dd-23

INSTRUCTION MANUAL FOR DD-23

WARNING

The process medium may be hot or otherwise hazardous. Precautions when removing the sensor from the process line:

Make sure that the process line is not under pressure. Open a vent valve to the at-mosphere. For a retractor/isolation valve the line pressure should be within specifi-cations. For a prism wash system, close a hand valve for the wash medium and disable the wash valve. Loosen the clamp or flange bolts cautiously, be prepared to tighten again. Be out of the way of any possible splash and ensure the possibility of es-cape. Use shields and protective clothing adequate for the process medium. Do not rely on avoidance of contact with the process medium. After removal of the sensor, it may be necessary to mount a blind flange for security reasons.

Document/Revision No. 1.32 Effective: April 7, 2011

This product manual is delivered to the end-user with a K-Patents product. Information in this manual is subject to change without notice. The latest manual version is always available in the Downloads section at http//www.kpatents.com/. You can also contact [email protected]. K-PATENTS OY

Postal address: P.O. Box 77 FI-01511 Vantaa, Finland

Tel. + 358 207 291 570 Fax +358 207 291 577 E-mail: [email protected] http://www.kpatents.com/

K-PATENTS OY

Street address: Elannontie 5 FI-01510 Vantaa, Finland

K-PATENTS, INC.

1804 Centre Point Circle Suite 106 Naperville, IL 60563

Tel. 630-955 1545 Fax 630-955 1585 E-mail: [email protected] http://www.kpatents.com/

Table of contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.2 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 The Divert Control System DD-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.2 Divert control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3 Operator panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.3.2 Green indicator lights: System ok . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.3.3 Yellow indicator lights: Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.3.4 Red indicator lights: Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.3.5 White pushbuttons: Testing and resetting . . . . . . . . . . . . . . . . . . . . . 52.3.6 Header wash key: Enabling ring header wash . . . . . . . . . . . . . . . . . . 62.3.7 Emergency divert button: Manual divert . . . . . . . . . . . . . . . . . . . . . . 62.3.8 External emergency divert button . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.4 Prism wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5 Indicating transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Mounting prism wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.2.1 Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.3 Switch inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.3.1 External divert reset button+mounting . . . . . . . . . . . . . . . . . . . . . . 103.3.2 External Divert switch/push button . . . . . . . . . . . . . . . . . . . . . . . . . 103.3.3 Header wash key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103.4 Remote ethernet connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134.1 Divert system pre-startup checklist . . . . . . . . . . . . . . . . . . . . . . . 134.2 Divert control unit DD-23 startup . . . . . . . . . . . . . . . . . . . . . . . . 14

5 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.1 Calibration lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.2 Divert decision rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165.3 Refractometer concentration measurement . . . . . . . . . . . . . . . 175.4 Refractometer activation for divert control . . . . . . . . . . . . . . . 185.5 Signal difference alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185.6 Low alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.6.1 Solids warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.6.2 Solids alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195.7 Refractometer malfunction alarm . . . . . . . . . . . . . . . . . . . . . . . . . 195.8 Prism wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6 Regular maintenance and troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 216.1 Information flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.2 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.3 Diagnostic tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236.4 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236.4.1 A question mark (?) on the refractometer display . . . . . . . . . . . . . 236.4.2 A refractometer refuses to come on-line . . . . . . . . . . . . . . . . . . . . . . 236.4.3 No lights come up in the Divert Control Unit . . . . . . . . . . . . . . . . . 246.4.4 All lights are blinking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7 Divert control logics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257.1 Safety decision logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257.2 Divert decision logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267.3 In operation logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277.4 Malfunction logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297.5 Resettable alarm logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.6 Refractometer difference logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 317.7 Wash arbitration logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

8 Remote control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338.1 Divert Control Unit IP address . . . . . . . . . . . . . . . . . . . . . . . . . . . 338.2 The remote interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338.2.1 Main page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338.2.2 Instrument pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348.2.3 Diagnostics page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348.2.4 Log page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358.2.5 Parameters page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368.3 Data logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

9 DD-23 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379.1 Divert Control Unit specifications . . . . . . . . . . . . . . . . . . . . . . . . 379.2 Divert control unit spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

A Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

1 Introduction 1

1 Introduction

The K-Patents Digital Black Liquor Divert Control System DD-23 provides a di-vert signal preventing black liquor with dangerously low solids to reach the blackliquor burners. The system is built strictly according to the principles of Recom-mended Good Practice "Safe Firing of Black Liquor in Black Liquor Recovery Boilers"(BLRBAC April 2010; the document is available athttp://www.blrbac.org/Sept2010Updates/Safe_Firing_of_Black_Liquor_April_2010.pdf).The system consists of the following parts: Two K-Patents Process refractometersPR-23-SD (A & B) are installed in series in the main black liquor line. Each re-fractometer is complete with a sensor, an Indicating transmitter and interconnectingcables. Each refractometer provides also two 4–20 mA output signal not used by thedivert control system. These can be used to give % solids output or temperatureoutput signals. The sensors are also equipped with a steam wash nozzles althoughthe self-cleaning sensor design may eliminate the need for prism wash altogether.

Figure 1.1 Complete Digital Black Liquor Divert Control System DD-23

2 DD-23 instruction manual

1.1 WarrantyK-Patents warrants that all products made by K-Patents shall be free of defects inmaterial and workmanship. K-Patents agrees to either replace or repair free of charge,any such product or part thereof which shall be returned to the nearest authorizedK-Patents repair facility within two (2) years from the date of delivery.Before returning a defective product for service or replacement, please contact K-Patentsor your nearest K-Patents representative (see http://www.kpatents.com/ for contactinformation). For the health and safety of personnel handling your return, clean theinstrument, especially the parts that have been in contact with the process liquid,before packing it. Ship the cleaned instrument to the address given to you.

