Thermosetting flowmeter

Measuring and testing – Volume or rate of flow – Thermal type

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Details

7320415, 7320419, G01M 1500

Patent

active

054600405

ABSTRACT:
An object of the present invention is to obtain a highly accurate thermosensitive flowmeter in which flow rate characteristic errors and temperature characteristic errors of a flow rate signal voltage are small. According to the present invention, flow rate characteristic errors and temperature characteristic errors of a thermosensitive resistor caused by trimming adjustment made on the thermosensitive resistor can be reduced by providing unvaried profile of heating area on the thermosensitive resistor. Bridge balance is adjusted so that the heat value of the thermosensitive resistor correspond with predetermined value, and gain of amplifier is adjusted so that the flow rate signal voltage correspond with predetermined value.

REFERENCES:
patent: 3363462 (1968-01-01), Sabin
patent: 4450719 (1984-05-01), Nishimura et al.
patent: 4523462 (1985-06-01), Kolodjski
patent: 4686856 (1987-08-01), Vavra et al.
patent: 4907446 (1990-01-01), Inada et al.

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