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Reference Manual
00809-0100-4665, Rev AA
August 2010
Rosemount 8732
C-4
Troubleshooting Empty
Pipe
The following actions can be taken if Empty Pipe detection is unexpected.
1. Verify the sensor is full.
2. Verify that the sensor has not been installed with a measurement
electrode at the top of the pipe.
3. Decrease the sensitivity by setting the Empty Pipe Trigger Level to a
value above the Empty Pipe Value read with a full pipe.
4. Decrease the sensitivity by increasing the Empty Pipe Counts to
compensate for process noise. The Empty Pipe Counts is the number
of consecutive Empty Pipe Value readings above the Empty Pipe
Trigger Level required to activate the Empty Pipe alert. The count
range is 5-50, with factory default set at 5.
5. Increase process fluid conductivity above 50 microsiemens/cm.
6. Properly connect the wiring between the sensor and the transmitter.
Corresponding terminal block numbers in the sensor and transmitter
must be connected.
7. Perform the sensor electrical resistance tests. Confirm the resistance
reading between coil ground (ground symbol) and coil (1 and 2) is
infinity, or open. Confirm the resistance reading between electrode
ground (17) and an electrode (18 or 19) is greater than 2 kohms and
rises. For more detailed information, consult Table 6-5 on page 6-8.
GROUND/WIRING FAULT
DETECTION
The Ground/Wiring Fault Detection diagnostic provides a means of verifying
installations are done correctly. If the installation is not wired or grounded
properly, this diagnostic will activate and deliver a PlantWeb alert. This
diagnostic can also detect if the grounding is lost over-time due to corrosion or
another root cause.
Turning Ground/Wiring Fault On/Of
The Ground/Wiring Fault diagnostic can be turned on or off as required by the
application. If the advanced diagnostics suite 1 (D01 Option) was ordered,
then the Ground/Wiring Fault diagnostic will be turned on. If D01 was not
ordered or licensed, this diagnostic is not available.
Ground/Wiring Fault
Parameters
The Ground/Wiring Fault diagnostic has one read-only parameter. It does not
have any configurable parameters.
Line Noise
Reads the current amplitude of the Line Noise. This is a read-only value. This
number is a measure of the signal strength at 50/60 Hz. If the Line Noise
value exceeds 5 mV, then the Ground/Wiring Fault diagnostic alert will
activate.