Flow sensor

Details Flow sensor Flow sensor

1993-07-21

1994-12-06

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

053699947

ABSTRACT:
The invention is directed to a flow sensor having a heater, two temperature measuring sensors, a heater temperature sensor and a medium temperature sensor. A control circuit is provided which controls the overtemperature of the heater in dependence upon the temperature of the flowing medium. With this arrangement, the influence of the temperature dependency of the following on the sensor characteristic are compensated: viscosity, thermal conductance and thermal capacity of the medium. The relationship between the heater temperature and the temperature of the medium is adjusted in a slightly nonlinear manner by means of special evaluation circuits. In this way, a further improvement of the temperature compensation is obtained.

REFERENCES:
patent: 4135396 (1979-01-01), Stanke
patent: 4344322 (1982-08-01), Plapp
patent: 4501144 (1985-02-01), Higashi et al.
patent: 4739657 (1988-04-01), Higashi et al.
patent: 4777820 (1988-10-01), Hecht et al.
patent: 4884443 (1989-12-01), Lee et al.
patent: 5072614 (1991-12-01), Hisanaga

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