Reference Manual
00809-0100-4360, Rev BA
August 2008
Rosemount 1151
5-10
ANALOG
TROUBLESHOOTING
Hardware Diagnostics If you suspect a malfunction, see Table 5-2 on page 5-10 to verify that
transmitter hardware and process connections are in good working order.
Under each of the five major symptoms, you will find specific suggestions for
solving the problem. Always deal with the most likely and easiest to check
conditions first.
Table 5-2. Troubleshooting
Symptoms and Corrective
Action.
Isolate a failed transmitter from its pressure source as soon as possible. Pressure that
may be present could cause death or serious injury to personnel if the transmitter is
disassembled or ruptures under pressure.
Symptom Potential Source Corrective Action
High Output Primary Element
Impulse Piping
Check for restrictions at primary element.
Check for leaks or blockage.
Ensure that blocking valves are fully open.
Check for entrapped gas in liquid lines and for liquid in dry lines.
Ensure that the density of fluid in impulse lines in unchanged.
Check for sediment in transmitter process flanges.
Power Supply Check the power supply output voltage at the transmitter.
Transmitter electronics Make sure that post connectors are clean.
If the electronics are still suspect, substitute 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.
Erratic Output Loop Wiring Check for adequate voltage to the transmitter.
Check for intermittent shorts, open circuits and multiple grounds.
Process Pulsation Adjust Damping
Transmitter Electronics Make sure the post connectors are clean.
If the electronics are still suspect, substitute new electronics.
Impulse Piping Check for entrapped gas in liquid lines and for liquid in dry lines.
Do not use higher than the specified voltage to check the
loop, or damage to the transmitter electronics may result.
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