model 1818 oxygen scavenger monitorimportant notice: model 1818 oxygen scavenger monitor is shipped...

IMPORTANT NOTICE:

Model 1818 Oxygen Scavenger Monitor is shipped WITHOUT SOFTWARE AND WILL NOT OPERATE UNTIL SOFTWARE ISINSTALLED. For use with Hydrazine, use software found in Cat. No. HYDRAK; for use with ELIMIN-OX®, use software found inCat. No. ELIMAK.

® ELIMIN-OX is a registered trademark of NALCO Chemical Co.

A Thermo Electron business

Model 1818Oxygen Scavenger Monitor

INSTRUCTION MANUAL

TABLE OF CONTENTS

I. General Information I. 1

Introduction I. 1Principles of Operation I. 1Principles of Calibration I. 2Sample Requirements I. 3Description of Model 1818AO Monitor I. 4

II. Instrument Preparation II. 1

Unpacking Instrument II. 1Mounting, Plumbing and Wiring of Series 1800 Monitor II. 1Reagent Diffusion Bottle II. 2Installation of Iodide Electrode II. 3Installation of Reference Electrode II. 3Installation of ATC Probe II. 3Flow Regulation II. 3

III. Instrument Operation III. 1

Description of Basic Unit Controls III. 1Start Up/ Normal Instrument Operation III. 2Initial Instrument Set-Up III. 2Use of Test Mode III. 2Error Mode III. 3Shutdown and Start-Up Procedure III. 4Flow Off III. 4

IV. Installation and Operation of Modules IV. 1

Signal Conditioner Module IV. 1Removing Installed Module IV. 1Replacing Installed Module IV. 1Setting Module Output IV. 1Electrical Connections IV. 2Description of Signal Conditioner IV. 2Programming Measuring Range IV. 3Installation of Optional Alarm Module IV. 3Setting Alarm Output IV. 4Electrical Connections IV. 4Description of Alarm Module Controls IV. 5Alarm During Calibration IV. 5Alarm After Power Failure IV. 5Setting Alarms 1 and 2 IV. 5

V. Calibration V. 1

VI. Instrument Maintenance VI. 1

Maintenance Schedule VI. 1Weekly Maintenance VI. 1Bi-Weekly Maintenance VI. 1Monthly Maintenance VI. 2Bi-Monthly Maintenance VI. 2Quarterly Air Pump Check VI. 2Yearly Preventive Maintenance VI. 3

VII. Troubleshooting VII. 1

VIII. Repair and Service VIII. 1

IX. Notice of Compliance IX. 1

X. Warranty X. 1

XI. Ordering Information XI. 1

XII. Mounting Dimensions XII. 1

XIII. Wiring Diagram XIII. 1

I. 1

I. GENERAL INFORMATION

IntroductionThe ORION Model 1818 Oxygen Scavenger Monitor is one of a series of microprocessor-based analyzersdesigned to measure continuously trace levels of cer-tain oxygen scavengers in relatively pure water. TheModel 1818 Monitor continuously measures these oxygen scavengers at points in the steam/water circuitwhere dissolved oxygen control is critical. Commonmeasuring points are in feedwater, boiler water, oreconomizer inlet, depending on system design andwhere the oxygen scavenger is added. In high and low pressure boiler systems, oxygen scavengers areadded to react with dissolved oxygen present, manyleaving behind a small residual. This residual ensuresthat any small amount of dissolved oxygen that entersthe system through leakage will be removed.

Residual oxygen scavengers should be carefully monitored to prevent costly overdosing, and yet allow enough of the reductant in the system to allow for metal passivation. Also, excess levels of certain oxygen scavengers decompose into ammonia,increasing system alkalinity. Efficient control of oxygenscavengers depends on maintaining a predetermined “safety” zone.

A unique system for pH adjustment eliminates theneed for expensive reagents and frequent mainte-nance. Instrument calibration is quick, simple, highlyreliable and accurate. A temperature sensor, mountedin the sample stream, is used for automatic tempera-ture compensation.The installed signal conditioneroffers the choice between linear and logarithmic con-centration output. Since the 1800 Series Monitorshave been designed with few moving parts, theyrequire little maintenance and are extremely reliable.

Principles Of OperationNumbers refer to Figure 2.

As show in Figure 2, the sample enters the monitorand passes through an inlet valve, 1, bypass filter, 2,pressure regulator, 3, flow meter, 5, and restrictor tub-ing, 6. The sample then passes through the fluid con-nector block into a reagent diffusion bottle, 15, wheresample pH is adjusted and iodine added by means ofpassive diffusion. The pH adjusted sample then flowsback through the connector block into the reagent mixing loop, 11, where the oxygen scavenger in thesample mixes with iodine reagent to form iodide. Thesample then passes the iodide-sensing, 9, and refer-ence, 8, electrodes in the top portion of the flow cell,12. The sample then flows past the temperature, 10,probe into an atmospheric drain, 19.

The oxygen scavenger present in the sample reactswith the iodine to form iodide ion:

OSred + X • I2 = 2X • I- + OSox

where: OSred = oxygen scavenger reduced

OSox = oxygen scavenger oxidized

The iodide electrode responds logarithmically tochanges in the resulting iodide concentration. Thisresponse is described by the Nernst equation:

E = Eo +2.3 (RT/nF) • log (C/Ciso)

where: E = measured electrode potential, mV

Eo= potential, when C equals C(iso), mV

R = ideal gas constant

T = temperature of sample, degrees K

n = valence of ionic species (-1 for iodide ion)

F = Faraday’s constant

C = effective iodide ion concentration (activity)

Ciso = concentration (activity) of iodide ion where potential E is temperature independent (isopotential point)

The above equation indicates that the measuredpotential varies with both temperature and the concen-tration of the ion of interest. In order to eliminate errorcaused by fluctuations in sample temperature, theSeries 1800 Monitor’s microprocessor constantlyupdates temperature corrections from data supplied bythe ATC probe.

From the Nernst equation, the theoretical response ofan iodide ion-selective electrode to a ten-fold changein concentration of 25 °C is -59.16 mV. This is referredto as the electrode slope(s). Most electrodes, however,do not exhibit a theoretical slope. Therefore, the instru-ment is calibrated to determine its actual value. Twostandards are used to provide information necessaryfor the microprocessor to compute the actual slopeand Eo for use during sample analysis.

Acid is added to the sample to prevent a competingreaction from occurring:

3I2 + H2O = 5I- + IO3- + 6H+

Maintaining acidic conditions prevents the release ofiodide which would cause high apparent reductantreadings.

I. 2

Legend

1. Inlet Valve 9. Reference Electrode2. Bypass Filter 10. Temperature Probe3. Pressure Regulator 11. Reagent Mixing Loop4. Flow Valve 12. Flow Cell5. Flowmeter 15. Reagent Diffusion6. Flow Restrictor Tubing Bottle7. Electrolyte Reservoir 19. Drain8. Reference Electrode 21. Bypass Valve

Figure 1Block Diagram of Sample Flow

restrictor temperatureprobe

referenceelectrode

sensingelectrode

calibrationlevel

measuringlevel

flowmeter

flowvalve

pressurereducing

valve

bypassfilter

inletvalve

bypassvalve

drain

reagentadditionsystem

calibrationdiverter

valve

Figure 2Flow During Normal Operation

temperature probe

reference electrode

sensing electrode

calibration level

measuring levelcalibration

diverter valve

reagentadditionsystem

drain

bypassvalve

flowmeter

flow valve

bypass filter

inlet filter

pressurereducingvalve

810

12

15

19

6

119

5

4

3

221

7

1

The pH adjustment and iodine addition are accom-plished by passive diffusion. The sample passesthrough tubing in a reagent bottle containing both acidand iodine. Both substances diffuse through the tubingwall, into the sample, and redissolve. This passivemethod eliminates sample contamination problemsdue to reagent contamination, and makes the fluidhandling apparatus simple and reliable.

