Apparatus for measuring the mass of a flowing medium and method

Details Apparatus for measuring the mass of a flowing medium and method Apparatus for measuring the mass of a flowing medium and method

1989-02-08

1990-01-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

731182, G01F 168

Patent

active

048919780

ABSTRACT:
An apparatus for measuring the mass of a flowing medium and a method for producing the apparatus. The apparatus includes a carrier, to which at least one resistor layer is applied. To calibrate the resistance value of the resistor layer, material can be removed in a calibration zone on the end of the resistor layer remote from the incident direction of flow. To this end, the resistor layer is connected with a current source furnishing a constant current. The temperature of the resistor layer is measured by means of a temperature measuring device and compared in an electronic device with a predetermined temperature, and the electronic device, upon a deviation of the measured temperature from the predetermined temperature triggers a material removing device for the removal of resistor material in the calibration zone (trimming zone).

REFERENCES:
patent: 4213335 (1980-07-01), Peter et al.
patent: 4399697 (1983-08-01), Kohama et al.

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