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5.1
RF Point Level Troubleshooting Guide
Symptom
Possible Cause
Switch is in alarm and will
Sensor is coated by a conductive material and the
not clear
Cote-Shield™ element does not extend far enough
Fail Safe switch is set to the wrong setting
Active section of sensor is touching an internal
structure or material is bridging active to ground.
Connection cable or harness between unit and
sensor is damaged
Flexible sensor is swaying and active is touching
vessel or structure
Switch stays in alarm for
Material bridging from active to tank structure
extended period after level
falls below sensor
Time delay may be active
Switch does not respond to
There may not be enough active to detect an
material
insulating material
Switch was calibrated with sensor covered by
material
Granular material – Active section is not getting
enough coverage due to angle of repose
Connection cable or harness between unit and
sensor is damaged
Switch delays in
Reverse acting time delay may be active
responding to material
LED's are Flashing
Flashing LED's indicate one of three things.
Over Range / Under Range / fault
Over Range indicates that
A long sensing element may generate too much
the standing capacitance of
standing capacitance to calibrate
the sensing element in the
vessel is to large to allow
calibration
The sensor could be touching an internal tank
structure
Switch was calibrated with sensor covered by
material
Improper wiring connection (Remote Switches)
Under Range indicates
Sensing Element is Disconnected
that the electronic unit
is not seeing enough
capacitance.
Unit is damaged
Fault Indicates the Auto-
Sensing Element is Damaged
Verify feature has detected
a problem.
Center wire to shield short
Connecting Cable is Damaged
Electronic Unit is damaged
Green Power LED is out
Electronic unit is not getting power
Electronic Unit is damaged
Solution
Need a sensor with a longer Cote-Shield
element. Rule of thumb is nozzle length +
into the vessel
expected wall coating + 2 inches.
Check to make sure the fail safe switch is in
the correct position
May be able to shorten sensor (consult
factory) or relocate sensor.
Check connection cable for shorts, opens, or
damage and proper termination
Add 1 or 2 seconds of reverse acting time
delay.
May be able to shorten sensor (consult
factory) or relocate sensor.
Make sure time delay pot is full
counterclockwise.
Change to high sensitivity or adding active
length to sensor
Make sure material level is below sensor
and re-calibrate
Relocate sensor to get more coverage or
lengthen active. Changing to high sensitivity
may also help.
Check connection cable for shorts, opens, or
damage and proper termination
Check time delay settings to make sure they
are correct
Consult instruction manual to determine
which of the three symptoms are
experienced.
Additional capacitance must be added to the
calibration range (padding)
May be able to shorten sensor (consult
factory) or relocate sensor.
Make sure material level is below sensor
and re-calibrate
Check remote cable connections to confirm
they are correct.
Verify sensing element cable connections.
Test cable continuity.
Consult factory
Check Sensing Element for Damaged
Check cable & sensor
Check connection cable for damage, shorts,
and proper termination
Consult factory
Check power source to make sure proper
power is supplied and connections are
correct
Consult factory
25
Troubleshooting
See Section
Section 2.2, 5.4
Section 2.6.3
Appendix A
Section 2.2, 5.4
Section 5.6, 5.5
Section 2.6.2
Appendix A
Section 2.2, 5.4
Section 2.6.2
Consult Factory
Section 4.8, App. A
Section 2.6.7
Appendix A
Section 5.5, 5.6
Section 2.6.2
Section 5.2, 5.3, 2.7
Section 5.7
Consult Factory
Appendix A
Section 2.6.7
Section 2.8
Section 5.5, 5.6
Section 5.7
Section 2.6.6
Section 5.4, 5.5, 5.6
Section 5.5, 5.6
Section 5.7
Section 2.4
Section 5.7
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