Principles Of CalibrationModel 1818 allows the user the ability to perform atwo-point calibration. In addition, with some oxygenscavengers, an off-line or one-point calibration can beperformed. Verify the appropriate calibration method(s)for the reductant being measured by referring to theseparate APPENDIX found in the appropriateApplication Kit.

Off-Line CalibrationSince the oxygen scavenger concentration in feed-water is normally controlled over a rather narrowrange, usually a single-point calibration procedure is sufficient to provide accurate results. The off-line calibration procedure has the advantage of being quick and easy to perform. If sample reductant con-centrations are expected to vary widely from day today or if on-line verification of monitor readings isdesired, follow the Two-Point Calibration procedure.

The off-line calibration feature of Model 1818 allowsthe user to adjust the monitor to values determined byalternate methods used in their laboratory, such as astandard colorimetric method. It is essentially a one-point calibration. To perform off-line calibration, a sample is taken from the bypass of the instrument; the sample value is stored in memory; the sample is analyzed by an alternate method of choice; the previously stored reading is adjusted to the lab methodresult; and the instrument is then returned to the analy-sis mode. The term “off-line calibration” refers only tothe fact that a sample from 1818 bypass is taken “off-line” for laboratory analysis; in fact, no downtime is experienced during the procedure and the instru-ment remains on-line throughout.

I. 3

Two-Point CalibrationThis procedure provides maximum calibration accuracy and requires use of dynamic calibrator, Cat. No. 15DC15/115 V or 15DC20/220 V. In additionto calculation of electrode Eo as is done in off-line calibration procedure, this procedure determines electrode slope.

To perform a dynamic two-point calibration, the 1818 isfirst connected to a reductant-free sample stream. Anappropriate diluted standard is then prepared. A sup-plied syringe is filled with diluted standard and mount-ed on the calibrator. The calibrator is then mountednear the monitor and the syringe tubing connected tothe standard injection port. By adjusting calibratorpump settings, two different flow rates produce twoknown standards diluted into the sample background.By pressing the appropriate keys on the monitor whenprompted, the monitor’s microprocessor completes thecalibration.

If a mistake is made or problems occur during calibra-tion, an error light will come on and alert the operator.By pressing the error key, the operator can accessinformation on the display to help determine the problem.

Sample RequirementsSample Inlet Connection - 1/4” NPTF. If particulatematter is present in sample, prefiltration is necessary.Moderate amounts of particulates will be removed bythe 60 micron stainless steel filter located after inletvalve.

Flow Rate - must be 50 mL/min. minimum at monitorsample inlet.

Pressure - 8-100 psig. Consult ORION for details onsample handling if pressure is outside range.

Temperature - Temperature must be between 15-40 °C.

Oxygen Scavenger Level - Levels are read directly in ppb or ppm.

Sample Alkalinity - Sample alkalinity should not be more than 5 ppm CaCO3 equivalent to ensure two-month reagent life. If sample alkalinity is above 5 up to 10 ppm maximum as CaCO3, reagent life isreduced to six weeks.

For higher sample alkalinity, contact the ORIONTechnical Service.

I. 4

Description of Model 1818AONOTE: Numbers in the description refer to Figure 3.

Sample Inlet Valve (1) - Accepts the sample streamvia 1/4 inch NPTF connector. The customer must supply the sample with a pressure between 8 and 100 psig, and a sample flow rate to the analyzer of50 mL/min. minimum.

Bypass Filter Assembly (2) - 60 micron stainlesssteel filter traps particulate matter in sample stream.

Pressure Regulator (3) - Adjusts flow on incomingsample stream.

Flow Valve (4) - Used to turn off flow to flow cell.

Flow Meter (5) - Measures sample flow rate. 40 mL/min. nominal flow is required through the analyzer.

Flow Restrictor Tubing (6) - Maintains steady sample flow rate in conjunction with pressure regulator.

Pressurized Electrolyte Reservoir (7) - Provides aconstant flow of electrolyte solution through referenceelectrode for maximum stability.

Reference Electrode (8) - Provides a constant refer-ence potential and completes the measurement circuit.Must be placed in right hand side of flow cell.

Iodide Electrode (9) - Senses iodide ions in samplestream and produces an electrical potential dependenton sample oxygen scavenger. Must be placed in lefthand side of flow cell.

ATC Probe (10) - Measures sample temperature and inputs data to microprocessor for automatic temperature compensation (ATC).

Reagent Mixing Loop (11) - Mixes iodine reagent withoxygen scavenger in sample to form iodide, measuredby iodide-sensing electrode.

Flow Cell (12) - Contains reference electrode, sensing electrode, ATC probe and sample measure-ment reservoir.

Thumbscrew (13) - Supports the reagent diffusionbottle.

Fluid Connector Block (14) - Connects reagent diffu-sion bottle to sample stream and flow cell assembly.

Reagent Diffusion Bottle (15) - Acidifies and addsiodine to the sample by means of passive diffusion.

LED Display (16) - Provides digital readouts of concentration, temperature, millivolts and error codes.

Keypad (17) - Consists of five mode keys, four promptindicator lights, two scroll keys and one key for enter-ing data. Mode and error indicators are also incorpo-rated on keypad.

On/Off Switch (18) - Controls all power to the electronics.

Drain (19) - Atmospheric drain prevents back pressureon reference electrode.

Standard Injection Port (20) - Allows connection ofdynamic calibrator tubing to fluid connector block during two-point calibration.

Bypass Valve (21) - Used to throttle flow in bypasssystem.

Check Valve (22) - Prevents backflow of electrolytefrom pressurized reservoir.

Air Pump (23) - Provides air to pressurize the electrolyte reservoir.

Bottle Clamp Band (24) - Holds reagent diffusion bottle securely in place.

I. 5

Figure 3Major Monitor Components

6

16

17

18

22

8

11

10

13

20

19

1

24

15

21

214

3

4

12

23

9

5

7

Pure Water™ Monitors1800 Series

Release latchesto access

II. 1

II. INSTRUMENT PREPARATION

Figure 4Unpacking Monitor

Unpacking InstrumentRefer to Figure 4.

Report any obvious damage of shipping container tocarrier and hold for inspection. The carrier (not Orion)is responsible for any damage incurred during ship-ment.

1. Open outer box. Remove foam corner support pieces.

2. Open inner box and remove cardboard retaining shell. Remove accessory boxes and instruction manual.

3. Unbolt the monitor from mounting board. Save all hardware for use during installation.

4. Carefully place the monitor at a convenient location. Do not pull or lift instrument by its fluidic components.

Mounting, Plumbing And Wiring of Series 1800 Monitor1. Select a site for instrument that allows it to be

permanently bolted in an upright position with ampleheight for atmospheric drain operation and readyaccess to both electronic controls and flow cell. The analyzer site must permit connection to sampleline, a drain, an AC power supply, and any connec-tions for output devices.

2. Prepare mounting holes. Carefully lift the Series1800 Monitor and bolt into place. Do not lift instru-ment by pulling on any fluidic components.Be sure to use the four shoulder washers that are provided, they will resist future corrosion.

3. Connect a waste line to a drain of sufficient capacity.

4. Connect sample line to the 1/4-inch tube connector.It is recommended that a shutoff valve be installedat the sampling point.

5. Remove decorative panel inside the cabinet byunscrewing the four Phillips screws. Then removeprotective plug and feed AC power line throughhole. See Figure 5.

6. See APPENDIX for wiring diagram. Disconnect:jumper wire from TB2 terminal 7 and connect to:

TB2 terminal 6 for 100 V AC5 for 115 V AC4 for 220 V AC3 for 240 V AC

Warning: Failure to connect jumping wire tothe proper tab will permanently damage themonitor.

7. Connect:

COMMON to TB2 terminal 1 (most left)

LINE to TB2 terminal 2

GROUND to ground stud adjacent to terminal 1using captive type terminal at the end of groundwire.

