual.

Less common units of measrement can be handprinted onto the scale card using a variety oftechniques, or custom printed cards are availablefrom BEKA.

9.2 Tag informationNew indicators can be supplied with tag orapplication information laser etched onto the rearof the instrument. This tag information is notvisible from the front of the instrument afterinstallation.

9.3 Stainless steel support plateWhen a BA307NE or BA327NE indicator isinstalled into an enclosure panel less than 1mmthick or in a non-metallic enclosure panel, asupport plate may be required as explained insection 5.2c of this manual. This plate preventsthe enclosure panel being distorted or creepingwhen the indicator panel clamps are tightened andensures that the joint between the indicator and thepanel enclosure in which it is mounted remainssealed.

9.4 Alarms

CAUTIONThese alarms outputs should not be used forcritical safety applications such as anemergency shut down system.

Both models can be supplied with factory fitteddual solid state, single pole alarm outputs. Eachalarm output may be independently conditioned asa high or low alarm with a normally open ornormally closed output in the non-alarm condition.

When the 4/20mA current powering the indicator isremoved both alarm outputs will open irrespectiveof configuration. The open circuit condition shouldtherefore be chosen as the alarm condition whendesigning an alarm system. Fig 11 illustrates theconditions available and shows which are fail safe.

When an alarm occurs an alarm annunciator onthe indicator's front panel is activated and ifrequired the numerical display can alternatebetween the measured value and the alarmchannel identification ‘ALr1’ or ‘ALr2’.

CAUTIONThe alarms are activated by the indicator’snumerical display. Use of the Tare Function‘tArE’ will change the numerical display, thealarms will continue to function at the originaldisplayed value, but this will correspond to adifferent input current.

Fig 11 Alarm outputs

Configurable functions for each alarm includeadjustable setpoint, hysteresis, alarm delay andalarm accept.

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9.4.1 Solid state output Each alarm output is a galvanically isolated singlepole solid state switch as shown in Fig 12. Theoutput is polarised and current will only flow in onedirection, terminals 8 and 10 should therefore beconnected to the positive side of the circuit beingswitched.

Ron = less than 5Ω + 0.7VRoff = greater than 1MΩ

Fig 12 Equivalent circuit of each alarm output

9.4.2 Type nA certificationEach alarm output is a separate galvanicallyisolated Ex nA circuit with the following inputparameters:

Ui = 30V dcIi = 200mA

This allows each alarm output to switch any dccircuit providing that in normal operation themaximum supply voltage is not greater than 30Vdc and the switched current is not greater than200mA.

Providing that the BA307NE or BA327NE indicatoris correctly installed in a panel enclosure located inZone 2 complying with the requirements for Ex nprotection, the two alarm outputs may be used toswitch suitably protected equipment located in anyZone of a hazardous area, or equipment located ina safe area..

Fig 13 shows a typical application in which aBA307NE or BA327NE indicator mounted in anEx n panel enclosure located in Zone 2 isdisplaying the output from an Flameproof Ex d2-wire transmitter located in Zone 1. Alarm 1 isswitching an Ex e sounder in Zone 1 and alarm 2 isswitching a sounder located in the safe area.

Fig 13 Typical alarm application(Shown without recommended screened cables)

To comply with the requirements ofBS EN 60079-14 Electrical installations design,selection and erection, each of the wires enteringthe hazardous area should be individually fusedand contain a means of isolation. These tworequirements are frequently satisfied by using fuseholders with easily removable fuses and removingthe fuses to achieve isolation. This is asatisfactory method at the low voltages andcurrents common in instrumentation systems.Clear identification of, and easy access to themeans of isolation is essential for their effectiveuse. It is also necessary to ensure that themaintenance procedure makes sure thatunauthorised re-closure of the switches does notoccur. It is not considered necessary to have ameans of isolation or electrical protection for thescreen. Figure 20 illustrates an example of thistype of switch fuse terminal block.

