Omega Engineering CDE-45P Manuel utilisateur

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Table of Contents

PART1-INTRODUCTION...............................................................................................................................3

1.1 General...................................................................................................................................................3

1.2 SensorFeatures.......................................................................................................................................3

1.3 SensorSpecifications(CDE-45P)............................................................................................................4

Figure1-1CDE-45PSensorDimensions(standard, convertiblestyle)............................................................4

PART2–INSTALLATION................................................................................................................................5

2.1 General...................................................................................................................................................5

Figure2-1CDE-45PSensorTypes..................................................................................................................6

2.2 Electrical................................................................................................................................................7

Figure2-2CableDescription,ModelCDE-45P............................................................................................7

Figure2-3Wiring Diagram,CDE-45PSensorandCDTX-45 Monitor/Analyzer...........................................8

PART3–SENSORMOUNTING.......................................................................................................................9

3.1 Cleaning theSensor................................................................................................................................9

3.2 Troubleshooting.................................................................................................................................... 10

OmegaCDE-45P ConductivitySensor Part 1– Introduction

O&MManual

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Part 1-Introduction

1.1 General The ModelCDE-45PConductivitySensormeasuresthe

conductivityofaqueoussolutionsinindustrialand municipal

process applications.It isdesignedtoperforminthe

harshestofenvironments.All sealsaredualo-ring using

multiplesealingmaterials.The sensorisdesignedforuse

withthe Omega CDTX-45 Monitor/Analyzer.

1.2 SensorFeatures • 4-Electrode measurement system. Twoof the

electrodesareused toestablishthe sensordrive

potential, whilethe othertwosensethe flowof current

between the driveelectrodesandmaintainproper

drivepotential. Inconventional2-electrodesensors,

asthe process solutioncoatsthe electrode surfaces,

the sensoroutput signalbeginstodecrease,

producingan artificiallylowconductivity

measurement. The Omega 4-Electrodesystemthus

offersahigh degree of accuracy foralongerperiod of

time. The fourelectrodesaremade of titaniumfor

greaterchemicalresistance.

• The Omega 4-Electrodesystemcompensatesforthe

Effectsof electrode fouling. Asthe electrodes

becomecoated bythe process solution, afeedback

Mechanismdetectsthe decreaseindrivepotential

and automaticallyre-establishestheproperlevels.

Whencoating issuchthat compensationisnolonger

possible, andalarmsignalstheuserthat the sensor

requirescleaning.The systemalsoalertsthe userin

the eventofintegraltemperatureelement failure.

• The Omega 4-Electrodesystemallowsasingle

Sensorconfigurationtobe used reliablyoverawide

Conductivityrange.Thereisno need formultiple

sensorswithvarying cellconstantsthat arerestricted

tonarrowoperating ranges.

• Pt1000 RTD.The temperatureelement used inthis

Sensorishighlyaccurateand providesahighlylinear

output.

OmegaCDE-45P ConductivitySensor Part 1– Introduction

O&MManual

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1.3 SensorSpecifications(CDE-45P)

Measuring Range 0.000to2.000S/cm

WettedMaterials Titanium, PEEK, FKM, EPR

(316SS whensensorissubmersion mounted)

TemperatureCompensation Pt1000RTD

SensorCable 6Conductorplus2shields,

TemperaturePressureRange The choiceofsensormaterial/mountingoptionandthe

hardwareused tomountthesensorwill determine the

temperatureand pressureratings.Pleaseconsultthe

factoryforrelevanttemperatureandpressurerating

information.

MaximumFlowRate 10 feet (3meters)persecond

Max. Sensor-Analyzer

Distance 60 feet (18.2meters)

Weight 1lb.(0.45 kg)

Inches(mm)

Figure1-1CDE-45PSensorDimensions(standard,convertiblestyle)

OMEGACDE-45P ConductivitySensorPart 2– Installation

O&MManual

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Part 2–Installation

2.1 General

The CDE-45PConductivitySensorisdesigned for

industrialand municipalprocess applications.

Mounting optionsinclude flow-through,submersion,

insertion (specialhardwarerequired),orintegral

mounttothe CDTX-45 ConductivityMonitor/Analyzer.

The sensor-to-analyzerdistancemustnotexceed 60

feet (18.2meters).

Calibratethe sensorbeforeplacing it intothe process.