Warning: Failure to connect chassis to asuitable ground may result in hazardous conditions. Failure to use captive type terminal could result in potential shock hazard and may jeopardize CSA approval.

II. 2

240V

220V

110V

100V

ground

options

AC power

common

line

jumper

Figure 5Electrical Wiring of 1800 Series Monitors

Figure 6Reagent Diffusion Bottle Assembly

8. All electrical wire feeding through the chassis mustpass through appropriate electrical fittings in order to maintain the design integrity of the splash-proofelectronic chassis. Since different types of fittings are required at various installations, this feed throughis to be supplied by the user.

Warning: A grounded metal conduit isrequired for FCC compliance.

9. Replace decorative panel if no further wiring isrequired.

Warning: Failure to replace decorative panelcould result in potential shock hazard.

Reagent Diffusion Bottle Numbers refer to Figure 3, unless otherwise noted.

NOTE: This procedure requires use of ORIONReagent (Cat. No. 181811).

CAUTION: Care must be taken to avoid con-tact of skin or clothes with this reagent whichcontains concentrated acetic acid and iodine.Avoid breathing vapor. Wear rubber glovesand goggles when performing this procedure.In case of skin contact, flush skin immediatelywith water to prevent burns.

1. Support the bottom of the reagent bottle, 15, release holding clamp, 24, with one hand. Turn thumbscrew, 13, counterclockwise to release diffusion bottle. Unscrew white bottle cap and gray tubing connector assembly. (Keep bottle supplied with instrument as a spare.)

2. Take a new bottle of 181811 reagent to a well-ventilated area such as a laboratory fume hood. Unscrew and remove white cap.

3. Connect diffusion tubing (use Cat. No. 181860 ONLY) to tubing connector assembly to conform to Figure 6. Place the tubing assembly and cap into the bottle.

4. Replace gray cap and screw white cap on tightly.

5. Insert the four nipples on the top of the reagent diffusion bottle into the fluid connector block, 14, as shown in Figure 6.

6. Support the bottom of the reagent bottle with one hand and tighten the thumbscrew clockwise.

7. Reclamp bottle to panel to secure.

white cap

nipples with small O-rings

gray cap with large O-ring

tubing should be connectedto right-hand barbed fittingsonly(as seen from the front)

tubing

barbed fittings

reagentdiffusion bottle

fluid connectorblock

II. 3

Installation of Iodide Electrode1. Unpack iodide electrode (Cat. No. 100022) and

carefully remove protective cap.

2. Polish electrode according to instruction card withstrips (Cat. No. 948201).

3. Insert iodide electrode into sensing hole on left inflow cell.

4. Connect electrode to cable marked “Sens. Elect”.

Installation of Reference Electrode1. Unpack reference electrode, 8, (Cat. No. 100056)

and tubing from shipping box. Remove protectivecaps from bottom and sidearm of electrode. Savecaps for future storage of electrode. Inspect internalof electrode (item 7 in Figure 7). Verify it is at leasthalf filled with the internal fill solution. If not, replacethe electrode.

2. Shake out as much filling solution as possiblethrough sidearm, 30, into sink or drain.

3. While passing 1/8-inch tubing, 31, into electrodethrough sidearm, slide 1/4-inch tubing, 32, oversidearm. The outside tubing should extend 3/8-1/2-inch over sidearm.

4. Remove cap and fluid seal from electrolyte fill solution bottle, 33. Hold bottle in upright position.Check that rubber gasket, 34, is properly aligned,then connect cap end of tubing assembly to bottle.The 1/8-inch tubing should extend to the bottom ofthe bottle.

5. Dry off ceramic frit on base of electrode with tissuepaper. Squeeze bottle for a few seconds. A smallamount of filling solution should bead up on frit sur-face, indicating good electrolyte flow. If no moistureis visible, electrode is clogged and should bereplaced.

6. Invert electrolyte bottle and snap into clip, 35.Locate discharge tube of air pump on fluidic panel.End of tubing has hollow push pin for pressurizingreference reservoir. Puncture base of bottle with pinand push pin down until its PVC base abuts bottle.Mark and date level of fill solution in reservoir. Thenelectrolyte solution will begin to flow into electrode.

7. Connect electrode to electronic chassis by “keepercable” labeled Ref. Elect. Insert electrode into reference hole on right in flow cell. See Figure 3.

35

33

34

31

32

30

7

Figure 7Reference Electrode Assembly

Installation Of ATC ProbeThe automatic temperature compensation (ATC) probeis already connected to the electronics housing. Insertinto hole of 3/8-inch tee fitting draining flowcell, locatedbehind electrodes.

Flow RegulationWhen the Model 1818AO Monitor is first commis-sioned, it is advisable to flush out fluidics system atleast one hour prior to initial calibration and use. Theelectronics need not be turned on at this time. Refer toFigure 3.

1. Open sample inlet valve, 1.

2. Pull out red locking ring of pressure regulator, 3, then adjust black knob so that ball of flow meter reads 40ml/min.. Push in red locking ring to secure the setting.

3. Open bypass valve, 21. Check for appropriate sample flow. Readjust pressure regulator if required.

4. Wait at least one hour before calibrating analyzer.

III. 1

III. INSTRUMENT OPERATION

test sample

°C ppm

mV ppb

slope error •

Eo electrode stable •

a

c

d

b

enter/done

sample test program

cal.

error

fill/flowoff

drain/flowon

addstd. 1

addstd. 2

amplifier ORION 2A01

Figure 8Front Panel Keypad

Description of Basic Unit ControlsOn/Off Switch - Controls powers to all electronics andair pump. It is located on electronic chassis bottomand includes an integral circuit breaker.

LCD Display - Displays four-and-one-half digit pluspolarity sign used to read concentration, slope, Eo, millivolts, temperature, error messages, and diagnosticinformation.

Mode Indicating LED - (Located to left of LCD display.) Indicates range (ppb or ppm), error codes,and electrode stable in sample mode. Displays tem-perature (°C), millivolts, electrode slope, and Eo onLCD in test mode.

Prompt Indicating LED - Prompts the user during cal-ibration. Four LED’s located in keypad region are used.These are: add STD 1, add STD 2, begin calibration,two-point calibration complete.

/\ and \/ Keys - increases or decreases displayed val-ues that can be operator-changed such as alarm level,analog output range, and off-line calibration values.

Enter/done Key - Enters value displayed on LCD into“permanent” memory for later use. Key also indicatesto microcomputer that a required calibration step hasbeen completed.

Sample Key - Puts Series 1800 Monitor into samplemode and (re)activates any optional modules. This isalso its default mode, e.g., instrument automaticallyenters sample mode when first turned on and after calibration.

Cal Key - Starts Series 1800 Monitor into calibratemode. Operator is then prompted through the stepsnecessary for calibration.

Test Key - Places Series 1800 Monitor into test modewhere LCD displays temperature, millivolts, Eo andslope. Each successive push of key, steps instrumentthrough this sequence, and an LED on the left of display indicates value displayed.

Error - If error LED is lit (soft error), then pressing keycauses LCD to display an error code. Note, in thecase of “hard error,” the LCD would cease to displaynormal output but would display error code only. Referto Error Code Table.

Program Key - Used to program expected calibrationconcentration increments. Also used in conjunctionwith Cal key for off-line calibration.

a, b, c, and d Keys - For future expansion.

enter/done

cal.

error

two pt.cal.

complete

begincal.

addstd. 2

addstd. 1

III. 2

Start Up/Normal Instrument Operation1. Install the Model 1818AO Monitor according to

instructions in INSTRUMENT PREPARATION.Power supply should be wired for proper voltageand instrument suitably grounded.

2. Turn on flow at sample inlet and flush for at leastone hour.

3. Power up Model 1818AO by toggle switch on bot-tom of electronics case. See Figure 3.

4. LCD will display following information sequence:

a.+ 1.8.8.8.8;

b.1818 while LEDs sequentially light;

NOTE: Mode indicating LEDs and test LEDon modules are not tested during start-upsequence.

c.Revision number of software program (e.g., -2.3-).

