Measuring and testing – Volume or rate of flow – Thermal type
Patent
1982-03-30
1984-03-20
Goldberg, Gerald
Measuring and testing
Volume or rate of flow
Thermal type
323280, G01F 168
Patent
active
044373457
ABSTRACT:
A gas flow measuring device has a measuring circuit for measuring the flow of gas based on the output signals of an electric heater and a first and a second temperature dependent resistor. In the measuring circuit, the first and the second temperature dependent resistors, together with first and second reference resistors, form a bridge and a constant voltage is applied to a voltage at one diametrical point of the bridge. The difference between the other voltage of the diametrical point of the bridge and the output of the constant voltage adding circuit is amplified, and the output voltage of the amplifier circuit is further amplified so that the voltage applied to the electric heater and the bridge is feed-back controlled.
REFERENCES:
patent: 4057206 (1977-11-01), Duncan et al.
patent: 4089214 (1978-05-01), Egami et al.
patent: 4275590 (1981-06-01), Kawai et al.
patent: 4276773 (1981-07-01), Kawai et al.
patent: 4304129 (1981-12-01), Kawai et al.
patent: 4373387 (1983-02-01), Nishimura et al.
Egami Tsuneyuki
Kawai Hisasi
Kohama Tokio
Obayashi Hideki
Goldberg Gerald
Nippon Soken Inc.
Tumm Brian R.
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