Measuring and testing – Volume or rate of flow – Thermal type
Patent
1981-03-11
1983-07-19
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
73118, G01F 168
Patent
active
043937020
ABSTRACT:
A first temperature dependent resistor, an electric heater and a second temperature dependent resistor are arranged in this order within and from the downstream to the upstream of a pipe in which flows a gas whose flow rate is to be measured. A bridge circuit is formed by the first and second temperature dependent resistors along with first and second reference resistors. In response to the output of the bridge circuit, a measuring circuit regulates the supply of power to the electric heater and generates a signal indicative of the flow rate of the gas. Each of the first and second reference resistors is in the form of a film resistor formed on an insulating base. The insulating base having the film resistors formed thereon is placed for example in the flow of the gas to be measured. Each of the first and second temperature dependent resistors and the electric heater includes a resistance wire of a platinum alloy containing platinum and a predetermined proportion of another metal such as nickel, rhodium, iridium, palladium or ruthenium.
REFERENCES:
patent: 4024761 (1977-05-01), Djorup
patent: 4089214 (1978-05-01), Egami et al.
patent: 4283944 (1981-08-01), Gruner
Malin et al., "Mass Flow Meter", IBM Technical Disclosure Bulletin, vol. 21 #8 1/79, p. 3227.
Egami Tsuneyuki
Kawai Hisasi
Kohama Tokio
Obayashi Hideki
Goldstein Herbert
Nippon Soken Inc.
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