FCA‐22InstructionManual
Page19
pHSensor
When used in clean water, pH sensors require little maintenance. pH sensors do require periodic
calibrationduetodriftinthereferenceelectrodeasitages.ThisagingcausesthedisplayedpHvalueto
behigherthanthetruepHofthesample.
Check the sensor on a monthly basis, recalibrate if necessary. Clean or replace the pH sensor when it
becomesnoisyandslowtorespond.
Ifthe sensorneedscleani
ngthenitcan besoakedin adilute solutionofHCl,1‐5%,for 10‐30minutes.
This will remove scale or biofilms from the sensor, rinse well and soak in pH 4 buffer for 15 minutes
beforereturningthesensortoservice.
Cons
tantHeadFlowController(CHFC)
The CHFC is designed to provide a constant flow to the Free Chlorine Sensor (FCS) independent of
variations in the sample pressure. Decreasing the sample flow to the FCS will lower the ou
tput of the
FCS. In most clean water applications the CHFC requires no maintenance.The vertical position of the
centraltubesetstheHeadPressureofthesystem.Itissetforoptimalflowbutlowerflowratescanbe
attainedbyadjustingitsheight.
On a monthly basis visually inspect th
e CHFC, the interconnecting tubing and the drain tubing for
obstructions orsediments thatmayreduce theflow.The CHFCand tubing canbe easilydisassembled
and cleaned with soap and water. Some dirty applications like Cooling Towers may require periodic
cleaningduetosediments.
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