Measuring principle and using method of wet and dry bulb hygrometer

The indirect measurement method is adopted for the wet and dry bulb measurement. The humidity value is calculated by measuring the temperature of the dry bulb and the wet bulb.
Therefore, there is no strict limit to the use temperature, and the sensor will not be damaged by humidity measurement in high temperature environment. 
   As early as the 18th century, human beings invented the wet and dry bulb hygrometer. The accuracy of the wet and dry bulb hygrometer also depends on the accuracy of two thermometers, dry bulb and wet bulb.

    The hygrometer must be in ventilation state: only when the gauze water jacket, water quality and wind speed meet certain requirements      can the specified accuracy be achieved.

    The accuracy of the wet and dry bulb hygrometer is 5% - 7% RH