5. After completion of steps 1-4, the Monitor is now innormal operational mode “sample.”

Initial Instrument Set-UpBefore first sample measurements on Model 1818AOcan be performed, calibration concentration incre-ments must be programmed into memory.

Program Key Table is found on inside instrument doorand following. Refer to the appropriate APPENDIX forthe particular oxygen scavenger being measured tofind correct P2 and P3 default values.

Table 1 Program Key Table

Code Meaning

P0 Off-line calibration valueP1 (Not used on Model 1818)P2 Concentration increase for STD 1 addition P3 Concentration increase for STD 2 addition

1. Press program key three times until the LCD displays P2. Then the current value for the first concentration increment will be displayed.

2. Change value, if desired, by using keys marked/\ and \/. Press enter/done key to store appropriatevalue in memory. Note P2 cannot exceed the P3value.

3. Press program key until the LCD displays P3 fortwo seconds. Then the current value for the secondconcentration increment will be displayed.

4. Change value, if desired, by using /\ and \/. Pressenter/done key to store appropriate value in memo-ry and unit will automatically return to sample mode.

5. Battery backup of memory will maintain pro-grammed variables for at least one month if batteryis fully charged.

Use of Test ModeWhen test key is pressed, the LCD displays tempera-ture, millivolts, slope and Eo. Every time the test key ispressed, the monitor steps through this sequence. AnLED to the left of display indicates value displayed.

If test mode is entered from sample mode, then sam-ple and test LED are lit. If test mode is entered fromcalibration mode, then calibrate and test LED are lit.Note that while LCD displays test information, theinstrument still continues normal sampling or calibra-tion sequence. Therefore, when sample and testmodes are pressed, signal conditioning and optionalalarm modules are active. When calibrate and testmodes are pressed, calibration prompt LEDs will lightas usual.

To exit test mode, press sample or calibrate key asdesired. LCD will now display instantaneous computedconcentration.

If sample key is pressed while in the calibration mode,the current calibration will abort with no data saved.

III. 3

Error ModeThe Model 1818AO Monitor diagnoses two types oferrors which are termed “hard” and “soft.” In the eventof hard error, the analyzer cannot compute any mean-ingful concentration values, error LED will be lit andLCD will display an error code. The signal conditionermodule will indicate zero scale and alarms will bedeactivated. Hard error must be corrected prior toresumption of normal operation (E40 and E50) by per-forming a complete calibration.

If error LED is active but instrument continues to dis-play concentration, this is termed “soft” error. Softerror can affect accuracy and/or precision of displayedconcentration but not interfere with instrument’s abilityto compute sample concentration. To determine causeof soft error, press error key and LCD will display errorcode.

Table 2 Error Codes

ErrorCode Meaning

E00 No errors

E01 Default values are used. The monitor has not been calibrated since start-up or the reset button was pushed.

E02 Sample is outside the temperature range of 15 - 40 °C

E03 Combination of E01 and E02

E04 Faulty ATC probe, or related circuitry

E05 Combination of E01 and E04

E10 After calibration, the new slope is outside the expected range.

E20 Calibration due. Last calibration performed 30 days ago. A reminder to perform another calibration.

E30 Calibration due and slope error. This indicates that the last calibration performed was at least 30 days ago and the electrode slope was out of specification at that time.

E40 Calibration overdue. It has been at least 6 weeks since the last calibration. The instrument beyond this point could be out of specification. This is a hard error. The only way to exit this error is to perform a complete two-point or off-line calibration.

E50 Calibration overdue and slope error. This indicates that it has been at least 6 weeks sincethe last calibration and the electrode slope was out of specification at that time. The instrument beyond this point could be out of specification. This is a hard error. The only way to exit this error is to perform a complete two-point calibration (or off-line calibration depending on reductant used.)

The most common error codes are combinations of the above codes, but other errors may be displayed:

E12 E10 and E02

E14 E10 and E04

E21 E20 and E01

E22 E20 and E02

III. 4

Shutdown And Start-Up ProcedureThe following steps should be taken if a loss of sampleflow is expected for more than two days. These proce-dures will prevent possible build-up of acidic reagentvapors in the monitor.

NOTE: At cycling power plants or on unitswhere sample flow to the monitor is frequent-ly interrupted, the installation of a backupsample is recommended. Connect a suitablehigh purity water source (such as condensatestorage tank) into the sample line justupstream of the monitor’s sample inlet. Byputting shutoff valves in both sample andbackup lines at this point, backup or actualsample flow can be quickly valved in or outas required. In this way, continuous flow tothe monitor can be supplied and the need forthe following startup/shutdown, equilibrationand recalibration procedures is eliminated.(Note, however, that for sample flow loss ofonly a few hours, monitor recalibrationshould not be required.)

Shutdown1. Shut off sample flow prior to the monitor inlet.

2. Turn power OFF.

WARNING: Wear rubber gloves and safetygoggles to avoid possible injury from reagentresiduals in the system.

3. Loosen clamp securing reagent bottle to fluidicspanel. Support bottom of bottle with one hand, andturn thumbscrew on top of fluid connector block torelease reagent bottle. Store in a well-ventilatedarea such as a laboratory fume hood. If bottle is tobe stored more than two days, remove top cap andtubing assembly and store in a large beaker of tapwater. Otherwise, tubing will become brittle and maybreak when analyzer is restarted.

4. Carefully pull iodide and reference electrodes out ofthe top of the electrode holder and let them hang bytheir connectors. Locate protective end cap from ref-erence electrode kit and place on base of referenceelectrode. This will prevent reference electrode fromdrying out.

Start-Up1. If reagent bottle has been stored longer than two

days without removal of tubing, tubing must bereplaced. If acid reagent is more than four to sixweeks old depending on sample alkalinity, or age isunknown, it should be replaced. Use a fume hood,rubber gloves and goggles for these procedures.Unscrew bottle cap and carefully lift out gray capwith tubing connected. Remove old diffusion tubingfrom nipples. Replace with new tubing, replacereagent if required, and reinstall bottle on analyzer.

2. Polish iodide electrode per Monthly Maintenanceinstructions. Looking at monitor, reinstall carefully inthe left section of the electrode holder.

3. Restore sample flow to analyzer. If necessary,adjust pressure and flow rate through analyzer tonormal ranges.

4. Remove protective end cap from reference elec-trode. Looking at the monitor, reinstall electrode inthe right section of the electrode holder, being care-ful not to disconnect reservoir tubing from electrodesidearm.

5. When meter reading stabilizes (about one hour),recalibrate according to instructions in appropriateoxygen scavenger APPENDIX.

Flow OffIf the analyzer is expected not to have flow for timeperiods of less than twenty-four (24) hours, leave theinstrument on and neglect its output.

If the time is expected to be greater than twenty-fourhours, follow Shutdown procedures.

IV. 1

IV. INSTALLATION AND OPERATION OF MODULES

Signal Conditioner Module (Cat. No. 180001)The Model 1818AO Monitor is shipped with signal conditioner module (Cat. No. 180001) factory installed.Read section Setting Module Output and if you need to change the factory settings, see RemovingInstalled Module.

When factory settings are correct for your instrument,then proceed to section Electrical Connections -Signal Conditioner Module.

Removing Installed Module1. Ensure power to the Series 1800 Monitor is turned

off at power source.

2. Unscrew module keypad from the black bracketsusing the two screws on the keypad.

3. Make certain the plungers are pulled back so thatthe grommets are in a closed position.

4. Slide out module far enough to access DIP switches.

Replacing Installed Module1. Ensure power to the Series 1800 Monitor is turned

off at power source.

