5-3
EN
TABLE 5-2. Analog Transmitter Troubleshooting Symptoms and Corrective Actions.
Low Output or
No Output
Impulse Piping • Check for leaks or blockage in the impulse line.
• Check to ensure that the blocking valve is fully open.
• Check for trapped gas in a liquid line, or trapped liquid
in a gas line.
• Check to ensure that the density of the fluid in the
impulse line is unchanged.
• Check for sediment in the transmitter process
connection. If you find sediment, flush the process
connection clean with water or an appropriate solvent.
Do not attempt to scrape sediment free; doing so
could puncture the thin isolating diaphragm and destroy
the transmitter.
• Check for frozen process fluid in the process connector.
Loop Wiring • Check test equipment.
• Check for adequate voltage to the transmitter.
• Check the current rating of the power supply against the
total current being drawn by all transmitters being
powered.
• Check for intermittent shorts, open circuits, and multiple
grounds.
• Check for proper polarity at the signal terminals.
• Check the loop impedance.
Electronics • Replace the electronics board and recalibrate the
transmitter.
Other Components • Replace the transmitter.
Symptom
Potential Source
Corrective Action
High Output Impulse Piping • Check for blockage in the impulse line..
• Check to ensure that the blocking valve is fully open.
• Check for trapped gas in a liquid line, or trapped liquid in
a gas line.
• Check to ensure that the density of the fluid in the
impulse line is unchanged.
• Check for sediment in the transmitter process
connection. If you find sediment, flush the process
connection clean with water or an appropriate solvent.
Do not attempt to scrape sediment free; doing so
could puncture the thin isolating diaphragm and destroy
the transmitter.
• Check for frozen process fluid in the process connector.
Power Supply • Check the output voltage of the power supply at the
transmitter.
(1)
Output Electronics • Replace the output board and recalibrate the transmitter.
Other Components • Replace the transmitter.
Symptom
Potential Source
Corrective Action
TABLE 5-1. (continued).Smart Transmitter Troubleshooting and Corrective Actions.
4690.bk : 4690.s5 Page 3 Tuesday, May 26, 1998 5:28 PM
