Field transmitter built-in test equipment
US5481200A · kind A · utility
71Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1993 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | Sep 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2829
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved error detection for microprocessor-based transmitters in two-wire process control loops operating in the process control industry. In particular, techniques are shown which are useful in solving malfunctions or failures of microprocessor-based transmitters. When the transmitter is energized, the impedance of the process loop cabling is resolved and stored, displayed or transmitted as desired. The loop impedance is used to calculate potential of a power supply used to power the control loop. This information is used in testing the two-wire loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.