SOR Single Point RF Level Switch - Manual (Page 10)

10/12 Form 830 (03.13) ©SOR Inc.
Troubleshooting
Symptom/Problem Possible Cause Corrective Action
LED will not illuminate,
even at maxmum
sensitivity setting (full
clockwise 25 turns) 1. Antenna banana plug loose
or disconnected.
2. No power to circuit.
3. Blown fuse.
4. Faulty sensing circuit.
1. Plug antenna banana plug
securely into sensor jack.
2. Check voltage at terminal block
as appropriate.
L1 N 95-130 VAC
L1 L2 195-250 VAC
+ - 24 + 10% VDC
+ - 12 + 1 0% VDC
3. Replace line fuses F1 and F2.
4. Replace PC board.
LED remains
illuminated, even at
minimum sensitivity
setting (full
counterclockwise
25 turns) 1. Antenna lead unplugged
and touching housing or other
ground.
2. Antenna is shorted to case
or ground. 1. Clean banana plug and insert
into sensor jack.
2. Ensure that bare end of antenna
is not touching any metal part.
Remove P1 if LED goes dark.
Clean, repair or replace sensor
assembly.
LED remains
illuminated and goes
out, but output relay
is inoperative. 1. Bad driver transistor.
2. K1 relay contact
damage.
3. Burned or broken lands
terminal feed through K1.
1. Move JP1 to other position. If
relay operates normally, replace
PC board.
2. Check condition of relay
contacts and max load of external
switched circuit.
3. Replace K1 relay or PC board.
Device will not detect
process material. 1. Sensitivity improperly set.
2. Highly conductive product.
3. Heavy conductive product
build-up on sensor. 1. Recalibrate according to
Pre-Installation I/O Test and
Calibration instructions on Page 1.
2. Use sheathed sensor.
3. Use sheathed sensor and
periodically remove build-up.
Calibration drifts 1. Widely varying dielectric due
to changing process material.
2. Highly conductive product.
3. Heavy conductive product
build-up on sensor. 1. Recalibrate according to
Pre-Installation I/O Test and
Calibration instructions on Page 1.
2. Use sheathed sensor.
3. Use sheathed sensor and
periodically remove build-up.
Corroded sensor Process material has
chemically attacked sensor. Use coated or sheathed sensor to
provide corrision 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.