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Reference Manual
00809-0100-4514, Rev BA
January 2008
Rosemount 1154
5-10
Low Output or
No Output
Primary Element Check for restrictions at primary element, improper installation or poor condition.
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.
Impulse Piping Ensure that the pressure connection is correct.
Check for leaks or blockage.
Check for entrapped gas in liquid lines.
Check for sediment in the transmitter process flange.
Ensure that blocking valves are fully open and that bypass valves are tightly closed.
Ensure that density of the fluid in the impulse piping is unchanged.
Transmitter
Electronics
Connections
Ensure that calibration adjustments are in allowable range.
Check for shorts in sensor leads.
Make sure post connectors are clean, and check the sensor connections.
If the electronics are still suspect, substitute new electronics.
Test Diode Failure Replace electronics housing.
Transmitter
Electronics Failure
Determine faulty circuit board by trying spare boards. Replace faulty circuit board.
Sensing Module NOTE: See Sensing 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, such as a punctured isolating diaphragm or fill
fluid loss, and contact Rosemount Nuclear Instruments, Inc. at (952) 949-5210.
Power Supply Check the power supply output voltage at the transmitter.
Erratic Output Loop Wiring
Check for inadequate voltage to the transmitter.
Check for intermittent shorts, open circuits, or multiple grounds.
Impulse Piping and
Process
Connections
Check for entrapped gas in liquid lines, or liquid in dry lines.
Transmitter
Electronics
Check for intermittent shorts or open circuits.
Make sure that bayonet and sensor connectors are clean and properly connected.
Transmitter
Electronics Failure
Determine faulty circuit boards by trying spare boards. Replace faulty circuit board.
Power Supply Check power supply output voltage.
Symptom Potential Source Corrective Action
Do not use over 100 volts to check the loop, or damage to the transmitter
electronics may result.
Do not use over 100 volts to check the loop, or damage to the transmitter
electronics may result.