Trace water measurement

Details Trace water measurement Trace water measurement

G - Physics

01

N

358/21

G01N 27/00 (2006.01) G01N 27/64 (2006.01)

Patent

CA 1126879

ABSTRACT OF THE DISCLOSURE 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. PO9-79-016

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