1.2 DisposalWhen disposing of an obsolete instrument or any parts of an instrument, pleaseobserve the local and national requirements for the disposal of electrical and electronicequipment. The aluminium or stainless steel sensor housing can be recycled with othermetallic waste of the same type.

2 The Divert Control System DD-23 3

2 The Divert Control System DD-23

2.1 OverviewThe Divert control system DD-23 includes:

− A Divert Control Unit− Two isolation valves SDI for the refractometers above to allow removal of the

refractometers from a pipe with full flow and pressure. The isolation valve includesa prism wash nozzle and two check valves (one for prism wash, one for stuffingbox flush).

− A roofed mounting plate to mount the two Indicating transmitters and the DivertControl Unit together.

− Wiring to connect the Indicating transmitters with the Divert Control Unit.− Two steam valves with steam traps for prism wash (pneumatic + solenoid valves).− Two hand valves (one for prism wash, one for stuffing box flush).− A remote operator panel facility, accessible with a web browser over Ethernet

Note: BLRBAC (The Black Liquor Recovery Boiler Advisory Committee) recommendsa spare refractometer sensor to be maintained in stock on-site.

2.2 Divert control unitThe Divert Control Unit is contained in an enclosure with the same dimensions asthe refractometer transmitter enclosure. The control unit includes:

− An operator with system state indicators and pushbuttons− Relay outputs for connecting to the control system− Contact inputs for external control− Ethernet interface for remote operator panel

2.3 Operator panelThe operator panel has a clear layout and the operator can see all information atone glance. The divert decision is controlled from the operator panel which providesdoubled security, since information is shown both as LED indication in the Divertcontrol unit and as a diagnostic messages in the Indicating transmitters. The sameinformation is also available through the remote operator panel.


2.3.1 Overview

Red indicatorlights (alarms)

Yellow indicatorlights (warnings)

Green indicatorlights (all well)

White push-buttons

Red push-button

Figure 2.1 DD-23 operator panel

The three top rows on the operator panel consist of indicator lights. The greenA IN OPERATION and B IN OPERATION lights are also push buttons used to include therefractometers in the Divert system. Below the lights there are push buttons and theHEADER WASH key key used to operate the system.The indicator lights on the operator panel are arranged like traffic lights: top row isred for alarm, middle row is yellow for warning and bottom row is green for "systemok". When the system is running normally, only the row of green lights should be lit.The white LIGHT TEST button is used to check that all the LEDs behind the indicatorlights are working. It also verifies the data processing system in the control unit. Theother two white push buttons, ALARM RESET and DIVERT RESET can be used to resetthe system back to normal after all problems have been fixed. The HEADER WASH keyenables the use of ring header washing with water, when set to ON.The big red EMERGENCY DIVERT push button is used to manually initiate divert in anemergency situation. An external push button can also be connected to a switchinput in the control unit as External Emergency divert button, see Section 3.3.1.

2 The Divert Control System DD-23 5

2.3.2 Green indicator lights: System ok

Each refractometer has a green operating light – A IN OPERATION and B IN OPERATION –to let the operator know when he can rely on the refractometer measurement. Arefractometer will only influence the divert decision and activate warnings and alarmswhen it is in divert operation, i.e. when its green operating light is lit.Important: When DIVERT is effective, the system may be reset to normal operationonly when SAFE SOLIDS is lit.

2.3.3 Yellow indicator lights: Warnings

The SOLIDS WARNINGlight indicates a black liquor concentration of below warning limit(by default at 60%). This warning can be activated by either refractometer.The A&B DIFFERENCE light is lit when the refractometer readings differ by at least 2%.This warning will only be initiated if both refractometers are operating.If the yellow MALFUNCTION light is switched on, some part of the system – a refrac-tometer, an indicating transmitter or the control unit – is malfunctioning. A listover malfunctions and critical malfunctions is given in Section 6.2. If a critical mal-function occurs in a sensor or transmitter, the malfunctioning refractometer will beautomatically removed from divert operation (its operating light will also be switchedoff). Check the reason for the malfunction and correct the problem (see Section 6.4)before returning the refractometer back to divert operation.

2.3.4 Red indicator lights: Alarms

The black liquor SOLIDS ALARM is lit when the concentration reading goes below alarmlimit (by default below 58%). This alarm can be activated by either refractometerdepending on the operation rule setting.The DIVERT light will be switched on when the SOLIDS ALARM is activated. The DIVERTlight indicates divert status of the divert relay. The relay is inactive in the divertposition, because then a power failure will give a divert decision signal to the system.The OVERRIDE light is lit to indicate that no automatic divert will happen as longas the system is in the header wash state (see Section 2.3.6).

2.3.5 White pushbuttons: Testing and resetting

The LIGHT TEST button switches all 12 lights on. The ALARM RESET button resets thealarm lights.


2.3.6 Header wash key: Enabling ring header wash

The header wash key function is a 3-level procedure which can be used when ringheader washing with water is needed. When the HEADER WASH key is switched to ONposition and information from black liquor guns switch inputs connected in series tellthat guns are out from recovery boiler, then a ring header wash can be done withoutactivating Divert.Note: Pushing the EMERGENCY DIVERT button will always initiate divert regardless ofthe header wash functionality.

2.3.7 Emergency divert button: Manual divert

The EMERGENCY DIVERT push-button is used to manually initiate divert in an emergencysituation.

2.3.8 External emergency divert button

An external (remote) push button can also be connected to an input inside the Controlunit, see Figure 3.3.Note: External emergency divert button must be normally closed (NC). Opening thecircuit will initiate divert.

2.4 Prism washThe wash parameters for the sensors are set through each transmitter (Section 5.8).The transmitters contain a relay for prism wash. To follow the BLRBAC recommen-dation not to wash both prisms at the same time, the Divert Control Unit implementsan interlock which prevents the instrument from washing both sensors simultaneously.

