Pressure transmitter with diagnostics
First Claim
1. A pressure transmitter adapted to couple to a process fluid to sense pressure, the pressure transmitter comprising:
- a pressure sensor adapted to measure pressure of the process fluid;
an analog to digital converter coupled to the pressure sensor and configured to generate a series of digital representations of pressure of the process fluid;
a microprocessor system configured to receive the series of digital representations of pressure and having;
a first algorithm stored therein calculating a difference between the series of digital representations and a moving average of the series of digital representations, and having a second algorithm stored therein receiving the difference and calculating a trained data set of historical data during a training mode and calculating a current data set during a monitoring mode and generating diagnostic data as a function of the current data set relative to the historical data, the diagnostic data indicative of a condition of a primary element and/or an impulse line; and
an output configured to provide an output related to pressure of the process fluid.
1 Assignment
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Accused Products
Abstract
In one embodiment, a pressure transmitter is provided which diagnoses the condition of a primary element and/or an impulse line which connects to a pressure sensor. A difference circuit coupled to the pressure sensor has a difference output which represents the sensed pressure minus a moving average. A calculate circuit receives the difference output and calculates a trained output of historical data obtained during an initial training time. The calculate circuit also calculates a monitor output of current data obtained during monitoring or normal operation of the transmitter. A diagnostic circuit receives the trained output and the monitor output and generates a diagnostic output indicating a current condition.
166 Citations
82 Claims
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1. A pressure transmitter adapted to couple to a process fluid to sense pressure, the pressure transmitter comprising:
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a pressure sensor adapted to measure pressure of the process fluid;
an analog to digital converter coupled to the pressure sensor and configured to generate a series of digital representations of pressure of the process fluid;
a microprocessor system configured to receive the series of digital representations of pressure and having;
a first algorithm stored therein calculating a difference between the series of digital representations and a moving average of the series of digital representations, and having a second algorithm stored therein receiving the difference and calculating a trained data set of historical data during a training mode and calculating a current data set during a monitoring mode and generating diagnostic data as a function of the current data set relative to the historical data, the diagnostic data indicative of a condition of a primary element and/or an impulse line; and
an output configured to provide an output related to pressure of the process fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A pressure transmitter adapted to couple to a process via an impulse line to sense a pressure of process fluid, the pressure transmitter comprising:
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a pressure sensor adapted to couple to the impulse line;
a measurement circuit coupled to the sensor and generating an output related to sensed pressure;
a difference circuit coupled to the sensor and configured to generate a difference output representing the sensed pressure minus a moving average;
a calculate circuit receiving the difference output, configured to calculate a trained output of historical data obtained during training, and to calculate a monitor output of current data obtained during monitoring; and
a diagnostic circuit configured to receive the trained output and the monitor output and generate a diagnostic output indicating a current condition of the impulse line. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A transmitter adapted to measure process flow, comprising,
a pressure sensor adapted to sense pressure of a process fluid; -
a difference circuit coupled to the sensor and configured to generate a difference output representing the sensed pressure minus a moving average;
a calculate circuit configured to receive the difference output and calculate a trained output of historical data obtained during training and to calculate a monitor output of current data obtained during monitoring; and
a diagnostic circuit configured to receive the trained output and the monitor output and to generate a diagnostic output indicative of a condition of a primary element and/or an impulse line of the transmitter. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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41. A diagnostic method for diagnosing a pressure transmitter coupled to a process fluid, the method comprising:
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calculating a difference between a pressure sensed by the pressure transmitter and a moving average of the sensed pressure;
acquiring and storing an historical data set of the calculated difference during a train mode of the pressure transmitter;
acquiring and storing a current data set of the calculated difference during a monitoring mode of the pressure transmitter; and
comparing the current data set to the historical data set to diagnose the condition of a primary element and/or an impulse line of the pressure transmitter. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. A computer-readable medium having stored thereon instructions executable by a microprocessor system to cause the microprocessor system to perform a diagnostic operation on a pressure transmitter coupled to a process fluid, the instructions comprising:
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calculating a difference between a pressure sensed by the pressure transmitter and a moving average of the sensed pressure;
acquiring and storing an historical data set of the calculated difference during a train mode of the pressure transmitter;
acquiring and storing a current data set of the calculated difference during a monitoring mode of the pressure transmitter; and
comparing the current data set to the historical data set to diagnose the condition of a primary element and/or an impulse line of the pressure transmitter.
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57. A pressure transmitter adapted to couple to a process fluid to sense process pressure, the pressure transmitter comprising:
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a pressure sensor for sensing process pressure;
differencing means for generating a difference output representing the sensed pressure minus a moving average;
calculating means for receiving the difference output for calculating a trained output of historical data obtained during training and for calculating a monitor output of current data obtained during monitoring; and
diagnosing means for receiving the trained output and the monitor output, generating a diagnostic output and diagnosing a current condition of a primary element and/or an impulse line of the pressure transmitter.
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58. A pressure transmitter for coupling to a process control loop and providing an output related to a pressure of process fluid, comprising:
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a pressure sensor adapted to measure a pressure of the process fluid and responsively provide a sensor output;
impulse piping configured to couple the pressure sensor to the process fluid;
computation circuitry adapted to calculate a statistical parameter of the pressure sensor output;
memory adapted to contain a baseline statistical parameter of the pressure sensor output;
diagnostic circuitry configured to compare the stored baseline statistical parameter of the pressure sensor output to a current statistical parameter and responsively provide a diagnostic output based upon the comparison, the diagnostic output indicative of a condition of a primary element and/or an impulse line of the pressure transmitter output circuitry to provide an output related to the sensed pressure. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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72. A method for detecting a degrading of impulse piping used to couple a pressure transmitter to a process fluid in a process control system, comprising:
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obtaining a pressure measurement signal related to pressure of a process fluid;
retrieving a baseline statistical parameter from a memory;
calculating a current statistical parameter of the pressure measurement signal;
comparing the baseline statistical parameter to the current statistical parameter; and
providing a diagnostic output based upon the step of comparing, the diagnostic output indicative of a condition of a primary element and/or an impulse line of the pressure transmitter. - View Dependent Claims (73, 74, 75, 76, 77, 78, 79, 80, 81, 82)
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Specification