Trace water measurement

Details Trace water measurement Trace water measurement

1979-04-13

1980-12-16

Dixon, Harold A.

Radiant energy

Ionic separation or analysis

250282, 250288, B01D 5944

Patent

active

042399670

ABSTRACT:
A method for measuring trace amounts of water in an atmosphere. A dry inert gas is used as the carrier gas and a dry gas comprising about 20 percent oxygen and about 80 percent inert gas is used as the reagent gas. The ionization source is operated at atmospheric pressure. A small electric field of about 200 volts per centimeter is applied across the ion drift chamber and it is biased to repel negative ions to a quadrupole mass filter. Measurements at an m/e value of 52 are integrated over a period of time. The results of the integration, when compared to a calibration chart, indicate the amount of water that had been present in the atmosphere being measured.

REFERENCES:
patent: 3639757 (1972-02-01), Carroll et al.
patent: 3668382 (1971-06-01), Cohen et al.
patent: 4023398 (1977-05-01), French
patent: 4144451 (1979-03-01), Kambara

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