2.5 Indicating transmittersMechanically the Indicating transmitters shipped with a DD-23 are the same thanPR-23 Indicating transmitter DTR. The transmitter will only allow single sensorconnection and a special DD-23 transmitter software is used for the Divert system.For more information on the basic functions of an indicating transmitter, please seethe PR-23 manual, chapters 3 and 10.

3 Mounting 7

3 Mounting

For mounting of the process refractometers and the isolation valves, consult the sep-arate process refractometer PR-23 instruction manual.

Figure 3.1 Mounting the Divert control system

3.1 Mounting prism washK-Patents recommends to use a steam trap instead of a preconditioning valve toremove condensate from the steam line.


3.2 WiringFor wiring for complete system, see Figure 3.2 which shows the connections to theIndicating transmitters and to steam washing. Figure 3.3 has information of allconnections to the Divert control unit.

Figure 3.2 Transmitter wiring cables and connections

3.2.1 Relays

Relay 1 NORMAL/DIVERT informationRelay 2 NORMAL/DIVERT informationRelay 3 SOLIDS WARNING: when one of the refractometers goes lower than the

solids warning limit, typically 60% or higher. See Section 5.6.1.Relay 4 SOLIDS ALARM: when one of the refractometers goes lower than the

solids alarm limit, typically 58% or higher. See Section 5.6.2.Relay 5 Refractometer signal difference warning: when the refractometer readings

have more than 2% difference in concentration. See Section 5.5.Relay 6 Horn relay: connection to the audible alarm. See Section 7.5.Relay 7 Header wash key information. See Section 3.3.3.Relay 8 Refractometer A malfunction information. See Sections 6.2 and 7.4.Relay 9 Refractometer B malfunction information. See Sections 6.2 and 7.4.Relay 10 Information on if refractometer A is active in the Divert Control System

or dropped off.Relay 11 Information on if refractomter B is active in the Divert Control System or

dropped off.

3 Mounting 9

Figure 3.3 Divert control unit internal wiring


3.3 Switch inputs

3.3.1 External divert reset button+mounting

If you want to use external Divert reset button, it can be connected max. 200 m(600 ft) from the DD-23 Divert control unit. Use normal instrument cable 2x0.5(AWG 20) and connect cable to DD-23 motherboard input J9.Note: You must make sure both refractometers A and B are working OK beforestarting to use the remote divert button (the remote interface can be used to checkon the refractometers, see Chapter 8).Note: The external reset button connection is normally open (NO).

3.3.2 External Divert switch/push button

An external divert switch can be connected to the DD-23 Divert Control Unit, inputJ8. If the external divert switch is not used, a jumper has to be connected across J8.the unit is delivered with this jumper unconnected.

3.3.3 Header wash key

Black liquor is injected to the recovery boiler through liquor guns. Occassionally theheader ring needs washing and during that procedure the divert system has to beby-passed and the liquor guns have to be removed from the furnace. The DigitalDivert Control System DD-23 allows for a safe override of divert logic during headerring wash.The override is mounted by connecting the gun micro switches in series to the Headerwash/override key switch input J10, see Figure 3.5.Note: The Header wash key may be used without the external switch information ifa jumper (dotted line in Figure 3.5) is placed to swith input J10. If the input isleft open, the key does not have any effect. The unit is delivered with this jumperconnected.

3 Mounting 11

DD-23Operator panel

OVERRIDEHEADER WASH

HEADERWASHKEY

MICROSWITCHon each liquor gun oron liquor gun door

Recoveryboiler

Figure 3.4 Header wash key functionality

Guns out microswitches

HEADERWASHKEY

SWITCH INPUTJ10

Figure 3.5 Header wash key connections


3.4 Remote ethernet connectionThe Ethernet connection for the remote interface and data logging purposes is locatedinside the Divert control unit on the right side of the processor unit. It is markedEthernet.

Ethernet out

Figure 3.6 Ethernet connection

4 Startup 13

4 Startup

4.1 Divert system pre-startup checklist1. SDI Isolation valves mounted correctly

a. Vertical pipe; MTG453b. Horizontal pipe; MTG471

2. DD-23 control unit installed; DIM243, Figure 9.1 on page 37

3. Pressure reducing valve, solenoid valve, steam trap installed and connected to theprism wash nozzle on each sensor

a. Steam pipes for black liquor; MTG470b. Nozzle; MTG482

4. 9–15 bar (130–220 psi) steam connected to the solenoid valve on each sensor

5. Instrumentation air 4–6 bar (60–90 psi) connect to the solenoid valve on eachsensor

6. Power supply (230/110Vac/24Vdc) connected; SYS358/Figure 3.1 on page 7,WRG366, Figure 3.1 on page 7

a. Transmitter Ab. Transmitter Bc. Divert control unitd. Solenoid valve Ae. Solenoid valve B

7. Cables connected; SYS358/Figure 3.1 on page 7, WRG366, Figure 3.1 on page 7

a. Transmitter A to sensor Ab. Transmitter B to sensor Bc. Transmitter A to solenoid valve Ad. Transmitter B to solenoid valve Be. Relay information from the Divert control unit to your control system or the

Divert valvef. Transmitter A mA output to your control systemg. Transmitter B mA output to your control systemh. Ethernet to your control system (optional)


4.2 Divert control unit DD-23 startupFor the refractometer startup, consult Chapter 5 in the separate Process refractometerPR-23 manual.

1. Check the wiring and supply voltage.Note: Before the power is switched on, the divert output relay ’normal operation’is in divert position.

2. Connect the mains power to start the system.Note: There are no power switches in the instruments. They are always On whenthe mains power is connected.

3. While the Control unit is powering up, the DIVERT and SOLIDS ALARM lights are bothblinking. When the unit is fully functional, it is in the divert mode: the DIVERTlight is on and the SOLIDS ALARM light is blinking.

