Flow volume calibrator

Details Flow volume calibrator Flow volume calibrator

1990-08-29

1991-12-31

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01F 2500

Patent

active

050760939

ABSTRACT:
An apparatus for calibrating a spirometer controls the temperature and moisture content of the gas which it receives and accurately measures the flow rates of gas it receives and discharges. This apparatus includes a housing with an opening through which it receives and discharges the gas. This housing contains a piston which engages the inner surface of the housing to form a gas receiving chamber within the housing. The piston lies in sliding engagement in the housing and a user may move it to increase or decrease the volume of the chamber and pull gas into the chamber through the opening or force gas out of the chamber. A heating element disposed proximate the chamber heats the gas which the chamber receives; and a gas moisturizing element disposed in the housing adds moisture to the gas moving into the chamber and out of the chamber through the housing opening. The apparatus also includes a displacement detecting assembly for measuring the displacement of the piston to measure the flow of gas out of the chamber and into it.

REFERENCES:
patent: 3512521 (1970-05-01), Jones
patent: 3977394 (1976-08-01), Jones et al.
patent: 4203316 (1980-05-01), Jones
patent: 4224281 (1980-09-01), Thieme et al.
patent: 4250890 (1981-02-01), Jones et al.
patent: 4324127 (1982-04-01), Gazzara et al.
patent: 4421120 (1983-12-01), Edwards, Jr. et al.
patent: 4475666 (1984-10-01), Bilbrey et al.
patent: 4908017 (1990-03-01), Howson et al.

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