Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1978-01-10
1979-10-30
Swisher, S. Clement
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G12B 1300
Patent
active
041723783
ABSTRACT:
A calibrated gas source for testing leakage indicators composed of a housing divided into two chambers by a partition having a gas passage between the chambers, a mass of liquefied gas filling one of the chambers, a valve associated with the passage for permitting gas to pass from the one chamber to the other chamber when it is under a certain excess pressure, and a capillary passage between the other chamber and the surrounding environment.
REFERENCES:
patent: 3209579 (1965-10-01), Roberts
patent: 3516278 (1970-06-01), Klein et al.
Leybold-Heraeus GmbH & Co. KG
Roskos Joseph W.
Swisher S. Clement
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