Measuring and testing – Volume or rate of flow – Thermal type
Patent
1986-04-09
1987-08-18
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
046868569
ABSTRACT:
A fluid mass flow meter that responds rapidly to changes in the rate of flow of a fluid and that is insensitive to variations in ambient temperature. The flow meter has a thermal clamp that clamps the sensor tube adjacent the extremities of a sensor disposed along the tube; a frequency compensating amplifier that, in cooperation with the thermal clamp, increases the frequency response of the meter; and an offset null bias circuit that, in combination with a bridge balancing potentiometer, corrects for the effects of variations in ambient temperature.
REFERENCES:
patent: 2594618 (1952-04-01), Booth, Jr.
patent: 2813237 (1957-11-01), Fluegel
patent: 2896452 (1959-07-01), Cogniat et al.
patent: 3085431 (1963-04-01), Yerman et al.
patent: 3363462 (1968-01-01), Sabin
patent: 4107991 (1978-08-01), Benson
patent: 4440021 (1984-04-01), Abouchar
CGS/Datametric Bulletin 600 "Heated Sensor Finds Wide Application in Fluid Flow", 1970, pp. 4, 5 and FIGS. 1-3.
Jung, "IC OP AMP Cookbook" published by H. W. Sams 1980, pp. 133, 134.
Flow Corporation Bulletin 53, pp. 9 and 10, dated 5/66.
Doyle Michael J.
Vavra Randall J.
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