Walchem WebMaster - The Disinfectant Reading Is Much Higher than the Manual Analysis; Sensor Error; Disinfectant Reading Is Unstable

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The disinfectant reading is much higher than the manual
analysis
Possible Causes
Corrective Actions
Insufficient conditioning
Wait for the appropriate amount of time
before attempting a calibration.
Faulty membrane
Replace membrane cap.
Faulty sensor
Replace sensor
Faulty analysis equipment or
reagents
Consult test equipment instructions
Sample contaminated with
interfering molecule (refer to
Sensitivity specification in
Section 6)
Remove source of contamination
Sensor Error
This error message appears if the signal from the sensor is outside the range
of –1400 to 1400 mVDC (WebMaster) or –2000 to 2000 (WDIS) or -2560
to 60 mV (W100/W600/900)
Possible Causes
Corrective Actions
Faulty wiring
Check wiring
Faulty sensor
Replace sensor
Faulty controller sensor input
Go to the Sensor Input menu and perform a self
test. If this passes, then the problem is with the
sensor or its wiring. If it fails, then disconnect
the sensor from the circuit board and try the
self test again. If it still fails, replace the circuit
board.
Disinfectant Reading is Unstable
Possible Causes
Corrective Actions
Air bubbles on membrane
Dislodge bubbles. Adjust flow rate higher if
necessary.
Air bubbles in electrolyte
Refill membrane cap with electrolyte.
Faulty membrane
Replace membrane cap.
Faulty wiring
Check wiring
Faulty controller sensor input
Go to the Sensor Input menu and perform a self
test. If this passes, then the problem is with the
sensor or its wiring. If it fails, then disconnect
the sensor from the circuit board and try the
self test again. If it still fails, replace the circuit
board.