Gas flow measuring device

Details Gas flow measuring device Gas flow measuring device

1981-03-12

1983-05-24

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

73118, G01F 168

Patent

active

043844847

ABSTRACT:
A first temperature dependent resistor and a second temperature dependent resistor are disposed within a pipe for flowing a gas whose flow rate is to be measured. An electric heater is located between these temperature dependent resistors and is heated for the purpose of measurement of the flow rate of the gas. A first reference resistor and a second reference resistor constitute a bridge circuit together with the first and second temperature dependent resistors. A measuring circuit controls the current or voltage applied to the electric heater in accordance with the voltage between the terminals of the bridge circuit, so as to generate an output signal representing the flow rate of the gas. The temperature coefficient resistance of the electric heater is smaller than that of the temperature dependent resistors.

REFERENCES:
patent: 1902427 (1933-03-01), Sawyer
patent: 2729976 (1956-01-01), Laub
patent: 3975951 (1976-08-01), Kohama et al.
patent: 4244217 (1981-01-01), Ledbetter

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