Reference Manual
00809-0100-4360, Rev BA
August 2008
5-11
Rosemount 1151
Symptom Potential Source Corrective Action
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 whether the transmitter is in multidrop mode, thus locking the output at
4 mA.
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.
Sensing Element The sensing element is not field repairable and must be replaced if found to be
defective. See “Transmitter Disassembly” later in this section for instructions
on disassembly. Check for obvious defects, such as punctured isolating
diaphragm or fill fluid loss, and contact your local Emerson Process
Management representative.
Transmitter Does Not
Calibrate Properly
Pressure
Source/Correction
Check for restrictions or leaks.
Check for proper leveling or zeroing of the pressure source.
Check weights/gauge to ensure proper pressure setting.
Determine if the pressure source has sufficient accuracy.
Meter Determine if the meter is functioning properly.
Power Supply Check the power supply output voltage at transmitter.
Transmitter Electronics Make sure the post connectors are clean.
If electronics are still suspect, substitute with new electronics.
Sensing Element The sensing element is not field repairable and must be replaced if found to be
defective. See “Transmitter Disassembly” later in this section for instructions
on disassembly. Check for obvious defects, such as punctured isolating
diaphragm or fill fluid loss, and contact your local Emerson Process
Management representative.
Do not use higher than the specified voltage to check the loop, or
damage to the transmitter electronics may result.
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