Adjustable temperature variable output signal circuit

Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock

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3072966, 307359, 307261, H01L 2716

Patent

active

049470574

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. An improved adjustable circuit (36-41) is provided for producing a desired temperature variable output signal (V.sub.os).

REFERENCES:
patent: 4096382 (1978-06-01), Numata et al.
patent: 4260946 (1981-04-01), Wheatley, Jr.
patent: 4478527 (1984-10-01), Mergner
patent: 4495472 (1985-01-01), Dwarakanath
patent: 4677369 (1987-06-01), Bowers et al.
patent: 4730128 (1988-03-01), Seki
patent: 4798093 (1989-01-01), Kenoun

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