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Troubleshooting
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 adequate 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 the Calibration Section above. If these conditions are met and problems still exist use the
Troubleshooting Table to find a remedy.
Troubleshooting Guide
Symptom
Displayed value is Higher
than DPD test value.
Displayed value is Lower than
DPD test value
Possible Cause
Insufficient Polarization time
Damaged Membrane Cap
pH indication higher than
actual value
Temperature indication lower
than actual value
Electrical short or wet
connection inside the sensor
or cable assembly
Chloramine or other oxidants
present in sample yielding a
high DPD test.
Coated or dirty membrane
Page 20
FCA‐22 Instruction Manual
Remedy
Polarize FCS for full 90
minutes before calibration.
Replace Membrane Cap
Calibrate pH sensor or adjust
value on uncompensated FCA
Calibrate the Temperature
(see Calibration) The
temperature sensor lags the
process temperature wait for
temperature equilibrium.
Remove measuring chamber
and dry the cathode surface, if
the indication does not go to
zero there is leakage. Replace
the sensor.
Replace water and chlorinate
Clean or replace the
membrane
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