METHOD OF MEASURING GAS HUMIDITY Russian patent published in 2011 - IPC G01N25/56 

FIELD: physics.

SUBSTANCE: method of measuring gas humidity involves conversion of the measured quantity to a parametre of an electrical signal transmitted over a measurement channel and periodic correction of the graduated characteristic of the hygrometre. Gas, whose humidity is being measured, is isobarically cooled to temperature lower than the dew point, determined from previous measurement results. The obtained gas with precisely known humidity is used to correct the graduated characteristic of the hygrometre. After cooling the gas to temperature lower than the dew point and before feeding the gas onto the hygrometre sensor, temperature of the gas is raised to an initial value. Also, after isobaric cooling of the gas in order to measure humidity, cooling the gas continues until a second value of humidity is obtained at a precisely known temperature of the gas and correction of the graduated characteristic of the hygrometre is carried out based on the obtained two measurement values of humidity.

EFFECT: automation of correction of the graduated characteristic of the hygrometre during measurement and providing long-term stability of measurement errors.

3 cl, 1 dwg