For some application Ex nA instrumentationenergised by a current limited power supply orinstrument that can be switched off, is oftenconsidered adequate and to comply with therequirements of the standard.

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9.4.3 Configuration and adjustmentWhen optional alarms are fitted to a loop poweredindicator the configuration menu is extended asshown in Fig 12. The additional functions appearbetween the ‘SEt’ and the ‘C- - P’ functions for theBA307NE and between ‘bAr’ and ‘C- -P’ for theBA327NE indicator. For simplicity, Fig 12 onlyshows the additional functions for alarm 1, butalarm 2 has identical functions.

The following table summaries each of the alarmconfiguration functions and includes a crossreference to more detailed information.

Summary of alarm configuration functions

Display Description of function

'EnbL’ Alarm enableEnables or disables the alarm withoutchanging the alarm parameters.See section 9.4.4

'SP1' Alarm setpoint 1Adjusts the alarm setpoint. The alarmis activated when the indicator displayequals the setpoint.See section 9.4.5

'Hi.Lo' Alarm functionDefines the alarm function as High orLow.See section 9.4.6

'no.nC' Normally open or normally closedoutputSets the alarm output open or closed inthe non-alarm condition.See section 9.4.7

'HStr' HysteresisAdjusts the alarm hysteresis.See section 9.4.8

'dELA' Alarm delay timeIntroduces adjustable delay betweenthe display equalling the setpoint andthe alarm output being activated. See section 9.4.9

'SiL' Alarm silence timeDefines the time that the alarm outputremains in the non-alarm conditionfollowing acceptance of an alarm.See section 9.4.10

‘FLSH’ Flash display when alarm occursWhen enabled, alternates thenumerical display between processvalue and alarm reference, ‘ALr1’ or‘ALr2’, when an alarm output isactivated. See section 9.4.11

'ACSP' Access setpointSub-menu which enables direct accessto the alarm setpoints from the indicatordisplay mode, and defines a separatesecurity code.See section 9.4.12

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9.4.4 Alarm enable: ‘EnbL’This function allows each alarm to be enabled ordisabled without altering any of the alarmparameters. To enable or disable the alarm select'EnbL' from the alarm menu and press P which willreveal the current setting ‘on’ or ‘oFF’. Thefunction can be changed by pressing the or button followed by the E button to return to thealarm menu.

9.4.5 Setpoint adjustment: ‘SP1’ and ‘SP2’The setpoint of each alarm may be positionedanywhere in the numerical display of the indicatorproviding that this corresponds to an input currentbetween 3.8 and 20.2mA. e.g. If the indicator hasbeen calibrated to display 0 with 4mA input and10000 with 20mA input, the two alarm setpointsmay be positioned anywhere between -125 and10125. To adjust the setpoint select 'SP1' or 'SP2' from thealarm configuration menu and press P which willreveal the existing alarm setpoint. The flashingdigit of the setpoint can be adjusted using the and push buttons, and the P button to movecontrol to the next digit. When the requiredsetpoint has been entered press E to return to thealarm configuration menu.The alarm setpoints may also be adjusted whenthe indicator is in the display mode, see section9.4.12.

9.4.6 Alarm function: ‘Hi.Lo’Each alarm can be independently conditioned as ahigh alarm or as a low alarm. To check or changethe alarm function select 'Hi.Lo' from the alarmmenu and press P to reveal the current setting.The function can be changed by pressing the or button followed by the E button to return to thealarm menu.

9.4.7 Alarm output status: ‘no.nC’Configures the solid state alarm output to be open‘no’ or to be closed ‘nC’ in the non-alarm condition.When deciding which is required, care should betaken to ensure that the alarm output is fail safe asillustrated in Fig 9.

‘no’ Alarm output open in non-alarm condition

‘nC’ Alarm output closed in non-alarm condition

CAUTIONWhen the 4/20mA supply is removed from theloop powered indicator, both alarm outputswill open irrespective of conditioning.Therefore for fail safe operation both alarmoutputs should be conditioned to be open inthe alarm condition ‘nC’.

