Abstract
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 degrees C up to +70 degrees C with an uncertainty range from +/- 0.52 degrees C to +/- 1.7 degrees C and covered the calibration requests from Egyptian industries.
We are looking forward to increase this range and decrease measurement the uncertainty value.