Direct-heated flow measuring apparatus having film resistor
US4688425A · kind A · utility
6Cited by
1References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F25/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a direct-heated flow measuring apparatus including an electric heater of a film resistor type and a temperature-detecting resistor for detecting the temperature within a passage, the flow rate thereof is measured by a sensing circuit. The temperatures of the electric heater and the temperature of the temperature-detecting resistor are compared. The measuring operation of the sensing circuit is stopped when the temperature within the passage is abnormal as indicated by this comparison.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.