Process device diagnostics using process variable sensor signal
AssigneeRosemount Inc.
InventorsEvren Eryurek, Kadir Kavaklioglu, Steven R. Esboldt
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Abstract
A diagnostic device for use in a process control system receives a sensor signal related to a process variable of a process sensed by a process variable sensor. A signal preprocessor provides a sensor power signal output as a function of a frequency distribution of power in the sensor signal. A process condition is determined based upon the sensor power signal.
Claims41
A diagnostic device for use in a process control system which includes a process device used to control the process, comprising:
- a sensor signal input, the sensor signal related to a process variable of a process fluid of a process, the process variable sensed by a process variable sensor;
- a signal preprocessor coupled to the sensor input having a sensor power signal output as a function of a frequency distribution of power in the sensor signal;
- and
- a signal evaluator coupled to the sensor power signal output having a process device condition output related to an operation condition of the process device of the process control system.
A diagnostic method performed in a process control environment which includes a process device used to control the process, the method comprising:
- obtaining a process variable sensor signal;
- determining a frequency distribution of power in the process variable sensor signal;
- and
- evaluating the frequency distribution of power in the process variable sensor signal and providing a process device condition output related to an operation condition of the process device of the process control system.
A computer-readable medium having stored thereon instructions executable by a microprocessor system in a diagnostic device to diagnose condition of a process which includes a process device used to control the process, the instructions comprising:
- obtaining a process variable sensor signal;
- determining a frequency distribution of power in the process variable sensor signal;
- and
- evaluating the frequency distribution of power in the process variable sensor signal and providing a process device condition output related to an operation condition of the process device of the process control system.
A diagnostic device for use in a process control system which includes a process device used to control the process, comprising:
- a sensor signal input, the sensor signal related to a process variable of a process fluid of a process, the process variable sensed by a process variable sensor;
- signal preprocessing means for determining a frequency distribution of power in the sensor signal;
- and
- signal evaluating means for diagnosing a process device operation condition of the process device of the process control system based upon the frequency distribution of power in the sensor signal.
Dependencies are inferred from the claim text.