Method and apparatus for determining the relative humidity of ga

Details Method and apparatus for determining the relative humidity of ga Method and apparatus for determining the relative humidity of ga

1991-02-25

1992-09-22

Williams, Hezron E.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

374 20, G01N 2568

Patent

active

051487101

ABSTRACT:
A method for determining the relative humidity of gaseous materials, preferably for determining the relative humidity of air in rooms, such as greenhouses, whereby, using psychrometric moisture measurement, the temperature of the stream of gas, the relative humidity of which is to be measured, is determined by means of temperature sensors. A gas stream acting upon a moistenable wet temperature sensor is cooled up to a cooling limit (wet-bulb point) and the wet bulb point temperature is determined. The relative humidity is ascertained using the measured temperature of the gas and the wet-bulb temperature. In order to be able to carry out a reliable determination of the relative humidity over longer periods of time even in a high humidity range, the stream of gas, the humidity of which is to be measured, is initially cooled to at least its dew point temperature in order to moisten the wet temperature sensor directly, the dew point temperature is determined and the wet temperature sensor is moistened to a determinable extent with condensate condensing from the gas stream. After this, for determining the wet-bulb point temperature, the stream of gas is cooled adiabatically with evaporation of the condensate condensed on the wet temperature sensor.

REFERENCES:
patent: 3712140 (1973-01-01), Grasso et al.
patent: 4227411 (1980-10-01), Abramovich
patent: 4279150 (1981-07-01), Land
patent: 4629333 (1986-12-01), Dosoretz et al.

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