SOR Single Point RF Level Switch - Manual (Page 11)

Form 759 (03.13) SOR Inc. 11/16
Sympton/Problem Possible Cause Corrective Action
LED stays illuminated,
even at maximum
sensitivity setting (full
clockwise 25 turns). 1. Banana plug is loose or
disconnected
2. Probe lead is shorted to
case or ground
3. Faulty sensing circuit 1. Plug banana plug
securely into sensor
jack.
2. Check that the bare end
of the probe is not
touching any metal
part. Clean, repair or
replace the sensor
assembly.
3. Call the factory.
LED stays off, even at
minimum sensitivity
setting (full counter-
clockwise, 25 turns). No power to the circuit or
excessive loop resistance. Check the voltage at the
terminal block. It should
be a minimum of 12V.
Device will not detect
process material. 1. Bad circuit switch
2. The oscillator is not
working Call the factory.
Calibration drifts 1. Sensitivity improperly set
2. Highly conductive
product
3. Heavy conductive
build-up on the sensor 1. Recalibrate according to
Post-Installation
Calibration Instructions
on page 3.
2. Use sheather sensor.
3. Use sheather sensor and
periodically remove
build-up.
Corroded sensor Process material has
chemically attacked sensor Use sheather sensor to
provide corrosion
resistance.
Eroded or abraded
sensor Fast flowing or agitated
process has physically
attacked sensor. Consider other sensor
material or design,
relocating sensor or a
stilling well in liquid
process.
Output current exceeds
23 mA Bad current switch Call the factory.
Output current is below
3.5 mA The oscillator is not
working. Call the factory.
NOTE: Agency certifi ed units, (FM, CSA, IEC) must be returned to SOR for repairs.
Troubleshooting