Walchem WebMaster ONE Instruction Manual page 176

Temperature calibration, high/low alarm menus missing from Sensor Input page
The controller not detecting the temperature sensor at power up causes this problem.
Possible Causes
The temperature sensor is not connected.
Faulty temperature sensor.
Sensor input is selected to be an ORP type
Link to 4-20 mA Output page does not appear
The controller not detecting any 4-20 mA output boards at power up causes this problem.
Possible Causes
No 4-20 mA output boards are installed.
Poor connection of the 4-20 mA output
board.
Link to Level page does not appear
The controller not detecting either a digital input board or an analog input board at power up
causes this problem.
Possible Causes
No digital or analog input board is installed.
Poor connection of the option board.
Link to Digital Inputs page does not appear
The controller not detecting a digital input board at power up causes this problem.
Possible Causes
No digital input board is installed.
Poor connection of the option board.
Corrective Actions
Connect the temperature sensor and
turn power on.
Measure the temperature signal using an
ohmmeter between the green wire and the
WHT/GRN wire as close to the sensor as
possible with the wires disconnected from
the terminal strip. If the reading is infinite
ohms, replace the sensor.
This is normal. ORP inputs do not use automatic
temperature compensation.
Corrective Actions
Install one or more 4-20 mA output boards
and turn power on.
Remove the option board and inspect both
mating connectors for corrosion or damage
Reinstall the option board on turn power on.
Corrective Actions
Install the desired option board and turn
power on.
Remove the option board and inspect both
mating connectors for corrosion or damage
Reinstall the option board on turn power on.
Corrective Actions
Install the digital input option board and
turn power on.
Remove the option board and inspect both
mating connectors for corrosion or damage
Reinstall the option board on turn power on.
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