Pressure sensor diagnostics in a process transmitter
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United States of America Patent
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Sep 9, 1997
Grant Date -
N/A
app pub date -
Feb 23, 1996
filing date -
Feb 23, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A transmitter in a process control system includes diagnostic circuitry for determining condition of a pressure sensor. The pressure sensor includes a pressure responsive structure and a capacitor coupled to the pressure responsive structure whereby capacitance of the capacitor varies in response to process pressure. Measurement circuitry determines capacitance which is transmitted over a process control loop using output circuitry. The diagnostic circuitry is coupled to the pressure sensor and provides a diagnostic input to the pressure sensor. The diagnostic input causes a change in the capacitance which is monitored to determine condition of the pressure sensor.
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