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1 2009

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Realization of Humidity Standard Facility Using Two- Pressure Humidity Generator and Humidity Chamber

El-Din E., Mekawy M. M., Ali K. M.

Metrology and Measurement Systems

2009

Vol. 16, nr 2

323-327

The realization of a dew/frost-point temperature scale is important for the calibration of hygrometers and dew/frost-point meters. Also, it was found that it is prime important for the National Institute for Standards-Egypt (NIS) to develop measurements of humidity field. Experimental work used for realization of the dew/frost-point temperature scale, to calculate humidity measurements with high accuracy and to calculate the measurement uncertainty value of the dew-frost point. The dew-point temperature scale was realized using a two-pressure generator, humidity chamber, chilled mirror hygrometer and testo hygrometer. This work shows that the dew/frost-point temperature scale cover the range from -20 °C up to +70 °C with an uncertainty range from ± 0.52 °C to ± 1.7 °C and covered the calibration requests from Egyptian industries. We are looking forward to increase this range and decrease measurement the uncertainty value.