Instruction manual

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Faulty conductivity sensor wiring. Make sure that the sensor cable is connected (if

system conductivity) properly, and there are

no shorts in any extension cables. Also make

sure that the sensor cable is not routed near any

AC voltage wiring. Make sure that the cable is

properly shielded.

Faulty conductivity sensor. Replace sensor.

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). The pH

output relay 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.

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 option circuit board. Go to the pH Input Menu and perform a self

test. If it fails, remove the electrode wires f

rom the pH input option 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 option 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). The ORP output relay will be forced off.