Pressure transmitter with diagnostics
AssigneeRosemount Inc.
InventorsEvren Eryurek, Kadir Kavaklioglu
Life of this patent
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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.
Claims79
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 and provide a sensor signal;
- a first algorithm calculating a difference between the sensor signal and a moving average of the sensor signal;
- a second algorithm 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
- an output configured to provide an output related to pressure of the process fluid.
A pressure transmitter adapted to couple to a process via an impulse line to sense a pressure of process fluid, the pressure transmitter comprising:
- 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 a primary element.
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 of the transmitter.
A diagnostic method for diagnosing a pressure transmitter coupled to a process fluid, the method comprising:
- 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 of the pressure transmitter.
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:
- 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 of the pressure transmitter.
A pressure transmitter adapted to couple to a process fluid to sense process pressure, the pressure transmitter comprising:
- 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 of the pressure transmitter.
A pressure transmitter for coupling to a process control loop and providing an output related to a pressure of process fluid, comprising:
- 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 of the pressure transmitter;
- and
- output circuitry to provide an output related to the sensed pressure.
A method for detecting a degrading of a primary element impulse piping used to couple a pressure transmitter to a process fluid in a process control system, comprising:
- 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 of the pressure transmitter.
Dependencies are inferred from the claim text.