Measuring and testing – Volume or rate of flow – Thermal type
Patent
1985-01-10
1987-07-28
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
046824960
ABSTRACT:
A semiconductor type flow rate detecting apparatus having first and second control units arranged at upstream and downstream positions respectively in a flow stream to be measured and an operation circuit. The first control unit includes a first temperature detecting element and a first temperature control heater. The second control unit includes a second temperature detecting element, a second temperature control heater and a preliminary heater. The operation circuit controls the second and preliminary heaters and generates a signal indicative of flow rate. The operation circuit has a constant power consumption circuit to control heat from the preliminary heater to a constant level.
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Hattori Tadashi
Iwasaki Yukio
Kanehara Kenji
Kohama Tokio
Miura Kazuhiko
Goldstein Herbert
Nippon Soken Inc.
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