FIELD: measurement of humidity of natural gases. SUBSTANCE: in accordance with method mirror-rule is divided into n elementary sections ( n>1 ) across which own temperature constant over entire section is set and maintained. Each section is provided with temperature-sensitive element and indicator of state of surface of this section that registers presence or absence of condensate on it. Temperatures of elementary sections can vary after certain time. Time law of control is determined either by operator or by programming unit. Error of measurement of temperature of dew point by given method is determined mainly by level of maintenance of constancy over elementary section and does not exceed value ±0,1°C which is 5-10 times less than errors generated by devices of same class. EFFECT: reduced measurement error. 4 dwg
