Apparatus for determining the flow rate of a flowing medium

Details Apparatus for determining the flow rate of a flowing medium Apparatus for determining the flow rate of a flowing medium

1987-10-13

1989-02-14

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

048038750

ABSTRACT:
An apparatus for determining the flow rate of a flowing medium having a substrate fastened at one end with a resistor arrangement disposed on the substrate which includes a layer-like measuring resistor (R.sub.S) and a layer-like heating resistor (R.sub.H). The heating output is regulated such that the measuring resistor (R.sub.S) has a constant electrical resistance, representing a flow rate of the flowing medium. By suitable provisions, such as a meandering pattern for the heating resistor (R.sub.H), the local resistance of the heating resistor (R.sub.H) crosswise to the flow direction is made to decrease toward the fastened end. Thus, the temperature generated by means of the heating resistor (R.sub.H) inside the substrate and the measuring resistor (R.sub.S) decreases toward the fastened end.

REFERENCES:
patent: 4399697 (1983-08-01), Kohama et al.
patent: 4449402 (1984-05-01), Eiermann et al.

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