Measuring and testing – Volume or rate of flow – Thermal type
Patent
1973-07-23
1976-02-17
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168, G01P 510
Patent
active
039383849
ABSTRACT:
A mass flow meter for measuring the flow rate of a fluid in a sensing tube over a wide ambient temperature range and with low sensitivity to attitude change. A pair of sensor temperature sensitive resistive wire coils are wound around the outer surface of the tube along the flow path of the fluid and are encased in open cell foam material. The sensor elements are heated and the rate of mass flow of the fluid is directly proportional to the temperature differential between the sensor elements. The sensor elements can be connected to a bridge circuit for detecting the temperature differential of the sensor elements. Tilting the sensor from the initial balance position results in a change in meter reading of less than 0.5%.
REFERENCES:
patent: 2813237 (1957-11-01), Fluegel et al.
patent: 3246523 (1966-04-01), Richard
patent: 3336804 (1967-08-01), Poppendiek et al.
patent: 3372590 (1968-03-01), Sterling
patent: 3433068 (1969-03-01), Werner et al.
patent: 3614967 (1971-10-01), Royston
patent: 3677085 (1972-07-01), Hayakawa
patent: 3802264 (1974-04-01), Poppendiek et al.
Bowes, "Variable Resistance Sensors Work Better With Constant Current Excitation," in Instrument Technology, 1966.
Goldstein Herbert
Tylan Corporation
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