See ModelCDTX-45 Monitor/AnalyzerInstruction

Manualfordetailed calibration instructions.

The sensorcomeswitharemovableguardthat

surroundsthe electrode face.Thisguardminimizes

interferenceeffectsintight locationswherethesensor

faceisclosetosurrounding objects.If itisremoved,

takecaretoleaveatleast 1in3ofspaceinfrontofthe

electrodes.If the guardistobe used,thesensor

mustbe calibratedwithitinplace,sincetheguard

affectsthe sensorcellconstant.

OMEGACDE-45P ConductivitySensorPart 2– Installation

O&MManual

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Figure2-1CDE-45PSensorTypes

SENSORSIZE

A B

1-1/2”

2.75

(70.0)

1.98

(50.4)

2”

3.50

(88.9)

2.50

(63.5)

OMEGACDE-45P ConductivitySensorPart 2– Installation

O&MManual

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2.2 Electrical

The ModelCDE-45Psensorcomesstandardwith15feetof6

conductordoubleshielded cable.The cableispermanently

attachedtothesensor,andaPEEK cordgripisusedtosealaround

the cable.Nevertheless,thecableshouldalways be keptasclean

and dryaspossible.

DANGER: DO NOTconnectsensorcabletopowerlines.

Seriousinjurymayresult.

TakecaretoroutesensorcableawayfromACpowerlines,

adjustablefrequency drives, motors, orothernoisy electricalsignal

lines.Donotrun signallinesinthesameconduitasACpower

lines.Run signalcableindedicatedmetalconduitif possible. For

optimumelectricalnoiseprotection,run an earthground wiretothe

ground terminalinthetransmitter

RefertoFigure2-2, CableDescription and Figure2-3,Wiring

Diagramforillustrativedetailson electricalinstallation.

Figure2-2CableDescription,Model CDE-45P

Only6-wireshielded interconnect cablemustbe used when

connecting the ModelCDE-45Psensortothe analyzer. Thishigh-

performance, doubleshielded,polyethylene jacketed cableis

speciallydesignedtoprovide thepropersignalshielding forthe

sensorusedinthissystem. Nosubstitutionscan be made.

Substituted cablesmaycauseproblemswithsystemperformance

OMEGACDE-45P ConductivitySensorPart 2– Installation

O&MManual

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Figure2-3Wiring Diagram, CDE-45PSensorand CDTX-45Monitor/Analyzer

Notes:1. Voltagebetween Terminals11 and12 MUSTbe between 16 and 35 VDC.

2. EarthgroundintoTerminal14 isSTRONGLYrecommended. Thisconnection

can greatlyimprovestabilityinelectricallynoisy environments.

OmegaCDE-45PConductivitySensorPart 3–Maintenance&Troubleshooting

O&MManual

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Part 3–SensorMounting

3.1 CleaningtheSensor

Keep the sensorasclean aspossibleforoptimummeasurement

accuracy.Frequency ofcleaning dependsupon the process

solution.

Note: Mechanicalcleaning ofthe electrode surfacesmayharm

measurement qualityif not performed withcare. DoNOTuse

wirebrushes,sandpaperand the liketoclean any

conductivityelectrode.

Wipe the measuringend of the sensorwithacleanwithacleansoft

cloth.Then rinsewithcleanwater(distilled orde-ionized if

possible). Thisshouldremovemost contaminatebuildup.

If necessary,soakthe sensorforseveralminutesinamildsoap

solution. Useasmall,extra-softbristlebrush(suchasamushroom

brush)tothoroughlyclean theelectrodesurfaces.If surface

depositsarenotcompletelyremoved afterperforming thisstep,a

diluteacidmaybe used todissolvethe deposits.Soakforafew

minutes,and then rinsethe sensorthoroughlywithclean water

(distilledorde-ionized if possible).

Note: DO NOTsoakthe sensorindiluteacidsolutionformore

than 5minutes.

WARNING:ACIDSAREHAZARDOUS. Always weareyeand

skinprotection when handling.FollowallMaterialSafetyData

Sheetrecommendations.Ahazardouschemicalreaction can be

created when certainacidscomeincontactwithprocess

chemicals.Makethisdetermination beforecleaning withanyacid,

regardless ofconcentration.DONOT useHydrochloricAcidon

anystainless steelportion of the sensor.

Aftercleaning the sensor,check measurementand re-calibratethe

sensor.

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