Differential pressure type flowmeter and differential pressure type flow controller
US7367241B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 18, 2004 |
| Grant date | May 6, 2008 |
| Priority date | — |
| Expiry date | Jul 6, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D7/0635
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A differential pressure type flowmeter comprises an orifice, a detector to detect a fluid pressure P1 on the upstream side of an orifice, a detector to detect a fluid pressure P2 on the downstream side of an orifice, a detector to detect a fluid temperature T on the upstream side of an orifice, and a control computation circuit to compute a fluid's flow rate Q passing through an orifice by using the pressure P1, where P2 and temperature T detected with the aforementioned detectors, and the aforementioned fluid's flow rate Q is computed with the equationQ=C1•P1/√T•((P2/P1)m−(P2/P1)m)1/2 (where C1 is a proportional constant, and m and n are constants).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.