Gas metering apparatus for use with small volume, small flow gas

Details Gas metering apparatus for use with small volume, small flow gas Gas metering apparatus for use with small volume, small flow gas

1987-12-21

1989-04-25

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Expansible chamber

73239, G01F 1102

Patent

active

048235989

ABSTRACT:
A precision gas metering apparatus is disclosed and comprises facing duplicate cylinders each having a piston therein, wherein the two cylinders are aligned with one another so that a common non-rotating shaft moves pistons in each. The shaft is driven by a stepping motor having a traveling nut connected to said shaft to impart rotation from the motor which is converted into linear movement of the shaft. With suitable valves and a pressure transducer, gas to be measured is delivered first to one volume and then to the other, the pistons being driven to equalize in flowing gas pressure to atmospheric pressure level, and thereafter summing the total volumetric filling by summing each filling of each chamber, and also summing any partial fillings. A pressure transducer assures that the filled chambers are held to a specified volume.

REFERENCES:
patent: 2892346 (1959-06-01), Sargent
patent: 3463004 (1969-08-01), Withnell
patent: 3657925 (1972-04-01), Gross

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