Digital differential pressure transducer
US4382385A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1980 |
| Grant date | May 10, 1983 |
| Priority date | — |
| Expiry date | Apr 17, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0022
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital differential pressure transducer with relatively low sensitivity to common mode line pressure errors. The transducer includes an airtight enclosure having a pair of pressure ports through which pressure is coupled to opposite sides of a pressure-sensing diaphragm or bellows. The force generated by the pressure differential across the diaphragm or bellows is coupled to a stress-sensitive resonator either directly or through a force-transmitting structure. A first bellows extends from the diaphragm or a bellows end cap. The first bellows has an effective area which is substantially smaller than the effective area of the pressure-sensing diaphragm or bellows so that it applies substantially less pressure-induced stress to the resonator than does the pressure-sensing diaphragm or bellows. A second bellows has an effective area and a mounting position chosen to counteract the effect of the first bellows on the pressure-sensing diaphragm or bellows. The common mode line pressure error of the transducer resulting from a mismatch between the forces generated by the first and second bellows is thus proportional to the ratio of the effective area of the first bellows to the effecti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.