To check or change the alarm output status, select'no.nC' from the alarm configuration menu andpress P to reveal the setting. The function may bechanged by pressing the or button followedby the E button to return to the alarm configurationmenu.

9.4.8 Hysteresis: HStrHysteresis is shown in the units that the indicatorhas been calibrated to display.To adjust the hysteresis select 'HStr' from thealarm menu and press P which will reveal theexisting figure. The flashing digit can be adjustedusing the and push buttons, and the Pbutton will move control to the next digit. When therequired hystersis has been entered press E toreturn to the alarm configuration menu.

e.g. An indicator calibrated to display 0 to 10000,with a high alarm set at 9000 and hysteresis of 200will perform as follows:

The high alarm will be activated whenincreasing indicator display equals 9000, butwill not reset until the indicator display fallsbelow 8800.

9.4.9 Alarm delay: dELAThis function delays activation of the alarm outputfor an adjustable time following the alarm conditionoccurring. The delay can be set in 1 secondincrements between 0 and 3600 seconds. If adelay is not required zero should be entered. Toadjust the delay select 'dELA' from the alarmconfiguration menu and press P which will revealthe existing delay. The flashing digit of the delaycan be adjusted using the and push buttons,and the P button to move control to the other digits.When the required delay has been entered pressE to return to the alarm menu.

e.g. An indicator with a high alarm set at 9000 andan alarm delay of 30 seconds will perform asfollows:

The alarm annunciator will start to flash when anincreasing indicator display equals 9000, but thealarm output will not be activated until the alarmcondition has existed continuously for 30 seconds.When the alarm output is activated, the alarmannunciator will stop flashing and becomepermanently activated.

If the ‘FLSH’ function, which flashes the indicatordisplay when an alarm occurs, has been enabled,it will not start to function until the alarm output isactivated. See section 9.4.11

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9.4.10 Alarm silence time: SiLThis function is primarily intended for use in smallinstallations where the alarm output directlyoperates an alarm annunciator such as a sounderor beacon. When the alarm silence time, which isadjustable between 0 and 3600 seconds in 1second increments, is set to any figure other thanzero, the P push button becomes an alarm acceptbutton. After an alarm has occurred, operating theP button will cause the alarm output to revert to thenon-alarm condition for the programmed alarmsilence time. If the alarm condition still exists atthe end of the silence time, the alarm output will bereactivated. During the silence time the indicatoralarm annunciator will flash until the silence timeexpires or the alarm is cleared.

If the ‘FLSH’ function, which flashes the indicatordisplay when an alarm occurs has been enabled,it will only function when the alarm output isactivated, not during the silence time. See section9.4.11

To adjust the alarm silence time select 'SiL' fromthe alarm configuration menu and press P whichwill reveal the existing silence time. The flashingdigit of the silence time can be adjusted using the and push buttons, and the P button to movecontrol to the other digits. When the requiredsilence time has been entered press E to return tothe alarm menu.

9.4.11 Flash display when alarm occurs ‘FLSH’In addition to the two alarm annunciators on thetop left hand corner of the indicator display whichshow the status of both alarms, this functionprovides an even more conspicuous indication thatan alarm condition has occurred.

When enabled, the function alternates the indicatordisplay between the numerical value and the alarmreference, ‘ALr1’ or ‘ALr2’, when the alarm outputis activated. If both alarm outputs are activated,the alarm references are displayed in sequence.

To enable or disable the function select 'FLSH'from the alarm menu and press P which will revealthe current setting ‘on’ or ‘oFF’. The function canchanged by pressing the or button followedby the E button to return to the alarm menu.

