Measuring and testing – Volume or rate of flow – Thermal type
Patent
1994-06-06
1995-10-24
Chilcot, Richard
Measuring and testing
Volume or rate of flow
Thermal type
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.
Tada Yasuo
Yasui Katsuaki
Artis Jewel V.
Chilcot Richard
Mitsubishi Denki & Kabushiki Kaisha
Turner Richard C.
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