2. Open door of electronic assembly. Use No. 2Phillips screwdriver to remove four screws on deco-rative panel.

3. Remove module keypad from shipping box.


5. Make certain the plungers are pulled back so thatthe grommets are in a closed position.

1 2 3 4

Figure 9Dip Switches on Signal Conditioner Board

Setting Module OutputThe signal conditioner has two voltage outputs (0-5 or 0-10 volts) and two current outputs (4-20 or 0-20 mA isolated). Switches are preset by manufactur-er at 0-5 volts and 4-20 mA but can be reset by DIPswitch (see Figure 9) on signal conditioner printed circuit board. When required, alter preset output valuesbefore sliding the module into the monitor as follows(also refer to Table 3).

1. Current output, factory set at 4-20 mA. 0-20 mA isobtained when switching S1-2 into “OFF” positionand S1-3 into “ON” position.

2. Voltage output, factory set at 0-5V DC. 0-10V DC isobtained when switching S1-1 into “ON” position.

3. Slide PC Board onto instrument guide rails. Rear ofPC Board should touch backplane and plug shouldfit securely into its socket. Check that module brack-et is against both rails.

4. Push plungers in.

5. Make certain flex cable is attached to keypad and toPC Board. If not, carefully slide header into socket.

Table 3 Signal Conditioner Output Modes

S1-1 S1-2 S1-3 S1-4

0-5 V OFF X X X0-10 V ON X X X4-20 mA X ON OFF X0-20 mA X OFF ON X

X = No effect

IV. 2

Electrical Connections1. If module keypad is still attached, then unscrew

module keypad from black brackets using the twoscrews on the keypad.

2. Feed wire through hole in chassis bottom labeledoption. See Figure 6.

3. Run wire along wire trough to signal conditioner.

4. Connect wires to voltage (0-5 V or 0-10 V) or cur-rent (0-20 mA or 4-20 mA) output. See Figure 10.

5. Double check the flex cable connections.

6. Screw the keypad on the black metal brackets.


8. Measure to ensure appropriate number of panelshas been removed.

9. Align decorative panel against four stand-offs andreattach with Phillips screws. Decorative panelshould not cover any module.

Warning: For safety reasons, the Series 1800Monitor should not be operated without thedecorative panel in place. Failure to replacethe panel could expose the user to dangerousvoltages.

Table 4 Outputs Of Signal Conditioner Terminals

Output Terminals

Voltage ( + ) 1( – ) 2

Current ( – ) 7( + ) 8

Description Of Signal Conditioner Set Zero - Sets lower level concentration output. Inthis mode LED above set zero is active. To set outputto either linear or logarithmic, hold key down to togglebetween these two output forms.

Set Full Scale - Sets upper level concentration output.In this mode LED above set full scale is active.

Test - Generates zero or full scale output to set up anexternal recording device. Test key deactivates signalconditioner module and either set zero or full scaleLED will be active. After pressing test key, there will bean output delay of up to three seconds. Press samplekey to reactive module.

Mode Indicating LED - (located on left of module keypad). Indicates linear of logarithmic signal output.When set zero key is held, the mode toggles betweenthese output forms.

Figure 10Wiring Diagram of Signal Conditioner Module

log output

linear outputtest

setzero

set fullscale

signal output ORION 2B01Figure 11Signal Conditioner Keypad

1 2 3 4 5 6 7 8

0 to 5V DC or0 to 10v DCOutput1K Ω Load Min.

NC NC NC NC

+ – – +

0 mA to 20 mA or4 mA to 20 mA Current Output1K Ω Load Min.

IV. 3

Programming Measuring Range1. Press set zero key. LED above set zero will acti-

vate and LCD will display current programmedvalue. Present default value is 1 ppb for log rangeand 1 ppb for linear range.

2. Alter value by using /\ and \/ keys. Lowest possiblevalue is 1 ppb.

3. Press enter/done key when the correct value is displayed.

4. Set upper range by pressing set full scale then follow above procedure. Preset default value is 100 ppb. Note that it is not possible to set zerovalue higher than full scale, and a range of at leasttwo decades should be used.

5. To send 0% and 100% of full scale signal to anexternal recording device, press test key on signalconditioner module. The first time causes 0% signalto be sent, the second time causes full scale signal.Remember, there may be up to a three seconddelay when test key is pressed.

6. To alternate from log to linear mode:

Press set zero key. The output mode will togglebetween log and linear, indicated by the LED. Thelog and linear zero and full scale are independent and should be set separately. Press enter/donewhen in desired mode.

Table 5 Default Values - Model 1818

P0 Off-line CAL Value 000P1 Not Used 000P2 STD 1 *P3 STD 2 *Set Zero (log) 1 ppbSet Zero (linear) 1 ppbSet Full Scale (log) 100 ppbSet Full Scale (linear) 100 ppbSet Alarm 1 100 ppbSet Alarm 2 1.00 ppmSlope *Eo *

* See appropriate oxygen scavenger APPENDIX for correct default values for P2, P3, Slope, and Eo.

Installation Optional Alarm Module (Cat. No. 180011)The optional module is mounted in the instrument inthe following manner:

1. Ensure power to the Model 1818 Monitor is turnedoff at power source.

2. Open door of electronic assembly. Use No. 2Phillips screwdriver to remove four screws on decorative panel.

3. Remove optional module keypad assembly fromshipping box.


5. Make certain the plungers on the black metal frameare pulled back so that the grommets are in aclosed position.

IV. 4

1 2 3 4 5 6 7 8

NC

ALARM 1Alarm contacts10A 250VAC max

NO

NC

NO

NC

E6E8E7

ALARM 2Alarm contacts10A 250VAC max

Disable output contactsChoose either NC or NOcontacts 10A 250VAC m

NO NO NO

Setting Alarm OutputFor both alarms 1 and 2, NO and NC conditions areavailable simultaneously. For “alarms disabled” condi-tion, either NO (factory set) or NC is available. Tochange factory setting, perform the following steps:

1. Soldered the appropriate jumper, to changebetween the NO and NC mode for an “alarms dis-abled” remote indication (terminals 7 and 8). SeeFigure 12.

2. Place PC Board onto instrument guide rails. Rear ofPC Board should touch backplane and plug shouldfit securely into its socket. Check that module brack-et is against both rails. Press the two plasticplunger down to lock module in place.

3. Make certain flex cable is attached to keypad and toPC Board. If not, carefully slide header into socket.

Table 6 Terminals 7 And 8 Alarms Disabled

Mode Jumper

NO E7 to E8 (factory set)NC E6 to E8

Figure 12Jumper Connections on Alarm Module PC Board

Electrical Connections1. Feed wire through hole in chassis bottom labeled

“options” (see Figure 5).

2. Run wire along wire trough to alarm module.

3. Connect wires output as required (see Figure 13).


5. Screw the keypad on the black metal brackets.


7. Measure to ensure appropriate number of panelshave been removed.

8. Align decorative panel against four stand-offs andreattach with Phillips screws. Decorative panelshould not cover any optional module.

WARNING: For safety reasons, the Series1800 Monitor should not operate without thedecorative panel in place. Failure to replacethe panel could expose the user to dangerousvoltages.

Table 6 Outputs Of Alarm Module Terminals

Outputs Terminals

Alarm 1 Comm 1NC 2NO 3

Alarm 2 Comm 4NC 5NO 6

Disable Comm 7NO/NC 8

Figure 13Wiring Diagram of Alarm Module

IV. 5

Figure 14Alarm Module Keypad

alarm one

alarm two

deactivated testalarmone

alarmtwo

alarm module ORION

Description of Alarm Module ControlsSet alarm 1 - Sets alarm 1 parameter. When setalarm 1 is pressed, LED on key is active. See Table 5for default values or appropriate oxygen scavengerAPPENDIX.

Set alarm 2 - Sets alarm 2 parameter. When set alarm2 is pressed, LED on key is active. See Table 5 fordefault values.

Test - Activates and deactivates alarm 1 and alarm 2and deactivates relays. Test LED will be lit along withcorresponding mode key. o reactivate module, presssample key on front panel keypad.