4. Press the LIGHT TEST button on the Divert control unit. All 12 lights should switchon.

5. Reset the solids alarm by pressing the ALARM RESET button.Note: The indicator stops blinking and should stay on.

6. Each indicating transmitter should now state refractometer letter, either a or b, inthe upper left corner of the transmitter display. If there’s a question mark insteadof a letter on either of the transmitters, see Chapter 6.If the process pipe is full, the message for each refractometer should be NORMALOPERATION; if process pipe is still empty, message will be NO SAMPLE.Now activate refractometer A into the Divert by pushing the button A IN OPERATIONon the Divert control unit panel. The button lights up and on the transmitterdisplay the refractometer letter changes to capital A. Then activate refractometerB similarly by pushing the button B IN OPERATION.Note: If the green IN OPERATION light blinks, the refractometer in question is per-forming wash. The refractometer will automatically come into operation after ithas finished washing.

7. Now the Divert control system DD-23 is set for normal monitoring operation.

8. When black liquor is in the line, check that the prism wash is working for eachrefractometer. First press soft key MENU on the transmitter keyboard, then choose3 SYSTEM STATUS to get to the system status display. Now press soft key WASH toinitiate manual wash; follow the optical image and check that it changes duringthe steam wash. If wash was successful, wait until message is NORMAL OPERATIONand then proceed with startup. If wash doesn’t seem to work, see Chapter 6.

9. If the three green lights on the third row are all on and all conditions for safe boileroperation are satisfied, turn off diversion by pressing the DIVERT RESET button. Allwarning lights are now turned off and only the 3 green lights are on.

5 Configuration 15

5 Configuration

The K-Patents Divert control system is shipped fully calibrated by the manufacturer.This chapter contains instructions on how to make fine adjustments of the system.

5.1 Calibration lockParameter changes are possible only when the calibration lock is open. The calibrationlock can be closed by a switch inside the control unit cover (see Figure 5.1). Whenthe lock is open, a red led is illuminated next to the lock switch. For safety reasons,keep the calibration lock open only during parameter changes, done through the webinterface (see Chapter 8).

CALIBRATIONLOCK

CALIBRATIONLOCK

Figure 5.1 Location of the calibration lock


5.2 Divert decision rulesTwo refractometers in operation:BLRBAC states the following: For the solids measurements, two refractometers inseries must be used. When both refractometers are in service, the requirement for anautomatic black liquor diversion can be satisfied by either of the following options:

1. If either refractometer reads dissolved solids content 58% (default) or below,an automatic black liquor diversion must take place.

2. When both refractometers read dissolved solids content 58% (default) orbelow, an automatic black liquor diversion must take place.

Either option is satisfactory.The rules are listed in decreasing order of security. Only rule 1 satisfies the high safetyrequirements set by BLRBAC, August, 1982. On the other hand, the probability offalse trips decreases with decreasing safety. It means that if false trips are too frequent,the rule 2 may be preferred at the cost of safety. The rule 2 has later been acceptedby BLRBAC.The divert decision rule is selected by the rule switch inside the divert control unitcover (Figure 5.1). The state of the switch is indicated by a yellow indicator LED forrule #2 and a green one for rule #1.

Rule switch Rule1-of-2 Rule #12-of-2 Rule #2

Table 5.1 Divert decision rule selection.

The logical description of the safety decision logics is given Tables 5.3 and 5.2 below.

A

Bunder 58% over 58%

under 58% unsafe unsafeover 58% unsafe safe

Table 5.2 Two instruments in operation, rule 1-of-2

A

Bunder 58% over 58%

under 58% unsafe safeover 58% safe safe

Table 5.3 Two instruments in operation, rule 2-of-2

5 Configuration 17

Only one refractometer in operation:When only one instrument is in operation the divert action takes place if this instru-ment reads 58 % or below. The rule selection has no influence on the divert decisionin this case.

A or Bunder 58% unsafeover 58% safe

Table 5.4 Operation logic when only one instrument operating

No refractometer in operation:If both instruments are out of operation (due to malfunction or maintenance), thenaccording to BLRBAC divert action must take place.Emergency divertIn all cases the system may be set to DIVERT by pressing the EMERGENCY DIVERT button(or an external emergency divert button, see Section 2.3.8).

5.3 Refractometer concentration measurementFor refractometer calibration consult also Chapter 6 in the separate Process refrac-tometer PR-23 Instruction manual.The CONC% displays of the two indicating transmitters have to show the same valuewithin 0.5 %. If there is a difference, this can be eliminated by adjusting the bias forone of the refractomers; comparison with sample determination can decide which oneshould be corrected.In the PR-23 refractometer system, bias is the parameter F00, the third parameterin the field adjustment parameter list. To change it, first press the MENU soft key,then 5 CALIBRATION, then 1 CHEMICAL & FIELD PARAMETERS and then 2 FIELD CALIBRATIONPARAMETERS. Choose 3 F00 (BIAS) to change the bias (see Section 6.2.5 in the PR-23manual).Example: If the Indicating transmitter A displays 68.2% and B displays 68.8%, thedifference can be eliminated by lowering B by 0.6%. This is done by setting the fieldcalibration parameter F00 to -0.6 in Indicating transmitter B.Due to its digital measurement principle, the readings of the K-Patents Process re-fractometer do not drift by time. Frequent recalibrations based on offline moistureanalysis must be avoided, as they will introduce random fluctuations to the refrac-tometer readings.


5.4 Refractometer activation for divert controlWhen a refractometer is activated for Divert control, the upper left corner of thetransmitter display shows alternatively A, a, B, b or ?. If the corner is blank, theinstrument is not suitable for divert operation.

