Process variable transmitter with two-wire process control loop diagnostics
US9182256B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 2010 |
| Grant date | Nov 10, 2015 |
| Priority date | — |
| Expiry date | Feb 14, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/24069
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two-wire process variable transmitter for use in an industrial process, including a process variable sensor configured to sense a process variable of a fluid of the industrial process. Output circuitry is configured to provide an output on a two-wire process control loop which is related to the sensed process variable. Loop current measurement circuitry measures a loop current flowing through the two-wire process control loop and terminal voltage measurement circuitry measures a voltage related to a terminal voltage of the process variable transmitter. The terminal voltage can be a voltage measured across an electrical connection of the two-wire process variable transmitter to the two-wire process control loop. Input circuitry is configured to receive a diagnostic command from the two-wire process control loop. A microprocessor configured to perform loop diagnostics on the two-wire process control loop based upon the measured loop current and terminal voltage in response to receipt of a diagnostic command from the two-wire process control loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.