9.4.12 Access setpoint in display mode: ACSPThis function enables a separate menu providingaccess to the alarm setpoints from the displaymode by simultaneously operating the P and push buttons. An operator can therefore adjust thealarm setpoints without having access to theindicator configuration menu. Protection againstaccidental adjustment of the setpoints when the

indicator is in the display mode is provided by aseparate security code.

This direct setpoint access menu is enabled andthe separate security code entered from the'ACSP' function in the alarm configuration menu asshown in Fig 12. To change the menu parametersselect 'ACSP' from the configuration menu andpress P which will display the enable prompt'EnbL'. Press P again to reveal if the direct accessmenu is 'on' or 'oFF'. The or button willtoggle the display between the two conditions.

If 'oFF' is selected, the operator will not haveaccess to the setpoints from the display mode.Return to the 'ACSP' prompt in the main menu bypressing E twice.

If 'on' is selected, the operator will have directaccess to the alarm setpoints from the displaymode via a separate optional security code. Todefine this four digit security code press P to returnto the 'Enbl' prompt followed by the or buttonto select the access code prompt 'ACCd'.Pressing P will reveal the current security code.Each digit of the code may be changed byoperating the and push buttons, and the Pbutton to move control to the next digit. When therequired code has been entered, press E twice toreturn to the 'ACSP' prompt in the configurationmenu.

Default code 0000 will disable the security codeallowing direct access to the setpoints in thedisplay mode by pressing the P and buttonssimultaneously. Unless otherwise requested newinstruments with alarms are supplied with thisfunction disabled and the security code set to0000.

9.4.13 Adjusting alarm setpoints from the display modeAccess to the alarm setpoints from the indicatordisplay mode is obtained by operating the P and push buttons simultaneously as shown in Fig 15. Ifthe setpoints are not protected by a security codethe alarm setpoint prompt 'SP1' will be displayed.If the setpoints are protected by a security code,'Code' will be displayed first. Pressing P again willenable the alarm security code to be entered digitby digit using the and buttons to change theflashing digit, and the P push button to movecontrol to the next digit. If the correct code isentered pressing E will cause alarm setpointprompt 'SP1' to be displayed. Pressing the or button will toggle the display between the twoalarm setpoint prompts 'SP1' and 'SP2'.

If an incorrect security code is entered, or a buttonis not pressed within twenty seconds, the indicatorwill automatically return to the display mode.

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Fig 15 Setpoint adjustment from the display mode

To adjust an alarm setpoint select 'SP1' or 'SP2'and press P which will reveal the current setting.Each digit of the setpoint may be adjusted usingthe and push buttons, and the P button tomove control to the next digit. When the requiredsetpoint has been entered, pressing E will returnthe display to the 'SP1' or 'SP2' prompt from whichthe other setpoint may be selected, or the indicatormay be returned to the display mode by pressing Eagain.

Note: With the indicator in the display mode, directaccess to the alarm setpoints is only availablewhen the ACSP menu is enabled - see section9.4.12

9.4.14 Displaying setpoints on BA327NE bargraphOne of the selectable bargraph formats ‘AlrSP’allows a low or a high setpoint plus the displayedvalue to be represented, or a low and a highsetpoint plus the displayed value to be representedby the bargraph as shown in Fig 16.

Fig 16 Displayed value and setpoints on bargraph

The bargraph area below the low alarm setpointand the area above the high alarm setpoint areactivated. The displayed variable is representedby an activated bar which moves between theselow and high alarm setpoints.

When the activated bar representing the displayedvariable is adjacent to the area representing thelow or high alarm setpoints, the bar flashes.When a displayed variable equals the low or highalarm the complete bargraph representing theactivated alarm flashes irrespective of whether thealarm output has been delayed or cleared.

For this function to operate SP1 must beconditioned as a low alarm and SP2 as a highalarm; SP1 must always be less than SP2.Incorrect configuration is shown by a flashingbargraph scale with no activated bars.

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9.5 Display backlightThe BA307NE and BA327NE loop poweredindicators can be supplied with a factory fittedbacklight that may be loop or separately powered.

