Level limit switch
Series RF 3000
Technical Information / Instruction manual
page
Troubleshooting
Checking probe wiring
Probe
Shield
Ground
1. Clean the probe from material
2. Take out the electronic board and remove internal wires
(see chapter "Maintenance")
3. Check with Multimeter as follows (see drawing):
Less than 5 Ohm must be present between:
• Wire orange and Probe
• Wire yellow and Shield
• Wire green/ yellow and Ground
More than 1 MOhm resistance must be present between:
• Wire orange and wire yellow
• Wire orange and wire green/ yellow
If other values are present, the probe or probe wiring is
defect.
Situation
Behavoiur of the electronic Possible Reason
Possible Solution
Signal output states
coverered while
material is below the
probe
The actual measured
capacitance (1) is more
than the actual calibrated
Switchpoint uncovered ->
covered (2)
Unit not properly calibrated
• Recalibrate (4)
Excessive material build up on
active probe
• Increase distance to wall (longer inactive
length)
• Change position
• Recalibrate with less sensitivity (4)
Defect or incorrect probe
wiring.
• Check probe wiring (see below)
Signal output states
uncoverered while
material is above the
probe
The actual measured
capacitance (1) is less
than the actual calibrated
Switchpoint covered ->
uncovered (3)
Calibration was done with
covered probe
• Recalibrate with uncovered probe (4)
Calibrated was done with too
less sensitivity
• Recalibrate with higher sensitivity (4)
• Increase active probe length and
recalibrate (4)
Defect or incorrect probe
wiring.
• Check probe wiring (see below)
(1) Value can be seen in the display in Measurement mode (see page 23)
(2) Value can be seen in Advanced Menu, item P (see page 31)
(3) Value can be seen in Advanced Menu, item N (see page 31)
(4) See calibration guide, page 25 or 32
General items
orange (probe)
yellow (shield)
green/yellow (ground)
RFnivo
®
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RF 3000 f
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