Process and device for supplying gas to an analyzer of traces of

Details Process and device for supplying gas to an analyzer of traces of Process and device for supplying gas to an analyzer of traces of

1995-01-09

1996-12-24

Noland, Thomas P.

Measuring and testing

Instrument proving or calibrating

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

73 3103, G01N 3300

Patent

active

055875190

ABSTRACT:
A novel process for supplying a gas to an analyzer for measuring traces of impurities in the gas is provided. The process includes the steps of supplying the analyzer with: (i) a gas to be analyzed; (ii) a pure gas; and (iii) a standardizing gas obtained by dilution of one or more impurities in the pure gas as follows: (A) dividing a flow of pure gas into a set of at least first and second bypass lines, arranged in parallel, each of the bypass lines having an entry including a calibrated restriction, the flow of pure gas into the set of bypass lines being regulated by a flow regulator placed upstream of the set, (B) charging the pure gas of the first bypass line with a predetermined quantity of at least one impurity to obtain, after dilution with the pure gas of the second bypass line, a flow of the standardizing gas, which is directed from an exit of the set of bypass lines towards the analyzer along a feed line.

REFERENCES:
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patent: 5259233 (1993-11-01), Brandt
patent: 5261452 (1993-11-01), McAndrew et al.
patent: 5305630 (1994-04-01), Molozay et al.
Patent Abstracts of Japan ABS Grp C081 vol. 5, No. 188 Abs Pub. date Nov. 27, 1981 (56-111033) "Gas Mixer".

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