When loop powered the backlight produces greenbackground illumination enabling the display to beread at night or in poor lighting conditions. Noadditional power supply or field wiring are required,but the indicator voltage drop is increased. Whenseparately powered the backlight is brighter, butadditional field wiring is required.

Fig 17 Terminals for optional backlight

9.5.1 Loop powering the backlightThe backlight is loop powered by connecting it inseries with the indicator’s 4/20mA input as shownin Fig 18, which increases the maximum indicatorvoltage drop from 1.2 to 5V.

Fig 18 Loop powered backlight

9.5.2 Separately powering the backlightThe optional backlight may also be powered from aseparate power supply as shown in Fig 19.

Fig 19 Separately powered backlight

The separately powered backlight is a current sinkwhich will draw a constant 22.5mA when thesupply voltage is equal to or greater than 9V. Atlower supply voltages the backlight will continue tofunction but with reduced brilliance and will drawless current.

The ATEX certificate therefore only specifies themaximum safety input voltage Ui for terminals 12and 14.

Ui = 30V

To comply with the requirements ofBS EN 60079-14 Electrical installations design,selection and erection, each of the wires enteringthe hazardous area should be individually fusedand contain a means of isolation. These tworequirements are frequently satisfied by using fuseholders with easily removable fuses and removingthe fuses to achieve isolation. This is asatisfactory method at the low voltages andcurrents common in instrumentation systems.Clear identification of, and easy access to themeans of isolation is essential for their effectiveuse. It is also necessary to ensure that themaintenance procedure makes sure thatunauthorised re-closure of the switches does notoccur. It is not considered necessary to have ameans of isolation or electrical protection for thescreen. Figure 20 illustrates an example of thistype of switch fuse terminal block.

For some application Ex nA instrumentationenergised by a current limited power supply thatcan be switched off, is often considered adequate.

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APPENDIX 1Use in an Ex e or Ex p panel enclosure locatedin Zone 2.The ATEX and IECEx certificates for the BA307NEand BA327NE indicators permit the instruments tobe installed in an Ex e increased safety panelenclosure located in Zone 2, or in an Ex ppressurised panel enclosure located in a Zone 2hazardous area.

A1.1 Installation in Ex e panel enclosure withinZone 2 Installation of a BA307NE or BA327NE indicator inan Ex e increased safety panel enclosure does notinvalidate the Ex e panel's ingress and impactprotection as the front of both indicators complywith Ex e ingress and impact requirements.Although mounted in an Ex e panel enclosure, theBA307NE or BA327NE remain protected byGroup II Category 3G Ex nA ic IIC T5 Gccertification described in the main section of thismanual and the front panel push button contactsremain intrinsically safe Ex ic.

In normal operation i.e. without faults, themaximum power dissipation within the indicator isless than 150mW which is very unlikely to modifythe internal temperature of the Ex e panelenclosure.

CAUTIONBA307NE and BA327NE indicators shouldnot be installed in an Ex e panel enclosurelocated in Zone 1.

There are four design requirements:

1. The indicator should be installed generally asshown in section 5 and Fig 20.

2. The certificate specifies that the indicatorshould be connected to a limited energy4/20mA circuit having a maximum outputcurrent of 200mA. A low voltage supply,usually 24V, that is safe in normal operationand suitable for live connection i.e. CEmarked, is usually considered acceptable.

3. Wiring should comply with Clause 9 ofBS EN 60079-14.

4. The 4/20mA input must be able to supply the1.2V required to operate the indicator. Thisincreases to 5.0V if the indicator includes anoptional loop powered backlight. See 9.5.1.

