Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1997-03-12
1998-09-29
Larkin, Daniel S.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73 2905, 324664, 324689, G01N 3318, G01R 2722
Patent
active
058147268
ABSTRACT:
A method for determining the absolute humidity of air by aid of a capacitive sensor and a temperature sensor as well as a heating element. The sensor temperature is changed upon reaching a predetermined humidity limit value. In order to eliminate the risk of falsified measuring values and to enable long-time stable and accurate measuring also in the high-humidity range, the determination of the humidity of air until reaching the predetermined humidity limit value is effected by evaluating the value measured for the capacity of the sensor. Upon reaching a predetermined limit value, the temperature of the sensor is controlled to a constant sensor capacity by heating and is evaluated.
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Sonntag, D., "Important New Values of the Physical Constants of 1986, Vapour Pressure Formulations based on the ITS-90, and Psychrometer Formulae," Z. Meteorol., vol. 70, No. 5, pp. 340-344 (1990).
Hyland, R.W., "A Correlation For The Second Interaction Virial Coefficients and Enhancement Factors for Moist Air" Journal of Research of National Bureau of Standards--A Physics and Chemistry, vol. 79A, No. 4, pp. 551-560, Jul.-Aug. 1975.
E & E Elektronik Gesellschaft M.B.H.
Larkin Daniel S.
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