Pressure to voltage converter for measuring gas glow rates

Measuring and testing – Volume or rate of flow – Using differential pressure

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73 3, 73198, 7386102, 12820523, G01F 150

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active

045819459

ABSTRACT:
A converter has a pressure to voltage transducer connected to an amplifier. A laminar gas flow element (L.F.E.) may be connected to the transducer and the converter output voltage is a measure of the gas flow rate through the L.F.E. The converter gain may be switched from one value when one kind of anesthetic gas is being monitored to another gain values when a second gas is used. The ratio of the one gain values to the second is made equal to the ratio of viscosities of the second gas to that of the first so that recalibration is not necessary when the kind of gas in use is changed. Further, the absolute values of the stepped gains with fixed ratio are adjusted vernierly to produce a predetermined output voltage for each L.F.E. with a known rate of gas flowing, which absolute gain value in each case may be recorded as a characterization of each particular L.F.E. After such characterizations are made, no further calibrations of L.F.E. or converters are needed and any L.F.E. combined with any converter, with the converter gain reset of the "characterizing gain" associated with the particular L.F.E., provides a calibrated anesthetic gas flow measuring instrument.

REFERENCES:
patent: 1778716 (1930-10-01), Foregger
patent: 2099842 (1937-11-01), Connell
patent: 3071160 (1963-01-01), Weichbrod
patent: 3713337 (1973-01-01), Stroman

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