Pressure sensor diagnostics in a process transmitter
US5665899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1996 |
| Grant date | Sep 9, 1997 |
| Priority date | — |
| Expiry date | Feb 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0075
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.