Moisture measurement method in sample gas

Abstract

Abstract PURPOSE:To enable exact measurement irrespectively of the change in the sensitivity of a moisture concn. detector by supplying standard gas in sample gas in the preceding stage of the detector in such a way that the output signal of the detector is kept always constant and determining the moisture in the sample gas from the amt. of the standard gas to be supplied. CONSTITUTION:A solenoid valve 7 is closed and a solenoid valve 16 is opened to introduce the dry air which is quantatively humidified by a control pump 14 for supplying humidifying moisture as standard gas having a moisture concn. A into a detector 9 in the case of performing automatic one-point calibration at one point slightly higher than the fluctuating width of the moisture in the sample gas. The output of the detector in this stage is defined as E1. The valve 7 is opened and the valve 16 is closed to introduce sample gas into the detector 9. The pump 14 is controlled with a controller 13 according to the output signal from the detector 9 to supply the standard gas to the sample gas so that the output of the detector attains E1. The moisture concn. corresponding to the moisture in the supplied standard gas is subtracted from the known concn. A, whereby the moisture concn. in the sample gas is determined.

Inventors

• 👤 Atsushi Tanaka
• 👤 厚 田中
• 👤 Toshiyuki Shimizu
• 👤 俊之 清水

Bibliographic Details