115
Reference Manual
00809-0100-4803, Rev GA
Troubleshooting
September 2017
Troubleshooting
Symptom
Corrective action
Erratic PV Reading
Primary element
•
Check the installation and condition of the primary element.
Loop wiring
•
Check for adequate voltage to the transmitter. It should be 12 to 42.4 Vdc for HART with no load at the transmitter
terminals.
•
Check for intermittent shorts, open circuits, and multiple grounds.
Process pulsation
•
Adjust the damping.
Feature board electronics
•
Connect a personal computer and use AMS Device Manager, Engineering Assistant Software, or the Field
Communicator to check the sensor limits to ensure calibration adjustments are within the sensor range and that
calibration is correct for the pressure being applied.
•
Confirm the electronics housing is properly sealed against moisture.
•
If the feature board electronics are still not functioning properly, substitute new feature board electronics.
Impulse piping
•
Check for entrapped gas in liquid lines or for liquid in gas lines.
•
Make sure that process fluid has not frozen within the process flange.
•
Ensure that block valves are fully open and equalize valves are fully and tightly closed.
Sensor module
•
The sensor module is not field repairable and must be replaced if found to be defective. Check for obvious defects,
such as a punctured isolating diaphragm or fill fluid loss, and contact your nearest Emerson Service Center.
Low PV Reading or No
PV Reading
Primary element
•
Check the installation and condition of the primary element.
Note any changes in process fluid properties that may affect output.
Loop wiring
•
Check for adequate voltage to the transmitter. It should be 12 to 42.4 Vdc for HART with no load at the transmitter
terminals.
•
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 the wire insulation to detect possible shorts to ground.
Impulse piping
•
Check to ensure the pressure connection is correct.
•
Check for leaks or blockage.
•
Check to ensure blocking valves are fully open and that bypass valves are tightly closed.
•
Check for entrapped gas in liquid lines or for liquid in gas lines.
•
Check for sediment in the transmitter process flange.
•
Make sure process fluid has not frozen within the process flange.
Table 5-4. Unexpected Process Variable (PV) Readings
Содержание 3051S Series
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