Transmitter A, inDivert operation

Transmitter B, notin Divert operation

Ethernetconnection failure

Figure 5.2 Indicating transmitters (STR) activated to Divert control

The decision to display A (a) or alternatively B (b) depends on the IP address set-tings in the transmitter. The IP address of instrument A is 172.16.23.2 and that ofinstrument B is 172.16.23.3. These addresses have been set in the factory and shouldnot be changed. (See Chapter 8 for information on system IP address and connectingto the DD-23 system.)Note: If a question mark appears on the transmitter display, the reason is usuallythat the Ethernet cable between the transmitter and the Control unit is not properlyconnected or the Divert control unit is not powered on. Reconnect (or replace cable,if necessary) to fix.The refractometer program version has to be 3.00 or higher to have divert systemfunctionality. Also, the refractometer has to have the correct software parameters tobe used in a divert control system. In order to convert a stand-alone refractometerinto one used on the Divert control system, please contact K-Patents. The easiestway to check if a refractometer is configured for DD-23 use is to look at the maindisplay. If the ?/a/A/b/B letter is present (see Figure 5.2), the instrument may beused in the Divert control system.If a DD-23 activated transmitter is used in another type of application, the divertfunction has to be deactivated by K-Patents.

5.5 Signal difference alarmAccording to BLRBAC, if a difference of 2% in solids (absolute value) or greaterexists between refractometer readings, an alarm shall be activated.The alarm limit of 2% is the maximum difference. The limit can be changed into asmaller number through the remote interface, see Chapter 8.

5 Configuration 19

5.6 Low alarms

5.6.1 Solids warning

If the concentration reading of either refractometer falls below this limit (60% bydefault), the warning is activated. The limit can be changed through the remoteinterface, see Section 8.2.5.Note: Minimum low warning level is 60% according to BLRBAC.

5.6.2 Solids alarm

If the concentration reading of either refractometer falls below this limit (58% by de-fault), the alarm is activated. The limit can be changed through the remote interface,see Chapter 8.Note: Minimum low alarm level is 58% according to BLRBAC.

5.7 Refractometer malfunction alarmThe built-in intelligent diagnostics of a K-Patents Process refractometer provide atight control of the operation. A full test cycle is completed with an interval of lessthan one second. For details consult the Process refractometer PR-23 instructionmanual.Important: Not all malfunctions cause the instrument to be removed from the Divertcontrol system. However, all malfunction alarms need to be checked, see Section 6.2for more information.

5.8 Prism washEven though the sensors are equipped with a steam wash facility, it is not necessarilyneeded. For K-Patents Process Refractometer, the need of prism wash is reduced andeven in some cases eliminated.However, an automatic regular prism wash provides an efficient check that the re-fractometer reacts. A steam wash of 3 seconds every half hour should be sufficient.Only one instrument is washing at a time, and during the wash the system acts inthe single-instrument mode.To change wash times or relay configurations, consult the PR-23 process refractometersystem manual, sections 6.1.3. Configuring relays and 6.3.1. Setting prism washparameters.The recommended wash pressures and times are given in the table below.

Wash parameters for Safe-DriveTM Isolation valve nozzle SDI

Minimum aboveprocess pressure

Maximum aboveprocess pressure

Washtime

Reco-very

Interval

Steam (SN) 5 bar (70 psi) 8 bar (115 psi) 3–5 s 20–30 s 20–30 min

Important: Do not exceed the recommended wash times, because some process mediamay burn to the prism surface if steamed for longer time. In case of coating, shortenthe wash interval.

6 Regular maintenance and troubleshooting 21

6 Regular maintenance and troubleshooting

As the Divert control system is a pure digital system, no special maintenance isneeded. The LIGHT TEST button on the operator panel (Figure 2.1) sends a signal tothe microprocessor, and the microprocessor switches all 12 LED lights on as long asthe button is pressed. This way not only the lights but also the processing system ischecked.To assist the identification of a faulty component, the information flow is given inSection 6.1. Also the logic diagrams of Chapter 7 may be of help.

6.1 Information flowThe divert control unit is connected to the refractometers through an Ethernet con-nection. The Control system asks for the measurement data from the instrumentsseveral times each second. Based on the data received the divert operation decisionsare made.Each refractometer performs its measurement functions independently. The instru-ments also have their own internal diagnostics, which are used in the divert decisionlogic, as well (see Section 6.2).As the Divert Control System requests information several times a second, all commu-nication problems are found immediately. In case one of the refractometers does notrespond to the control unit, the non-responding instrument is dropped from operationand the malfunction alarm is set.An important information when troubleshooting communication problems is the letteron the upper left corner of each refractometer (see Figure 5.2). If the instrumenthas not received any data requests from the Divert Control Unit during the lastsecond, the letter turns into a question mark (?). If the letter is a/A/b/B, thenthe communication link between the Divert control unit and the instrument is fullyfunctional.

6.2 MalfunctionsIf the Divert Control Unit cannot communicate with a refractometer, or if the internaldiagnostics of a refractometer indicate a measurement problem, the Malfunction indi-cator (see Figure 2.1) is illuminated and the corresponding relay 8 or 9 (see Figure 3.3)is activated.The diagnostic message of the refractometer can be seen on the transmitter screen(see Figure 5.1). Some of these messages, e.g. PRISM WASH, are only informative anddo not indicate a measurement problem. Table 6.1 below summarizes all diagnosticmessages and their effect on the Divert control system operation.


If the malfunction is severe enough to make the measurement result un-reliable, the refractometer cannot be used in making the divert decision.In that case the instrument is dropped from the Divert Control System, and cannotbe taken on-line manually until the problem is fixed.For more information on possible causes of each error, see the PR-23 instructionmanual, Chapter 8.

