Process and apparatus for supplying gas to a very highly sensiti

Details Process and apparatus for supplying gas to a very highly sensiti Process and apparatus for supplying gas to a very highly sensiti

1991-09-17

1994-04-26

Noland, Tom

Measuring and testing

Instrument proving or calibrating

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

73 3103, G01D 1800

Patent

active

053056302

ABSTRACT:
The line of gas to be analyzed, the "zero" gas line and calibration gas line are each provided with a restriction operating in sonic rate supplying a nominal constant flow and downstream, have a discharge duct provided with a flow regulator. The nominal flows in the first and second lines are higher than the given flow supplied to the analyzer so that during each of the calibration and analysis steps, the whole of the circuit portion of the device is permanently flushed with the nominal gas of the line and/or by a portion of the recirculated flow of gas originating from another line.

REFERENCES:
patent: 3776023 (1973-12-01), Budd et al.
patent: 4063446 (1977-12-01), Fuhrmann
patent: 4436699 (1984-03-01), Narato et al.
patent: 4588422 (1980-05-01), Raimond
patent: 4656865 (1987-04-01), Callan
patent: 5157957 (1992-10-01), Metles et al.
patent: 5214952 (1993-06-01), Leggett et al.

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