Multi-measurement vortex flowmeter
US9696742B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 2013 |
| Grant date | Jul 4, 2017 |
| Priority date | — |
| Expiry date | May 7, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N9/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Two-wire transmitters are described in which the required voltage that a control room must supply to the transmitter is lower at high current than at low current, thus freeing up more voltage for other uses, and in which a constant set of operating voltages may be maintained. A corrected pressure in a vortex flow meter may be determined that reflects the mass flow rate. Thus, the mass flow rate may be determined based on the corrected pressure reading and a measured volumetric flow rate. Density may be determined from pressure and temperature using a table containing error values based on a standard density determination and a relatively simple approximation. During operation of a flow meter, the stored error values may be linearly interpolated and the approximation may be computed to determine the density from the stored error value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.