00809-0100-
5-17
Table 5-3 – Troubleshooting
Symptom Potential Source Corrective Action
High Output
Primary Element
Check for restrictions at primary element, improper installation or poor
condition. Note any changes in process fluid properties that may affect
Impulse Piping
Check for leaks or blockage.
Ensure blocking locking valves are fully open.
Check for entrapped gas in liquid lines, or liquid in dry lines.
Ensure that density of fluid in impulse line is unchanged.
Check for sediment in transmitter process flanges.
Transmitter
Electronics
Make sure that filter pins and the sensor module connections are
clean. If the electronics are still suspect, substitute new electronics.
Transmitter
Electronics Failure
Determine faulty circuit board by trying spare electronics assembly or
terminal block assembly. Replace faulty assembly.
Sensor Module
NOTE: See Sensor Module Checkout section. The sensing element
is not field repairable and must be replaced if found to be defective.
See Disassembly Procedure for instructions on disassembly. Check
for obvious defects (i.e. punctured isolating diaphragm, etc.) and
contact Rosemount Nuclear Instruments, Inc.
Power Supply Check the power supply output voltage at the transmitter.
Low Output
or No
Output
Primary Element
Check the insulation and condition of primary element.
Note any changes in process fluid properties that may affect output.
Loop Wiring
Check for adequate voltage to the transmitter.
Check the milliamp rating of the power supply against the total current
being drawn for all transmitters being powered.
Check for shorts and multiple grounds.
Check for proper polarity at the signal terminal.
Check loop impedance.
Check wire insulation to detect possible shorts to ground.
Do not use more than 55 volts to check the loop, or damage to the
transmitter electronics may result.
Impulse Piping
Ensure that the pressure connection is correct.
Check for leaks or blockage.
Check for entrapped gas in liquid lines, or liquid in dry lines.
Check for sediment in transmitter process flanges.
Ensure that blocking valves are fully open and that bypass valves are
tightly closed.
Ensure that density of fluid in the impulse line is unchanged.
Transmitter
Electronics
Connections
Ensure that calibration adjustments are in allowable range.
Check for short in sensor leads.
Make sure filter pins are clean, and check the sensor module
connections.
If the electronics are still suspect, substitute new electronics.
Continued on Next Page
Test Diode Failures Replace terminal block.
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