Thermal type flow meter
US5952571A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Sep 22, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Sep 22, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/69
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a thermal type flow meter having a temperature compensating bridge circuit, the temperature compensating bridge circuit includes a heating resistor, a temperature compensating resistor and a plurality of resistors each having a fixed resistance. The heating resistor and the temperature compensating resistor are supported by a support member in an air flow passage, and the support member is formed by a material having a small temperature coefficient .DELTA..lambda. of thermal conductivity between -0.06 and 0.06 w/m.multidot.k.sup.2. The absolute value of the output error of the flow meter is reduced as a result of variation of the flow quantity or flow velocity of intake air and the intake air temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.