Mode indicating LED - (located to left of keypad.)Indicates if either alarm goes off. If alarms are notactive, deactivated LED blinks; for example, during cal-ibration. For both alarms, the LED indicating activationis on whenever concentration is above the set point.Since each alarm output has a normally open and nor-mally closed position, any external alarm can be set togo off when concentration is either above or below theset point.

NOTE: The corresponding LED for eitheralarms turns on when the concentrationexceeds the set point. Simultaneously, therelay closes and the NO position closes.

Alarm During CalibrationDuring calibration the alarm module is automaticallydeactivated. After the completion of calibration theSeries 1800 Monitor automatically enters the samplemode, however, the alarm module remains deactivat-ed. To reactivate, press sample key. The alarm mod-ule is deactivated to avoid the high concentration alarmthat would result from the standards used to calibrate.

Alarm After Power FailureAfter a power failure, the alarm module remains deactivated until sample key on the front panel key-pad (see Figure 8) is pressed. The alarm settings arenot affected by power provided for remote indication.

Setting Alarms 1 and 2Alarm limits work on 5 decade ranges only. Forexample if an alarm is set to 1.0 ppb, the alarm willgo off at 1.0 ppb and will continue to remain onuntil the 10 ppm value is reached. Anything abovethe 5 decade range will turn the alarm off.

1. Press set alarm 1 key. LED above set alarm 1 willactivate and LCD will display present alarm 1 value.

2. Change displayed value by use of /\ and \/ keys.

3. Press enter/done key when correct value is dis-played. Alarm 1 value is now set.

4. Press set alarm 2 key. LED above set alarm 2 willactivate and LCD will display present alarm 2 value.

5. Change displayed value by use of /\ and \/ keys.

6. Press enter/done key when correct value is dis-played. Alarm 2 value is now set.

7. If an external alarm circuit is to be tested, press testkey. The first press of the test key deactivates bothalarms, second press activates alarm 1, and thirdpress activates alarm 2. Press sample key to exittest mode.

alarm set

V. 1

V. CALIBRATION

For complete calibration instructions for the specificoxygen scavenger you wish to measure, see the separate APPENDIX in specific Application Kit.

VI. 1

VI. INSTRUMENT MAINTENANCE

Maintenance ScheduleThe Model 1818AO Monitor is designed for simplemaintenance. Follow instructions in this section toensure proper operation of your instrument. Table 8outlines our recommended maintenance schedule.See Ordering Information in separate APPENDIXfor recommended supplies for the particular oxygenscavenger you wish to measure.

IMPORTANT: To ensure proper maintenanceand good analyzer performance, a service logbook should be kept. Record date and typeof maintenance done. Mark and date fluidlevels of reagent and reference reservoir anddate when replaced. Tag each electrodecable with installation date of electrode. This system has proven to be successful by ORION Service Department, and is espe-cially useful to plants who rotate instrumentoperators.

ORION’s Service Department provides a periodic checkout, calibration, and operator training service on-site to certify analyzer performance to publishedspecifications. This service can be tailored to fit individ-ual customer needs. If interested, please contactORION Service toll-free at 1-800-225-1480.

Table 8 Recommended Maintenance Schedule

Frequency Operation

Weekly Check flow rateVisual inspection.

Bi-Weekly Check reference electrode filling solution and refill if necessary

MonthIy Polish sensing electrodeClean or replace filter element Calibrate

Bi-MonthIy Replace reagent, diffusion tubing,and reagent bottle O-rings

Quarterly Air Pump Check

Yearly Replace reference electrodeReplace iodide electrodeReplace O-rings Replace restrictor tubing

Weekly Maintenance1. Check that sample flow rate is between 35 and 45

mL/min. Correct flow rate is dependent on oxygenscavenger being measured. Verify correct flow rateby referring to appropriate APPENDIX. To alter flowrate, pull out red locking ring of pressure regulator,then rotate black knob to increase (clockwise) ordecrease (counterclockwise) sample flow. Push in red locking ring to set rate.

2. Inspect unit for leakage. Diffusion tubing leakage is indicated by a rise in level of reagent.

3. Check that there are no error indications and displayed concentration is reasonable.

4. Check that reference electrolyte solution is adequate.

Bi-Weekly MaintenanceReplacement of Reference Electrode Filling Solution

1. Refer to Figure 7. Use of Cat. No. 100056Reference Electrode requires use of 181073 fillsolution. With the addition of a pressurized assem-bly for the reference electrode, it is estimated thatusage of 181073 fill solution will be approximately1.5 bottles per month. If reservoir is less than onequarter full, replace solution as follows:

2. Remove spent electrolyte bottle from clip. Unscrewcap and discard bottle.

3. Remove cap and seal from new electrolyte fill solu-tion. Check that rubber gasket is properly aligned,then connect cap/tubing assembly to bottle. The1/8” tubing should extend into the bottle.

4. Invert electrolyte bottle and snap into clip.

5. Use special push pin attached to pressurized refer-ence assembly on monitor to pierce hole in bottomof bottle and to re-pressure reservoir by air pump.

6. Dry frit at a base of reference electrode. Check fritto see bead of fill solution form, indicating good flow.

VI. 2

Monthly MaintenancePolish Iodide Electrode

1. Polish iodide electrode according to instruction cardwith strips, Cat. No. 948201. Replace electrode andreconnect cable.

Replacement/Cleaning of Sample Inlet Filter

1. Turn off sample flow.

2. Remove filter hex cap using 1-inch open-endedwrench.

3. Separate filter cap with bypass valve assemblyfrom filter body.

4. Remove filter element and soft gasket (if necessary).

5. Replace gasket and press new sintered elementinto filter body.

6. Replace hex cap and bypass valve assembly andreposition bypass drain line into drain assembly.

7. Retighten hex cap to approximately 75 oz. intorque.

8. Turn on sample flow and check for leaks.

9. Readjust bypass flow.

10. To clean sintered filter element, clean with agitateddilute hydrochloric acid.

Calibrate Unit

See APPENDIX in appropriate Application Kit forinstructions.

Bi-Monthly MaintenanceReplacement of Reagent, Tubing and O-rings

1. Replace acid reagent and diffusion tubing. Shut offanalyzer prior to inlet. Remove reagent diffusionbottle by unscrewing the black thumbscrew at top ofthe fluid connector block. Support bottle at its base,unsnap clip around middle, and remove bottle fromanalyzer.

CAUTION: Since reagent contains concen-trated acetic acid and iodine which is verycorrosive to skin and eyes, take to well-ventilated area such as a laboratory fumehood. Wear rubber gloves and eye goggles.Unscrew cap and pour old reagent into a suitable waste container.

2. Remove cap, lift out gray insert, and remove old dif-fusion tubing from nipples. Rinse cap with deionizedwater. Replace five small O-rings on tubing con-nector barbs and one large O-ring on reagent bottle.Install new reagent and tubing. Re-install reagentbottle on analyzer, mark level and date. Restoresample flow to monitor. Wait at least one hour toallow analyzer to equilibrate prior to recalibration.

Quarterly Air Pump CheckReference electrode fill solution level should drop atleast 1/8” per month, indicating good flow through theelectrode’s ceramic frit. If flow rate is low, air pumpshould be tested for proper operation.

To test air pump, remove push pin and tubing from reference reservoir. Place tip of pin in beaker of water.Vigorous bubbling should be observed. (Normally, airpumps deliver at least 500 cc/min. of air). Replace airpump if weak or no bubbling action is observed. Toensure tight seal on reservoir, replace with a fresh bottle of fill solution, ORION Cat. No. 181073.

VI. 3

Figure 15Restrictor Tubing Assembly

Yearly Preventive MaintenanceReplace Reference Electrode (Cat. No. 100056)

• See Instrument Preparation for step-by-stepinstructions.

