Measuring and testing – Volume or rate of flow – Thermal type
Patent
1987-09-09
1989-08-08
Levy, Stewart J.
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
048541672
ABSTRACT:
A mass fluid flow sensor is disclosed which utilizes a sensing bridge circuit to develop a sense (control) signal related to fluid flow. A fluid temperature variable resistor, separate from said bridge circuit, is utilized to implement temperature compensation so that a desired output signal is a function of sensed fluid flow, but is less dependent on fluid temperature than the sense (control) signal provided by the bridge circuit. A resistor in the bridge circuit is selected such that the sense (control) signal provided by the bridge circuit has a rate of change as a function of flow rate substantially independent of fluid temperature, but this sense signal still varies as a function of fluid temperature. This permits fluid temperature compensation of the bridge sense signal in a noncomplex and cost effective manner.
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Alexander Steven W.
Czarnocki Walter S.
Harper Peter W.
Moran Kevin S.
Bell Robert P.
Levy Stewart J.
Melamed Phillip H.
Motorola Inc.
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