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Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
C-4
Example
Set the counts to 10
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 set the Empty Pipe diagnostic. 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 6-6 on page 6-9.
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/Off
The Ground/Wiring Fault diagnostic can be turned on or off as required by the
application. If the advanced diagnostics suite 1 (DA1 Option) was ordered,
then the Ground/Wiring Fault diagnostic will be turned on. If DA1 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.
HART Fast Keys
1, 2, 1, 3
LOI Key
AUX. FUNCTION
AMS Tab
Diagnostics
HART Fast Keys
1, 2, 4, 3
LOI Key
XMTR INFO
AMS Tab
Diagnostics
Summary of Contents for 8712
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