Replace Sensing Electrode (Cat. No. 100022)

• See Instrument Preparation for step-by-step instructions.

Replacement of O-rings

1. Replace flow cell O-ring and microvalve O-ring yearly in addition to monthly reagent and tubingconnector assembly barb O-ring changes. Removetop of flow cell to replace O-ring. Yearly, replace O-ring on microvalve (standard injection port). Both O-rings may be found in 181850 YearlyConsumables Kit.

Replacement of Restrictor Tubing

1. Close sample inlet valve.

2. Loosen fitting connector cap on top of flow meterassembly and pull out restrictor adapter and restric-tor tube assembly.

3. Unscrew restrictor from fluid manifold inlet by loos-ening 5/8” white fitting.

4. Remove gray PVC adapter from end of old restrictortube and save for installation on new tubing.

5. Install adapter on new restrictor tube and connect tofluid manifold.

6. Push adapter into fitting connector on top of flowmeter assembly and hand tighten.

7. Turn on sample inlet valve and check for leaks.Hand tighten where necessary.

restrictor�adapter

restrictor�tube assembly

clamp

fitting

flow �meter O-ring

to flow cellmanifold

VII. 1

VII. TROUBLESHOOTING

The following section covers troubleshooting that can be performed without special tools or skills. Note that inmost installations, the temperature should read between 15-40 °C, millivolt reading between + 200 to -200 shouldbe observed. Slopes between - 40 to -75 mV, and Eo between -50 to +150 should be obtained.

Within the U.S., ORION Service Personnel may be consulted for troubleshooting advice at (800) 225-1480.Within Massachusetts, call (978) 922-4400. Outside the U.S., contact your local ORION Dealer.

Troubleshooting ChecklistMalfunction Possible Cause Remedy

Low Slope Improper calibration technique Recalibrate

Sample electrode defective Replace and recalibrate

Inaccurate standards Recalibrate with fresh standards

Electronics failure Consult Orion

Dynamic calibrator failure Check dynamic calibrator flow rates.

Out-of-Range Electronics failure Try resetting computer (see APPENDIX), Slope or consult ORION.

Reference and sensing cables Swap cables. interchanged

Improper calibration technique Recalibrate.

Sample electrode defective Replace.

Inaccurate standards Recalibrate with fresh standards.

Dynamic calibrator failure Check dynamic calibrator flow rates.

Slow responding sensing electrode Polish sensing electrode and recalibrate

Noisy Reference electrolyte not flowing properly Dry frit of reference electrode.Filling solution should form small bead on frit

within seconds. If no flow, check air pump flow. If OK, reference electrode is clogged and needs replacement.

Electrode failure Replace electrode.

Loose ground wire Check ground wire at flow cell.

Monitor OK/Recorder defective Change recorder.

Signal conditioner Compare LCD output with module output. If LCD is quiet while recorder is noisy, contact ORION.

Temperature probe Engage test key to check temperature stability. If noisy, replace probe.

Electronics failure Try resetting computer (see APPENDIX), or consult ORION

VII. 2

Malfunction Possible Cause Remedy

Excessive Drift Loose ground Check ground wire connection at flow cell. Tighten if necessary.

Reference electrode not Make sure electrolyte bottle isflowing properly connected to air pump.

Reference electrode clogged Replace reference electrode.

Iodide electrode defective Replace electrode.

Temperature probe Engage test key to check temperature stability. If noisy, replace probe.

Burst diffusion tubing Monitor liquid level in reagent bottle. If liquidlevel rises, replace reagent and diffusion tubing.Tubing connector may need replacement.

Electronics failure Try resetting computer (see APPENDIX), or consult ORION.

Low Flow Sample pressure below 8 psi Check sample pressure. If lessRate than 8 psi, increase.

Pressure regulator set too low Increase pressure by pulling onred locking ring and turning black knob clockwise.

Bypass filter clogged Replace or clean filter.

Restrictor tubing crimped or clogged Replace restrictor tubing.

Does Not Inaccurate standards or Use new standard solution,Calibrate Properly defective calibrator (2-point cal.) check dynamic calibrator flow rate.

Reagent spent Replace reagent.

Flow meter inaccurate Check monitor flow rate at drain, adjust to 40mL/min if required.

Electrode failure Replace one or both electrodes.

Noisy during calibration Check syringe for smooth plunger action; replace if required.

Temperature probe failure Replace.


High or Low Monitor out of calibration Perform off-line or two-point calibration. Readings If off-line calibration performed, verify

accuracy of alternate method value.

Inlet filter just replaced Flush one hour until reading stabilizes.

Reagent just changed Recalibrate after one hour.

VII. 3

Malfunction Possible Cause Remedy

Default Power loss while back-up battery was not Allow battery to charge overnight. fully charged Reprogram and recalibrate.

Battery failure Consult ORION.

Default values displayed Ensure enter/done key pressed after calibration after two pt. cal. complete key is lit.

Incorrect Keyboard Computer glitch Turn main power off and on.Display Recalibrate.


Reads 1 … Electrode cable failure, or not Loosen four screws holding main keypad connected to computer board Check that cables are attached securely.


VIII. 1

VIII. REPAIR AND SERVICE

Field Service is dispatched in the U.S. from the home office of ORION. In the United States, call (800) 225-1480. Within Massachusetts, call (978) 922-4400. In Europe, the Middle East, and Africaconsult your authorized ORION dealer, or write:

ORION RESEARCH, INC.

500 Cummings CenterBeverly, MA 01915-6199 USATel: 978-922-4400Dom. Fax: 978-927-3932Int’l. Fax: 978-927-4347

ORION EUROPE.

York StreetCambridge, England CB1 2PXTel: 44-1223-374265Int’l. Fax: 44-1223-374245

ORION FAR EAST

Room 904, Federal building369 Lockhart RoadWanchai, Hong KnogTel: 852-28360981Int’l. Fax: 852-28345160

ORION INDIA

302, 3rd floor, 9/2 East Patel NagarNew Delhi 110 008, IndiaTel: +91 11 574 1382Fax: +91 11 575 1101

ORION CUSTOMER SUPPORT

Toll Free: 800-225-1480WWW:http://www.orionres.comTel: +91 11 574 1382Int’l.e-mail: [email protected]

IX. 1

IX. NOTICE OF COMPLIANCE

This meter may generate radio frequency energy and if not installed and used properly, that is, in strict accor-dance with the manufacturer’s instructions, may causeinterference to radio and television reception. It hasbeen type-tested and found to comply with the limitsfor a Class B computing device in accordance withspecifications in Subpart J of Part 15 of FCC Rules,which are designed to provide reasonable protectionagainst such interference in a residential installation.However, there is no guarantee that interference willnot occur in a particular installation. If the meter doescause interference to radio or television reception,which can be determined by turning the unit off and on,the user is encouraged to try to correct the interferenceby one or more of the following measures:

• Reorient the receiving antenna

• Relocate the meter with respect to the receiver

• Move the meter away from the receiver

• Plug the meter into a different outlet so that themeter and receiver are on different branch circuits.

If necessary, the user should consult the dealer or anexperienced radio/television technician for additionalsuggestions. The user may find the following bookletprepared by the Federal Communications Commissionhelpful:

“How to Identify and Resolve Radio-TV InterferenceProblems.”

This booklet is available from the U.S. GovernmentPrinting Office, Washington, DC 20402

Stock No. 004-000-00345-4

This digital apparatus does not exceed the Class Blimits for radio noise emissions from digital apparatusset out in the Radio Interference Regulations of theCanadian Department of Communications.

Le présent appareil numérique n’émet pas de bruitsradioélectriques dépassant les limites applicables auxappareils numériques de la class A prescrites dans leReglement sur le brouillage radioélectrique édicté parle ministere des Communications du Canada.