Fig 20 Typical installation in Ex e panel enclosure

A1.2 Zone 2 installation in Ex p enclosureInstallation of a BA307NE or BA327NE indicator inan Ex p pressurised panel enclosure does notinvalidate the pressurised panel's ingress andimpact protection as the front of the indicatorcomplies with Ex p ingress and impactrequirements. Although mounted in an Ex p panel,enclosure the BA307NE or BA327NE remainprotected by Group II Category 3G Ex nA ic IIC T5Gc certification described in the main section ofthis manual and the front panel push buttoncontacts remain intrinsically safe Ex ic.

CAUTIONBA307NE and BA327NE indicators shouldnot be installed in an Ex p panel enclosurelocated in Zone 1.

Fig 21 Typical installation in Ex p panel enclosure

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A1.3 Installation in an Ex p panel enclosure within Zone 2. Fig 21 shows a typical installation within an Ex ppressurised enclosure located in Zone 2.

The BA307NE and the BA327NE may be drivendirectly from any instrument with a 4/20mA outputlocated in the safe area or from apparatus locatedwithin the Ex p panel enclosure.

There are five design requirements:

1. The indicator must be installed in the panel ofan Ex p enclosure generally as shown insection 5 of this manual and in Fig 21.

2. The four vents at the rear of the indicatorenclosure shown in Fig 22 must not beobstructed.

3. The certificate specifies that the indicatorshould be connected to a limited energy4/20mA circuit having a maximum outputcurrent of 200mA. An instrument located inthe safe area that is safe in normal operationand has a 4/20mA output suitable for liveconnection i.e. CE marked, is usuallyconsidered acceptable.

4. Wiring should comply with Clause 9 ofBS EN 60079-14:2008.

5. The 4/20mA input must be able to supply the1.2V required to operate the indicator. Thisincreases to 5.0V if the indicator includes anoptional loop powered backlight. See 9.5.1

Fig 22 Position of rear vents

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APPENDIX 2ATEX dust certificationIn addition to ATEX certification permittinginstallation in Zone 2 gas atmospheres which isdescribed in the main section of this instructionmanual, the BA307NE and the BA327NE alsohave ATEX Ex tc certification, allowing installationin Zone 22 combustible dust atmospheres whenmounted in an Ex t panel enclosure.

A2.1 Zones and Maximum SurfaceTemperature

Both indicators have been certified as Group IICategory 3D Ex tc IIIC T80°C Dc IP20 apparatuswith a Ta of –40°C to +70C. This is dust ignitionprotection by enclosure complying withBS EN 60079-31 Equipment dust ignitionprotection by enclosure "t".

When mounted in an Ex t panel enclosure asspecified in section 5 of this instruction manual andcomplying with the installation requirements ofBS EN 60079-14 the indicators may be installed in:

Zone 22 explosive atmosphere in the form ofa cloud of combustible dust in air isnot likely to occur in normaloperation, but if it does occur, willonly persist for a short period.

Be used with dusts having a Minimum Ignition Temperature of:

Dust cloud 120°C

Dust layer on indicator 155°Cup to 5mm thick. *

Dust layer on indicator Refer toover 5mm thick. * BS EN 60079-14

At an ambient temperature between -40 and +70°C

* Unlikely occurrence in Zone 22

A2.2 Installation All the circuits shown in the main section of thismanual for indicator installations in Zone 2flammable gas atmospheres, may also be used forZone 22 combustible dust applications. Theindicator should be installed in an Ex t panelenclosure located within Zone 22. The panelenclosure containing the indicator should belocated where the minimum amount of dust willaccumulate on them and the installation should beas specified in section 5 of this instruction manualand comply with the requirements of EN 60079-14.

BS EN 60079-14 requires that each of the wiresentering the hazardous area should be individuallyfused and contain a means of isolation. However,in practice instrumentation energised by a currentlimited power supply that can be switched off isoften considered adequate.

A2.3 MaintenanceThe BA307NE and BA327NE front panel keypadsare intrinsic safe Ex ic which allows them to beoperated in Zone 22.

