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pH Sensor Error
This error message is caused by the signal from the pH electrode being outside of the normal range
(pH less than –2 or greater than 16, or input voltage outside –1.45 VDC to +1.45 VDC). Any relay
being controlled by the sensor will be forced off.
Possible
Causes
Corrective
Actions
Faulty pH cartridge.
Replace cartridge.
Faulty pH electrode wiring.
Make sure that the electrode cartridge is firmly
screwed into the housing. Make sure that there
is no water inside the housing. Make sure that
the +/- 5 VDC and the IN-, IN+ wires are
firmly attached. Also make sure that the sensor
cable is not routed near any AC voltage wiring.
Make sure that the cable is properly shielded.
Faulty preamplifier housing.
If the controller passes self test, the wiring is
correct, the +/- 5 VDC signal is present and
the cartridge is attached and OK, replace the
housing.
Faulty sensor input circuit board.
Go to the pH Input Menu and perform a self
test. If it fails, remove the electrode wires
from the pH input board and try the self
test again. If it passes, the problem is in the
electrode, housing or its wiring. If it still fails,
replace the pH input board.
ORP Sensor Error
This error message is caused by the signal from the ORP electrode being outside of the normal
range (-1450 to 1450 mV). Any relay being controlled by the sensor will be forced off.
Possible
Causes
Corrective
Actions
Faulty ORP cartridge.
Replace cartridge.
Faulty ORP electrode wiring.
Make sure that the electrode cartridge is firmly
screwed into the housing. Make sure that there
is no water inside the housing. Make sure that
the +/- 5 VDC and the IN-, IN+ wires are
firmly attached. Also make sure that the sensor
cable is not routed near any AC voltage wiring.
Make sure that the cable is properly shielded.
Faulty preamplifier housing.
If the controller passes self test, the wiring is
correct, the +/- 5 VDC signal is present and
the cartridge is attached and OK, replace the
housing.
Faulty sensor input circuit board.
Go to the ORP Input Menu and perform a self
test. If it fails, remove the electrode wires
from the ORP input board and try the self test
again. If it passes, the problem is in
the electrode, housing or its wiring. If it still
fails, replace the ORP input board.