Flueric partial pressure sensors

Details Flueric partial pressure sensors Flueric partial pressure sensors

1981-03-13

1983-10-04

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

12820424, 137804, G01N 700

Patent

active

044071531

ABSTRACT:
A flueric partial pressure sensor includes a flueric bridge having two bridge legs adapted for sensing a reference-gas and sample-gas mixture. A linear resistor and an orifice resistor are incorporated in each of the bridge legs which are conjoined to discharge from a single outlet. The resistors are arranged to provide an asymmetric balance of the flow rates through the bridge legs. The asymmetric balance is selected so that in operation a constant pressure output signal is generated for a chosen partial pressure of a constituent gas of the sample-gas mixture in varying absolute pressure conditions such as changes in altitude. Respective pressure signal outlets connected one with each bridge leg at a position between the linear resistor and the orifice resistor are used to effect control of a flueric laminar flow proportional amplifier. Outputs from the flueric amplifier may be used to regulate a fluid mixing valve shown in FIG. 3, or to effect switching of an indicator device shown in FIG. 4.

REFERENCES:
patent: 3490408 (1970-01-01), Monge et al.
patent: 3665947 (1972-05-01), Mayer
patent: 3771348 (1973-11-01), Villarroel
patent: 3817085 (1974-06-01), Stubbs
patent: 4008601 (1977-02-01), Woods
patent: 4100789 (1978-07-01), Joyce

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