Gas flow measuring apparatus
US4357830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1980 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Sep 17, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/698
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas flow measuring apparatus of the type which measures for example, the amount of air flow to the engine of an automotive vehicle, includes a flow measuring tube, an electric heater wire and two temperature dependent resistance wires which are all positioned in the flow measuring tube such that one of the temperature dependent resistance wires is subjected to the effect of the heat of the electric heater and the other is not subjected to the same effect, whereby the flow rate of gas is measured in accordance with the output signal of a voltage divider including a series-connection of the temperature dependent resistance wires. The electric heater wire and the temperature dependent resistance wire subjected to the effect of the heat from the former are wound closely and alternately on the same support made from an electrical insulating material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.