In-line real time air monitor

Details In-line real time air monitor In-line real time air monitor

1997-04-23

1998-07-14

Williams, Hezron E.

Measuring and testing

Gas analysis

With compensation detail

73 2341, 73 2335, 7386481, 73 2342, 422 83, 422 93, G01N 3014, G01N 932, G01N 2716, H01J 4904

Patent

active

057807175

ABSTRACT:
An in-line gas monitor capable of accurate gas composition analysis in a continuous real time manner even under strong applied vacuum conditions operates by mixing an air sample with helium forming a sample gas in two complementary sample loops embedded in a manifold which includes two pairs of 3-way solenoid valves. The sample gas is then analyzed in an ion trap mass spectrometer on a continuous basis. Two valve drivers actuate the two pairs of 3-way valves in a reciprocating fashion, so that there is always flow through the in-line gas monitor via one or the other of the sample loops. The duty cycle for the two pairs of 3-way valves is varied by tuning the two valve drivers to a duty cycle typically between 0.2 to 0.7 seconds.

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Marcus B. Wise, Cyril V. Thompson, Michelle V. Buchanan, Roosevelt Merriweather and Michael R. Guerin "Direct Sampling Ion Trap Mass Spectrometry," Spectroscopy 8(5) Jun. 1993, pp. 14-22.

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