Gas flow measuring device

Details Gas flow measuring device Gas flow measuring device

1981-04-07

1983-10-18

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

73118, G01F 168

Patent

active

044098286

ABSTRACT:
An electric heater connected between first and second temperature dependent resistors provided inside a pipe through which the gas the flow of which is to be measured is heated for the measurement of the gas flow. A voltage control circuit controls the voltage applied to or current through the electric heater such as to maintain a constant potential difference between diagonal points of a bridge circuit which is formed by the first and second temperature dependent resistors and first and second reference resistors. An output computing circuit which receives a signal proportional to the voltage across the electric heater and also to the current therethrough produces an output signal representing the rate of flow of gas being measured.

REFERENCES:
patent: 3800592 (1974-04-01), Jones, Jr.
patent: 3975951 (1976-08-01), Kohama et al.

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