Process device diagnostics using process variable sensor signal
First Claim
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1. A diagnostic device for use in a process control system, 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 an isolated signal output comprising signal components in the sensor signal related to operation of the process;
a signal evaluator coupled to the isolated signal output having a condition output related to a condition of the process, the condition of the process different than the process variable; and
wherein the signal preprocessor isolates a frequency range and the signal evaluator compares an amplitude of the isolated frequency range to a threshold level.
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Abstract
Process device diagnostic is provided for diagnosing the condition of a process by receiving a process variable sensor signal. The process variable sensor senses vibration noise signals carried in a process fluid of the process. The vibration noise signals are generated by the process, such as by operation of process control elements. The diagnostics isolates the process noise signals in the process variable sensor signal and evaluates the isolated signal to diagnoses the process and the process devices.
411 Citations
39 Claims
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1. A diagnostic device for use in a process control system, comprising:
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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 an isolated signal output comprising signal components in the sensor signal related to operation of the process;
a signal evaluator coupled to the isolated signal output having a condition output related to a condition of the process, the condition of the process different than the process variable; and
wherein the signal preprocessor isolates a frequency range and the signal evaluator compares an amplitude of the isolated frequency range to a threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A diagnostic method performed in a process control environment, the method comprising:
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obtaining a process variable sensor signal;
isolating a process noise signal in the process variable sensor signal by isolating a frequency range; and
evaluating the isolated signal by comparing an amplitude of the isolated frequency range to a threshold level and providing a condition output related to the process, the condition different than the process variable. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A computer-readable medium having stored thereon instructions executable by a microprocessor system in a diagnostic device to diagnose condition of a process, the instructions comprising:
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obtaining a process variable sensor signal;
isolating a process noise signal in the process variable sensor signal by isolating a frequency range;
evaluating the isolated signal by comparing an amplitude of the isolated frequency range to a threshold level, the condition different than the process variable; and
outputting the process condition in response to the evaluation.
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39. A diagnostic device for use in a process control system, comprising:
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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 isolating signal components in the sensor signal related to operation of the process and providing an isolated signal output;
signal evaluating means for diagnosing a condition of the process, the condition of the process different than the process variable; and
wherein the signal preprocessor isolates a frequency range and the signal evaluator compares an amplitude of the isolated frequency range to a threshold level.
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Specification