Primary standard gas flow calibrator

Details Primary standard gas flow calibrator Primary standard gas flow calibrator

1986-12-09

1989-08-29

Noland, Tom

Measuring and testing

Volume or rate of flow

By measuring transit time of tracer or tag

73 3, G01F 1708, G01F 2500

Patent

active

048605905

ABSTRACT:
An improved primary gas flow calibrator measures the flow rate of a gas source through a fixed volume by monitoring the travel time of a liquid soap film. The device comprises a novel mechanism for generating a single film of soap across a first end of a flow tube and an infrared light beam responsive timing system for determining the speed of a soap film moving through a portion of the flow tube. The device is a microprocessor-based system which comprises settable adjusting DIP switches for avoiding exacting dimensional tolerances of the flow tube during manufacture.

REFERENCES:
patent: 2333791 (1943-11-01), Hutchison, Jr.
patent: 2967450 (1961-01-01), Shields et al.
patent: 3248941 (1966-03-01), McArthur
patent: 3603146 (1971-09-01), Bennett et al.
patent: 3681985 (1972-08-01), Rudd
patent: 3748902 (1973-07-01), Guild
patent: 4691577 (1987-09-01), Lalin et al.
patent: 4762004 (1988-08-01), Lalin et al.
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