The IEC guidance on maintenance proceduresEN 60079-17 permits live maintenance in Zone 22if a risk analysis demonstrates that this does notintroduce an unacceptable risk. The removal ofcovers [opening of Ex tc enclosure] is permitted ifthis can be done without contaminating the interiorof the enclosure and instrument with dust ormoisture. Some end-users may prefer not topermit live maintenance to minimise risk.

ENSURE PLANT SAFETY BEFORESTARTING MAINTENANCE

Live maintenance within the hazardousarea should only be performed when it ispermitted by risk analysis or when thereis no risk of a flammable atmospherebeing present.

Before closing the Ex tc enclosureensure that the sealing gaskets areundamaged and free from dirt andforeign bodies.

Inspection of the indicator’s mechanical conditionand removal of accumulated dust from the front ofthe indicator and the outside of the Ex tc enclosureshould be performed regularly. The intervalbetween inspections depends upon environmentalconditions. Removal of flammable dust should beperformed with care to avoid creating a dust cloud.

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APPENDIX 3IECEx gas and dust certificationIECEx is a global certification scheme for explosionprotected products which aims to harmoniseinternational certification standards. For additionalinformation about the IECEx certification schemeand to view the BEKA associate certificates, pleasevisit www.iecex.com

A3.1 IECEx Certificate of ConformityThe BA307NE and the BA327NE loop poweredindicators and the optional accessories have beenissued with an IECEx Certificate of Conformitynumber IECEx ITS 14.0026X that specifies thefollowing certification codes:

Ex nA ic IIC T5 GcEx tc IIIC T80°C Dc IP66Ta = -40°C to 70°C

The specified gas and dust safety parameters areidentical to the ATEX safety parameters describedin the main section and Appendix 1 and 2 of thismanual.

The IECEx certificate may be downloaded from theBEKA associates website www.beka.co.uk, fromthe IECEx website www.iecex.com or requestedfrom the BEKA sales office.

A3.2 InstallationThe IECEx and ATEX certificates specify identicalsafety parameters and installation requirements forboth indicators. The ATEX installationrequirements specified in the main section of thismanual and in Appendix 1 & 2 may therefore beused for IECEx installations which should complywith IEC 60079-14 Electrical installations design,selection and erection. The local code of practiceshould also be consulted.

APPENDIX 4

ETL & cETL certification for installations inUSA and Canada.

A4.0 cETL MarkFor installations in the USA and Canada, theBA307NE and BA327NE indicators have ETL andcETL Ex nA and Ex tc approval, Control Number4008610. Copies of the Authorisation to Mark maybe downloaded from the BEKA associates websitewww.beka.co.uk or requested from the BEKAassociates sales office

A4.1 ETL and cETL certificationThe US and Canadian standards used forassessment and certification of the BA307NE andBA327NE are listed on the cETL Authorisation toMark.

ETL codes for USAClass I Zone 2 AEx nA ic IIC T5 GcZone 22 AEx ic tc IIIC T80ºC Dc

-40ºC ≤ Ta ≤ 60ºC

cETL codes for CanadaEx nA ic IIC T5 Gc Ex n IIC T5 Gc Ex ic tc IIIC T80ºC Dc Class III Div 2 Class II Div 2 Gp F GTa = -40°C to 60°C

The ETL and cETL safety parameters are thesame as the ATEX and IECEx parameters,therefore the systems shown in the main section ofthis manual and in Appendix 1 may be used for USand Canadian installations subject to complyingwith the local codes of practice.

The Indicator's front panel push button contactsare non incendive and have been certifiedintrinsically safe Ex ic, without the need for anexternal Zener barrier or galvanic isolator. This isthe 'ic' code shown on the instrument's certificationlabel and on the ETL Authorisation to Mark. Thisallows the loop powered indicator to be adjustedand configured live when installed in a Zone 2 or22 hazardous areas. These loop poweredindicators are not intrinsically safe and thereforeexternal Zener barriers or galvanic isolators are notrequired.