ECD FCA-22 - Troubleshooting Guide; Troubleshooting

FCA‐22InstructionManual
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Page20
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Troubleshooting
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The FCA‐22 was evaluated and  calibrated at the factory before shipment. Upon initial start up the
systemshouldrequireminimaltonoadjustments.
Verify the system has ade quate flow, greater than 10 gals /hr, the pH electrode and the temperature 
sensor arereadingcorrectly. These parameters effect the measurementand must meet the standards
listed in th
e Calibration Section above. If these conditions are met and problems still exist use the
TroubleshootingTabletofindaremedy. 
TroubleshootingGuide
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Symptom PossibleCause Remedy
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DisplayedvalueisHigher
thanDPDtestvalue.
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InsufficientPolarizationtime
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DamagedMembraneCap
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pHindicationhigherthan
actualvalue
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Temperatureindication lower
thanactualvalue
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Electricalshortorwet
connectioninsidethesens or
orcableassembly
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PolarizeFCSforfull90
minutesbeforecalibration.
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ReplaceMembraneCap
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CalibratepHsensororadjust
valueonun
compensatedFCA
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CalibratetheTemperature
(seeCalibration)The
temperaturesensorlagsthe
processtemperaturewaitfor
temperatureequilibrium.
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Removemeasuringchamber
anddrythecathodesurface,if
theindicationdoes notgoto
zerothereisleakage.Replace
thesensor.
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DisplayedvalueisLowerthan
DPDtestvalue
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Chloramineorotheroxidants
presentinsampleyieldinga
highDPDtest.
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Coatedordirtymembrane
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Replacewaterandchlorinate
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Cleanorreplacethe
membrane
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