
17
Reference Manual
00809-0100-4803, Rev DA
Section 5: Troubleshooting
April 2013
Troubleshooting
Note
The following performance limitations may inhibit efficient or safe operation. Critical
applications should have appropriate diagnostic and backup systems in place.
Pressure transmitters contain an internal fill fluid. It is used to transmit the process pressure
through the isolating diaphragms to the pressure sensor module. In rare cases, oil loss paths in
oil-filled pressure transmitters can be created. Possible causes include: physical damage to the
isolator diaphragms, process fluid freezing, isolator corrosion due to an incompatible process
fluid, etc.
A transmitter with oil fill fluid loss may continue to perform normally for a period of time.
Sustained oil loss will eventually cause one or more of the operating parameters to exceed
published specifications as the operating point output continues to drift. Symptoms of
advanced oil loss and other unrelated problems include:
• Sustained drift rate in true zero and span or operating point output or both
• Sluggish response to increasing or decreasing pressure or both
• Limited output rate or very nonlinear output or both
• Change in output process noise
• Noticeable drift in operating point output
• Abrupt increase in drift rate of true zero or span or both
• Unstable output
• Output saturated high or low.
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