PRESSURE TRANSMITTER WITH DIAGNOSTICS
First Claim
1. A pressure transmitter for use in measuring a pressure of a process fluid in an industrial process, comprising:
- a pressure sensor having a pressure output related to the pressure of the process fluid;
measurement circuitry configured to calculate a process variable of the process fluid based upon the pressure output;
diagnostic circuitry configured to diagnose operation of the industrial process based upon a standard deviation; and
standard deviation calculation circuitry configured to calculate a standard deviation based upon the pressure output and reduce an effect of an abrupt change in the pressure output on the calculated standard deviation.
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Accused Products
Abstract
A pressure transmitter for use in measuring a pressure of a process fluid in an industrial process. The pressure transmitter includes a pressure sensor having a pressure output related to the pressure of the process fluid. Measurement circuitry is configured to calculate a process variable of the process fluid based upon the pressure output. Diagnostic circuitry diagnoses operation of the industrial process based upon a process parameter of the pressure output. Process parameter calculation circuitry calculates the process parameter based upon pressure output and reduces the effect of an abrupt change in the pressure output on the calculated process parameter.
17 Citations
30 Claims
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1. A pressure transmitter for use in measuring a pressure of a process fluid in an industrial process, comprising:
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a pressure sensor having a pressure output related to the pressure of the process fluid; measurement circuitry configured to calculate a process variable of the process fluid based upon the pressure output; diagnostic circuitry configured to diagnose operation of the industrial process based upon a standard deviation; and standard deviation calculation circuitry configured to calculate a standard deviation based upon the pressure output and reduce an effect of an abrupt change in the pressure output on the calculated standard deviation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method in a process transmitter of the type used to measure pressure of a process fluid in an industrial process, the method for diagnosing operation of the industrial process comprising:
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receiving a pressure signal from a pressure sensor coupled to the process fluid; calculating a process variable of the process fluid based upon the pressure signal; calculating a standard deviation of the pressure signal and reducing an effecting of an abrupt change on a calculated standard deviation; and diagnosing operation of the industrial process based upon the calculated standard deviation. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A process variable transmitter for use in measuring a process variable pressure of a process fluid in an industrial process, comprising:
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a process variable sensor having a process variable output related to the sensed variable of the process fluid; measurement circuitry configured to measure the process variable of the process fluid based upon the process variable output; diagnostic circuitry configured to diagnose operation of the industrial process based upon a process parameter of the process variable; and process parameter calculation circuitry configured to calculate a process parameter based upon the process variable output and reduce an effect of an abrupt change in the pressure output on the calculated process parameter;
wherein the process parameter is calculated based upon a plurality of individual process parameter calculations calculated using reduced numbers of samples of the process variable output. - View Dependent Claims (27, 28)
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29. A method in a process variable transmitter of the type used to measure process variable of a process fluid in an industrial process, the method for diagnosing operation of the industrial process comprising:
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receiving a process variable signal from a process variable sensor coupled to the process fluid; calculating a process variable of the process fluid based upon the process variable signal; calculating a process parameter of the process variable signal and reducing an effect of an abrupt change on a calculated process parameter, wherein the calculating includes a dividing samples of the process variable sensor output into buckets and calculating a plurality of individual process parameters based upon the buckets, and further including discarding at least one of the individual process parameters calculations; and diagnosing operation of the industrial process based upon the calculated process parameter. - View Dependent Claims (30)
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Specification