Trace oxygen detector

Details Trace oxygen detector Trace oxygen detector

1980-01-23

1981-04-14

Serwin, R. E.

Chemistry: physical processes

Physical processes

Crystallization

422 83, 422 88, 422 98, G01N 2766, G01N 2131

Patent

active

042616980

ABSTRACT:
Apparatus and a method for measuring trace amounts of oxygen in an atmosphere is described. An oxygen free nitrogen gas is used as the carrier gas and nitrogen, ultra high purity, with approximately 10 ppm (parts per million) water is used as the reagent gas of an ionization source is operated at atmospheric pressure. A small electric field of approximately 200 volts per centimeter is applied across the length of the ionization chamber up to a pinhole entrance to a quadrupole mass spectrometer. The voltage is biased to repel negative ions towards the quadrupole mass spectrometer. Measurement of the peak height of the m/e value of 52 in the mass spectrum are integrated over a period of time. The results of the integration are then compared to a calibration chart which indicates the amount of oxygen that is present in the atmosphere being measured.

REFERENCES:
patent: 3647387 (1972-03-01), Benson et al.
patent: 3752652 (1973-08-01), Vleesschauwer
patent: 4147515 (1979-04-01), Hass et al.
patent: 4169708 (1979-10-01), Muggli
Carr, "Comparison of the Neg. React. Ions Formed in the Plasma Chroma. by N.sub.2, Air, and Sulfur Hexafluoride as the Drift Gas with Air as the Carrier Gas", Anal. Chem., vol. 51, No. 6, May 1979, pp. 705-711.

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