Method for analyzing gases according to the counter flow princip

Details Method for analyzing gases according to the counter flow princip Method for analyzing gases according to the counter flow princip

1989-08-28

1991-01-08

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250289, 73 407, H01J 4926

Patent

active

049838296

ABSTRACT:
The invention resides in a method for analyzing gases according to the counterflow principle, comprising a mass spectrometer tube (3) located at the suction side of a molecular pump (2). The primary vacuum pressure is adjusted in such a way that basically ambiguous spectrometer indications can only result from a gas with low molecular weight reaching the mass spectrometer in counterflow to the molecular pump and not from a gas with higher molecular weight, which in itself would provoke a similar spectrometer indication.

REFERENCES:
patent: 4195224 (1980-03-01), Sanger et al.
patent: 4487058 (1984-12-01), Mennenga
patent: 4550593 (1985-11-01), Reich
patent: 4773256 (1988-09-01), Saulgeot

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