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REVISTA DE CHIMIE
Cite as: Rev. Chim.
https://doi.org/10.37358/Rev.Chim.1949

OSIM Nr. R102355
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Revista de Chimie (Rev. Chim.), Year 2006, Volume 57, Issue 10,





Humidity Calibration System Used for Calibration of the Hygrometers
which Measure the Dew Point Between (-50.0…20.0)0C


Abstract:

The paper describes the principle of generation, procedure of handling, as well as stability and uniformity of the temperature and humidity, in the test chamber. The theory of the two-pressure humidity atmosphere producer is reviewed. A humidity generator was designed and constructed in order to establish humidity standard and to calibrate humidity sensors. Normal operating limits are within the range (-50,0...+20,0) 0C with an uncertainty of 0,44 0C. The system was assured by dew point hygrometer. For characterizing the quality of a measured result, the uncertainty must be expressed and evaluated. This paper also describes the modelling of the measurements of the relative humidity Y. The relative humidity is not directly measured, being estimated from N other quantities (X1, X2... XN) through a functional relationship. The temperature of the gas, pressure and flow represent the input quantities whose values and uncertainties are directly determined in the current measurement. Keywords: humidity of gases, reference standards, measurement uncertainty, evaluation method

Issue: 2006, Volume 57, Issue 10
Pages:
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