Message Instrument willbe dropped

from the DivertControl System

EXTERNAL HOLD

EXTERNAL WASH STOP

HIGH SENSOR HUMIDITY

HIGH SENSOR TEMP

HIGH TRANSMITTER TEMP

LOW IMAGE QUALITY

LOW TEMP WASH STOP

LOW TRANSMITTER VOLT

NO OPTICAL IMAGE X

NO SAMPLE

NO SAMPLE/WASH STOP

NO SENSOR X

NO SENSOR SIGNAL X

NORMAL OPERATION

OUTSIDE LIGHT ERROR X

OUTSIDE LIGHT TO PRISM

PRECONDITIONING

PRISM COATED X

PRISM WASH

PRISM WASH FAILURE

RECOVERING

SHORT-CIRCUIT X

STARTING UP... X

TEMP MEASUREMENT FAULT X

Table 6.1 Diagnostic messages and their effect on Divert operation

6 Regular maintenance and troubleshooting 23

6.3 Diagnostic toolsIn order to make troubleshooting easier, there are several built-in diagnostic tools.An event log is built in the system. A short log showing last 6 events can be accessedfrom the transmitter main display by pressing the soft key DD23. A more completeevent log can be found in the web-based remote interface (see Section 8.2.4).

Figure 6.1 Transmitter log page for instrument A

The remote interface also provides a diagnostic page which gives full informationon the system state (concentrations, relay state, switch state, indicator state), seeSection 8.2.3.

6.4 Troubleshooting

6.4.1 A question mark (?) on the refractometer display

Cause: The refractometer does not receive information request packets from theDivert Control Unit. This may be caused by a faulty cable, faulty parameters, orequipment malfunction either in the refractometer or in the Divert Control Unit.Action: If the instrument has never been functional, or if it is possible someone haschanged the instrument parameters, there may be a configuration problem with the IPaddresses. The IP address in the refractometer should be set as given in Section 5.4.If possible, cross-check the addresses from the diagnostic web page.A physical problem can be ruled out by looking at a small LED close to the trans-mitter’s Ethernet connector. If the LED is green, the cable is ok. One way to isolatethe problem is to swap the cables between the refractometers. A standard Ethernetcable can be used as a troubleshooting aid (either straight-through or cross-over).

6.4.2 A refractometer refuses to come on-line

Cause: Either there is no communication to the refractometer or there is a malfunc-tion on the refractometer. It is also possible the transmitter is not configured forDivert use.Action: Check that there is a/A/b/B on the refractometer display. If there is aquestion mark (?) instead, see above.Check that there is a soft key DD23 on the refractometer main display (see Figure 6.2below). If the soft key is not present in the main display, the instrument is notconfigured for Divert use. If this is the case, please contact K-Patents.In other cases, check the diagnostic message on the refractometer screen (see Sec-tion 6.2).


Figure 6.2 Transmitter main display, instrument in Divert use

6.4.3 No lights come up in the Divert Control Unit

Cause: There is no power on the instrument or there is a hardware fault.Action: Check that the instrument receives power. In normal operation severalrelays have their associated LEDs lit. If there are any LEDs lit in the Divert ControlUnit, the unit receives power.

6.4.4 All lights are blinking

Cause: There is an unrecoverable hardware fault in the Divert Control Unit.Action: Please contact K-Patents.

7 Divert control logics 25

7 Divert control logics

A logical description of the system is provided to complement the operational de-scription given in the previous chapters.

7.1 Safety decision logicThe core of the Divert control system is the safety decision logic, which makes theultimate decision whether the black liquor can be safely fed to the burner or not.The logic is described in the flow diagram in Figure 7.1. The factors affecting thedecision are the number of instruments in operation (none, one or two) and theirmeasurement results. Also the selected divert rule is taken into account when two in-struments are in operation. For a description of different rules, please see Section 5.2.As a result of this logic, the system is either in SAFE SOLIDS or UNSAFE SOLIDSstate. When the system is in the SAFE SOLIDS state, the SAFE SOLIDS light is illumi-nated.

no

no no

no no

yes

UNSAFE SOLIDSSAFE SOLIDS

NO INSTRU-

MENTS!

Rule 2-of-2

2 instruments

available?

1 instrument

available?Rule 1-of-2?

Both instruments

CONC ≥58%CONC ≥58%?

Either instrument

CONC ≥58%?

yes

yesyes

yes yes

no

Figure 7.1 Safe solids decision logic


7.2 Divert decision logicAfter the system has evaluated the solid contents to be either safe or unsafe (seeSection 7.1), it decides whether the the system should be in the DIVERT state. Thisdecision is made according to the flow diagram in Figure 7.2.The default state of the system is the DIVERT state. It can be changed to the NODIVERT state only by manually pressing the DIVERT RESET push-button when thesolid content is sufficient (SAFE SOLIDS). If the solid content drops to UNSAFE,the system drops into the DIVERT state.The only exception to this is when the HEADER WASH is active. In that case thesolid content checking is skipped. The system may then be switched between theDIVERT and NO DIVERT states by using the EMERGENCY DIVERT and DIVERT RESETpush buttons in the operator panel (or the equivalent external emergency divert anddivert reset buttons).The system will drop to the DIVERT state in all cases when the EMERGENCY DIVERTbutton (or its external counterpart) is pressed.

NO DIVERT DIVERT

HEADER WASH active?

Safe solids?

EMERGENCYDIVERTpressed?

