Walchem WebMaster Instruction Manual download pdf (Page 121)

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Faulty sensor option circuit board. Go to the ORP Input Menu and perform a self

test. If it fails, remove the electrode wires

from the ORP input option board and try the

self test again. If it passes, the problem is in t

he electrode, housing or its wiring. If it still

fails, replace the ORP input option board.

Temperature Sensor Error (system or makeup)

This error message is caused by the temperature signal being outside the normal range (around

1500-33,000 ohms for contacting sensors, 15,000 to 330,000 for electrodeless sensors). The bleed

relay will be forced off.

Possible Causes Corrective Actions

Faulty temperature sensor wiring Measure the temperature signal using an

(part of the system conductivity sensor). ohmmeter between the green wire and the

green/white wire as close to the sensor as

possible, with the wires disconnected from the

terminal strip. This should be around 8,000

ohms at 85 F, 30 C for a contacting electrode

and 80,000 ohms for an electrodeless sensor.

If OK, check this again at the terminal strip of

the circuit board. If OK, make sure that the

wires are connected firmly to the correct

terminals.

Faulty conductivity sensor. If you measure resistance outside the

acceptable range directly from the sensor,

replace the sensor.

Faulty sensor interface Go to the Conductivity Input Page and

(if system conductivity) or sensor option perform a self test. If this passes, then the

(if makeup conductivity) circuit board. 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.

Conductivity sensor calibration time (system or makeup)

Normal condition; programmed calibration reminder time has elapsed

pH sensor calibration time

Normal condition; programmed calibration reminder time has elapsed

ORP sensor calibration time

Normal condition; programmed calibration reminder time has elapsed

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Walchem WebMaster Instruction Manual Page 121