X. 1

X. WARRANTY

The ORION Model 1818AO Monitor is warranted to befree from defects in material and workmanship for aperiod of twelve (12) months from the date of installa-tion or eighteen (18) months from the date of shipmentfrom ORION, whichever is earlier, when used undernormal operating conditions and in accordance withthe operating limitations and maintenance proceduresin the instruction manual, and when not having beensubjected to accident, alteration, misuse, or abuse.This warranty is also conditioned upon expendableand consumable items (diffusion tubing, electrodes,and all solutions) being stored at temperaturesbetween 59 °F and 104 °F (15 °C and 45 °C) in a non-corrosive atmosphere.

Industrial electrodes are warranted to be free fromdefects in material and workmanship for a period ofthree (3) months from the date of installation or eigh-teen (18) months from the date of shipment when usedunder normal operating conditions and in accordancewith the operating limitations and maintenance proce-dures given in the instruction manual and when nothaving been subjected to accident, alteration, misuse,or abuse.

In the event of failure within the warranty period,ORION, or its authorized dealer will, at ORION’soption, repair or replace the product non-conforming to the above warranty, or will refund the purchase priceof the unit.

THE WARRANTY DESCRIBED ABOVE IS EXCLU-SIVE AND IN LIEU OF ALL OTHER WARRANTIESWHETHER STATUTORY, EXPRESS OR IMPLIEDINCLUDING, BUT NOT LIMITED TO, ANY IMPLIEDWARRANTY OF MERCHANTABILITY OR FITNESSFOR A PARTICULAR PURPOSE AND ALL WAR-RANTIES ARISING FROM THE COURSE OF DEAL-ING OR USAGE OF TRADE. THE BUYER’S SOLEAND EXCLUSIVE REMEDY IS FOR REPAIR, ORREPLACEMENT OF THE NON-CONFORMINGPRODUCT OR PART THEREOF, OR REFUND OFTHE PURCHASE PRICE, BUT IN NO EVENT SHALLORION (ITS CONTRACTORS AND SUPPLIERS OFANY TIER) BE LIABLE TO THE BUYER OR ANYPERSON FOR ANY SPECIAL INDIRECT, INCIDEN-TAL OR CONSEQUENTIAL DAMAGES WHETHERTHE CLAIMS ARE USED IN CONTRACT, IN TORT(INCLUDING NEGLIGENCE) OR OTHERWISE WITHRESPECT TO OR ARISING OUT OF THE PRODUCTFURNISHED HEREUNDER.

Industrial products used at nuclear facilities are alsosubject to ORION nuclear terms and conditions.Contact ORION if you do not have a copy.

Representations and warranties made by any person,including its authorized dealers, distributors, represen-tatives, and employees of ORION, which are inconsis-tent or in addition to the terms of this warranty shall notbe binding upon ORION unless in writing and signedby one of its officers.

XI. 1

XI. ORDERING INFORMATION

Cat. No. Description

1818AO Microprocessor-based Oxygen Scavenger Monitor, complete with iodide electrode (100022), pressurized assembly with attached push pin for use with reference electrode (100056), one instruction manual, and signal output module. Does not include software foroperation. Requires appropriate Application Kit for Oxygen Scavenger being measured and reagent (181811). Depending on oxygen scavenger and calibration method, dynamic calibrator (15DC15/20) may be required. Wired for 100/115/220/240 V AC, 50/60 Hz.

HYDRAK Application Kit for measurement of HYDRAZINE. Includes software, application-specific mini door label, and APPENDIX to 1818 Instruction Manual.

ELIMAK Application Kit for measurement of ELIMIN-OX®. Includes software, application-specific mini door label, and APPENDIX to 1818 Instruction Manual.

100022 Iodide Electrode for use with detachable cable.

100056 Reference Electrode for use with detachable cable.

181123 Pressure Regulator.

503922-A01 Flow Meter Assembly (181124).

181125 Restrictor Tube Assembly.

181127 Temperature Sensor (located in drain on 1818).

181170 Inlet Filters, stainless steel, 60 micron filters with gaskets, pack of 2.

181171 Filter Gaskets for use with 181170, pack of 2.

181173 Air Pump Assembly.

180001 Signal Conditioner.

180011 Optional Alarm Module.® ELIMIN-OX is a registered trademark of NalcoChemical Co.

XI. 2

ConsumablesCat. No. Description

181811* Reagent (three 1-liter bottles), includes three sets diffusion tubing and O-rings. Six month supply.

181860 Diffusion tubing (three 6 ft. lengths) with fifteen small O-rings for tubing connector barbs, and three large O-rings for reagent bottle.

181073 Reference electrode internal filling solution, five 2-oz. bottles. Average three month supply when used with pressurized refer-ence assembly.

181850* Consumables kit for one year’s operation, consists of two sets of three 1-liter bottles reagent with diffusion tubing and O-rings, (2 x 181811), iodide electrode (100022), reference electrode (100056), four sets offive 2-oz. bottles reference electrode internal fill solution (4 x 181073) for use withpressurized reference assembly, O-rings forflow cell and microvalve, one restriction tube assembly (181125), two 60 micron inlet filters (181170), one filter gasket, and check valve. (Does not contain standard[Cat. No. 151810] needed for two pointcalibration.)

* Contains hazardous material.

For Two Point CalibrationPart No. Description

15DC15/15DC20 Dynamic calibrator for use with multiple instruments. Includes syringe kits (Cat. Nos. 150096 and 180096) and mounting bracket (219135-S01 for use with either 1500 or 1800 Series monitors.)

151810 Standardizing Solution, one pint.

180096 Syringe Kit with 20 cc syringe foruse with 1818 during two point calibration.

* Contains hazardous material.

Spare PartsPart No. Description

703275-A01 Electrode cable.

802062-A01 Power board.

217126-A01 Keypad with driver board.

703278-A01 Power supply to PMA cable.

204743-001 Power switch.

217134-A01 Electrode holder, excluding electrodes.

215934-A01 Tubing connector assembly with gray cap and barbs, and white reagent bottle cap.

217135-A01 Connector block assembly with thumbscrew and injection port.

201815-001 Standard injection port.

1SMXXX Thumbscrew (on fluid block) with three washers.

217129-A01 Pressurized reference assembly for use with 100056.

215508-001 Pressurizing needle.

702573-A01 Tubing spool assembly.

* NOTE: For sample alkalinities up to 5 ppm, 181811 Reagent life is extended to two months. The reagent life is six weeks with sample alkalinities from above 5 to 10 ppm as CaCO3.

XII. 1

XII. MOUNTING DIMENSIONS

NOTE: Two Point Calibration — If dynamiccalibrator and optional mounting shelf areused, leave 12” clearance beneath analyzer.

TB2

3.00"

6.50"

.62.375" DIA.

0.125"0.318 cm

10.50"

17.00"

15.00"

22.75" 23.50"

26.00"

24.75"

1.53"

.88"

1.25"

2.25"

.88" DIA.�3 HOLES

5.25" 10.06"9.32"

10.06"

7.00"

5.03"

3.00"

12.50"

1.4375"

1.125"

3/4" NPT-male

1/4" NPTF

15.75"

10.00"

180°

26.67 cm

SIDE VIEW

FRONTVIEW

BOTTOMVIEW

1 2 3

1

TB1

J1

+ + +2 3

4

13CB1

24

5 6 7 8

240V

220V

115V

100V

CO

MM

240V

220V

115V

100V

CO

MM

}

{

TRANSFORMER

POWER SUPPLY BD.802062

POWERCABLE206333

TO AIR PUMP

SEENOTE 1

TB2205973

RED

WHT

BLK

COMM

GROUND

LINE

HOTPOWER IN REF GND

BLUORNGRN-YEL

NOTE 1Jumper - At installation, remove one side of jumper �and reconnect it to one of four terminals (3,4,5, or 6) �to obtain desired voltage.

XIII. WIRING DIAGRAM

XIII. 1

227331-001 Rev. C

model 1818 oxygen scavenger monitorimportant notice: model 1818 oxygen scavenger monitor is shipped...

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