DIVERT RESET pressed?

yes

yes

yes

no

no

no

no

yes

Figure 7.2 The divert decision logics


7.3 In operation logicWhether an instrument is in operation depends on the operator’s commands and theinstrument’s diagnostics. The decision is carried out as outlined in Figure 7.3An instrument can be in one of three different states: IN OPERATION, NOT INOPERATION, and WAIT. When the instrument is IN OPERATION, it is used indeciding whether the solid content is in the safe level (see Section 7.1). When theinstrument is NOT IN OPERATION or WAIT states, it is not used.The WAIT state occurs when the operator has requested the instrument to come intooperation by pressing the button, but the instrument is in the wash cycle and willcome into operation after the wash cycle is completed.The actual state can be seen from the IN OPERATION light. If the light is on, the instru-ment is IN OPERATION. If the light is off, the instrument is NOT IN OPERATION,and if the light is blinking it is in the WAIT state.The default state of an instrument is to be NOT IN OPERATION. It can be takeninto operation by pressing the IN OPERATION button unless there is a critical malfunction(see Section 6.2).An instrument automatically drops into NOT IN OPERATION if there is a criticalmalfunction. It may also be dropped by the IN OPERATION button unless it is the onlyinstrument used.


IN OPERATIONbutton pressed

IN OPERATIONbutton pressed

yes

yes

yes

yes

no

no

wash done

Criticalmal-function

no

no

no

Onlyinstrument?

Washing?

IN OPER. pressed?

Critical malfunction?

WAIT(LIGHT BLINKING)

IN OPERATION(LIGHT ON, RELAYS

10, 11 ACTIVE)

Criticalmalfunction?

NOT IN OPERATION(LIGHT OFF)

yes

Figure 7.3 Operation logic


7.4 Malfunction logic

Instr. malfunctionin B?

Communication timeout to A?

Instr. malfunctionin A?

yes

no

no

no

no

yes

yes

yes

Communication timeout to B?

NO MALFUNCTION

MALFUNCTION

Figure 7.4 Malfunction logic

The MALFUNCTION light is illuminatedwhen the internal diagnostics of ei-ther of the two instruments indi-cates a malfunction or there is acommunication timeout to either ofthe instruments (Figure 7.4).It should be noted that not all mal-functions are critical malfunctionswhich drop the instrument from op-eration (see Section 7.3). For a com-plete list of possible malfunctions,please see Section 6.2.The MALFUNCTION light reflects thedecision taken by this logic. How-ever, as the MALFUNCTION light is oneof the resettable alarms, it may beblinking even when the malfunctionitself is cleared if the ALARM RESETbutton has not been pressed (seeSection 7.5).


7.5 Resettable alarm logic

UNACKNOWLEDGED ALARM

(Blinking, Relay 6 active)

ALARM(Light on, Relay 6 inactive)

Alarm source active?

ALARM RESETpressed?

Alarm source active?

yes

no

no

no

yes

yes

NO ALARM(Light off, Relay 6 inactive)

Figure 7.5 The resettable alarm logic

In order to identify new alarms, thereis a resettable alarm logic in the Di-vert control unit. There are four pos-sible alarm sources: SOLIDS ALARM,SOLIDS WARNING, A&B DIFFER-ENCE, and MALFUNCTION. All ofthese follow the same alarm reset rules(see Figure 7.5).When a new (unacknowledged) alarmactivates, the corresponding light startsblinking in the operator panel, and re-lay 6 is activated. When the ALARMRESET button is pressed, relay 6 is in-activated.The state of the alarm indicator in theoperator panel depends on whether thecause for the alarm is still present. Ifthe cause has cleared (e.g. solids con-tent has risen above the warning limit),the light goes off when the ALARM RE-SET is pressed. If the cause has notcleared, the light will be steadily illu-minated.A non-illuminated light means thereis no alarm. A steadily illuminatedalarm light means there is a problemwhich persists but the problem has beenacknowledged by pressing the ALARMRESET. A blinking light means the prob-lem has not been acknowledged, butgives no information whether the prob-lem is still there or not.


7.6 Refractometer difference logicIf there are two refractometers in operation (taken into operation, not washing),the Control unit monitors the difference in reading between the two instruments(figure 7.6). If the difference is more than 2%, a refractometer difference warning isgiven with the corresponding front panel indicator and relay.The divert decision logic (section 7.2) is not affected by the refractometer difference,but a significant difference between the two instruments indicates one of the instru-ments is not measuring reliably. In this case the instruments and wash systems haveto be checked immediately. Ignoring to do this may result in an erroneous divertdecision.

no REFRACTO-METER

DIFFERENCE

|A-B| > 2%?

2 instruments available?

yes

no

no

yes

REFRACTO-METER

DIFFERENCE

Figure 7.6 Refractometer difference logic


7.7 Wash arbitration logicThe Divert Control Unit takes care that if there are two instruments in operation,they won’t wash at the same time (as that would trip the system). This is done bythe simple logic described in Figure 7.7Each instrument control their own wash cycle. Before the start washing, they requesta wash permission from the Divert Control Unit. If the other instrument is alreadywashing, the unit does not grant this permission until the wash cycle is completed.

noWAIT

WASH

IDLE

The otherinstrumentwashing?

yes

wash interval elapsed

wash done

the other instrument done washing

Figure 7.7 Wash arbitration logic

8 Remote control interface 33

8 Remote control interface

The remote interface is based on a web server inside the Divert Control Unit. Itconsists of several web pages, easily accessible through the links on the navigationbar in the left (see Figure 8.1).Note: The remote interface is optimized for the Firefox browser, version 2.0 or newer,although it may work with other browsers. Firefox is free and exists for Windows,Mac OS X and Linux, it can be downloaded through http://www.mozilla.com/.

8.1 Divert Control Unit IP addressThe Divert Control Unit can be reached through two different IP addresses. Innon-networked applications (only a DD-23 and a single computer) the IP address is169.254.23.23. This IP address is factory set and cannot be changed. If the DivertControl Unit is to be connected to a network, the network settings can be changedthrough the parameter page of the remote interface (see Section 8.2.5).

8.2 The remote interface

8.2.1 Main page

The remote indicator main page gives a quick overview over system status.

