Thermal type flow sensor having a second control circuit to control a second heating resistor above the first heating temperature
US7565836B2 · kind B2 · utility
11Cited by
8References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 12, 2007 |
| Grant date | Jul 28, 2009 |
| Priority date | — |
| Expiry date | Apr 12, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/699
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flow rate measuring element of a thermal type flow sensor is placed in the fluid to be measured. The element includes: a first heating resistor for measuring a flow rate; a second heating resistor for heating a support for the first heating resistor; and current control circuits and which control heating resistor supply current so that the temperature of the second heating resistor is higher than the temperature of the first heating resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.