10/16
Form 924 (05.18) ©SOR Inc.
Sensor Replacement
Disconnect power to the unit.
Remove the housing cover.
Remove two screws holding bracket to plastic holder.
Slide out PC board to expose the sensor connection.
Disconnect the sensor wire.
Unscrew the sensor from the housing.
Apply thread sealant to the male threads of the new sensor.
Thread the new sensor into the bottom of the housing.
Connect the sensor wire to the “probe” connection on the circuit board.
Slide the PC board into the grooves in the plastic ring inside the housing.
Replace the two screws in the circuit board
Reconnect power and replace the housing cover.
Replacement Sensors
See Form 1100 RF Catalog for replacement sensor model numbers
Troubleshooting
Symptom/Problem
Possible Cause
Corrective Action
No LEDS lit
1. Power supply turned off
2. Improperly wired line power
3. Broken power supply wire
4. Blown fuse
5. Blown varistor
1. Check power supply source
2. check terminal block wiring
3. Check wiring integrity
4. Replace fuse F1
5. Replace varistor VR1, VR2
or VR3
LVL LED remains lit
at all times
1. Probe wire touched housing or
other ground
2. Setpoint is at the lowest level
1. Check probe that probe wire is
properly attached to the probe
2. Turn the LEVEL adjustment
counterclockwise and retry
LVL LED operates
properly, but relay
does not respond
1. Relay contact damage
2. Burned or broken circuits
1. Replace circuit board or relay
2. Replace circuit board
Process material
is not detected
1. Sensitivity is improperly set
2. Highly conductive product
3. Heavy conductive build-up
on the sensor
4. Circuit failure
1. Recalibrate per page 6
instructions
2. Use sheathed sensor
3. Use sheathed sensor and
periodically remove the build-up
4. Replace circuit board
If corrective action is not effective, please consult the factory.
NOTE: Agency certifi ed units, (FM, CSA, IEC) must be returned to SOR for repairs.