Figure 8.1 DD-23 Remote control, main page


8.2.2 Instrument pages

The pages for instrument A and instrument B are normal transmitter homepages.See the PR-23 instruction manual, Chapter 12, for more information.Note: By default, the instrument pages open in a new tab in your browser; the DD-23page you started from will stay open in the original tab.

8.2.3 Diagnostics page

The diagnostics page gives a full account on instrument settings and the instrument’sstatus at the moment, including information about relays, switches, pushbuttons, etc.

Figure 8.2 Remote diagnostics page

8 Remote control interface 35

8.2.4 Log page

The log page gives a more extensive, printable log of events.

Figure 8.3 Remote log page


8.2.5 Parameters page

The Divert Control Unit parameters can only be changed through the parameterpage. However, note that the calibration lock (see Section 5.1) has to be open (off)before parameters can be changed. If calibration lock is on, parameter changes arenot possible. The calibration lock status is given on top of the parameter page andif the lock is on, i.e. changes are not permitted, the Submit button is missing.

Figure 8.4 Parameter page

8.3 Data loggingK-Patents provides free of chargea data logging software called K-Patents Toolkit (orPR-11111). Divert logging functionality was introduced in Toolkit version 2.20. If youhave an earlier version of the Toolkit, please contact your K-Patents representativefor a version that is compatible with DD-23.

9 DD-23 specifications 37

9 DD-23 specifications

9.1 Divert Control Unit specifications

Model: DD-23Enclosure: IP66 Nema 4X, dimensions 226 x 267 mm (8.91 x 10.5 in)Supply: 86–240 V AC, 20 VA, 50-60 HzAmbient temperature: max 45 ◦C (113 ◦F)Accessory: Roofed stainless steel mounting plate for the Divert Control

Unit and 2 Indicating transmitters, Figure 9.1Material: AISI 316, dimensions 916 x 488 mm x 250 mm

(36 x 19.2 x 10 in)Relays 1-11: 3A, 250V NO/NC

Figure 9.1 Divert Control Unit mounting plate: Dimensions (mm/in)

Figure 9.2 Divert control unit and Indicatingtransmitter closures: Dimensions (mm/in)


9.2 Divert control unit spare parts

7

1

4

2

3

5

6

9

8

Figure 9.3 Divert Control Unit spare parts

No. Part name Spare part no.

1 DD-23 front panel PR-12100

2 Nikkai LB-15WK switch PR-12101

3 Nikkai SK-12AA key switch PR-12102

4 PR-12020 card PR-12020

5 Moxa switch EDS-205 PR-12103

6 Connector card PR-12010 PR-12010

7 Moxa US-7110-LX processor PR-12104

8 WRA24SX-U power supply PR-10810

9 Enclosure PR-7602

DD-23 motherboard–keyboard cable PR-12105

DD-23 motherboard–Moxa cable PR-12106

39

A Index

1-of-2 162-of-2 16? 23

aA&B DIFFERENCE 5alarmlogic 30refractometer malfunction 19reset 4signal difference 18solids alarm 19solids warning 19

ALARM RESET 4A N OPERATION 4

bB IN OPERATION 4BLRBAC 3, 6, 16, 17, 18, 19button

ALARM RESET 4DIVERT RESET 4EMERGENCY DIVERT 4external emergency divert 6LIGHT TEST 4

ccalibration lock 15, 36coatingsee prism coating

ddiagnostic message 21diagnostics web page 34disposal 2DIVERT 5Divert Control System 1mounting 7overview 3parts 1

Divert Control Unit 3mounting 37spare parts 38specifications 37wiring 9

divert decisionlogic 26rule 16

DIVERT RESET 4divert resetbutton 4

external 10divert rule 16switch 15

eEMERGENCY DIVERT 4, 26event log 23web page 35

externaldivert reset button 10emergency divert button 6, 10

hHEADER WASH 4Header wash key 4, 6mounting 10

iIndicating transmitter 6IP address 18wiring 8

indicator light 4see light

In operation logic 27inputsee switch input

instrument web page 34IP addressDivert Control Unit 33transmitter 18

kkeysee Header wash key

llight

A&B DIFFERENCE 5A IN OPERATION 4B IN OPERATION 4blinking, all 24blinking,DIVERT 14blinking,SOLIDS ALARM 14green 5indicator 4MALFUNCTION 5OVERRIDE 5red 5SAFE SOLIDS 5SOLIDS WARNING 5yellow 5

40

LIGHT TEST 4logsee event log

logicalarms 30divert decision 26in divert operation 27malfunction 29prism wash 32refractometer difference 31safety decision 16, 25

mMALFUNCTION 5malfunction 21light 5logic 29

mountingDivert Control System 7Divert Control Unit 37external Divert reset button 10external emergency divert 10Header wash key 10prism wash 7

nnetwork settings 33

ooperator panel 4OVERRIDE 5

pparametersDivert Control System 36prism wash 19web page 36

prism coating 19prism wash 6, 19arbitration logic 32mounting 7steam pressure 19wash time 19

push button 4

qquestion mark 23

rrefractometerbias 17difference logic 31

malfunction alarm 19relaywiring 8

remotediagnostics page 34instrument page 34interface 33log page 35parameters page 36

resetalarm 4divert 4

ring header wash 6

sSAFE SOLIDS 5safety decision logic 16, 25signal difference alarm 18SOLIDS ALARM 5solids alarm 5, 19SOLIDS WARNING 5solids warning 5, 19spare partsDivert Control Unit 38

startupDivert control unit 14refractometer 14

steam trap 7steam washsee prism wash

switch1-of-2 162-of-2 16divert decision rule 16

switch input 6, 10

ttestingDivert Control Unit 21lights 21

transmittersee Indicating transmitter

wwarranty 2washsee prism wash

web pages 33web server 33wiringDivert control unit 9Indicating transmitter 8

dd-23

Documents

wash medium

wash valve

prism wash system

process medium

control system dd

process line

refractometer difference

control unit dd