INSTALLATION:- The instrument is composed of two thermometers. Hang it vertically in a place
where there is steady flow of air.
OPERATION:- Fill the cistern with distilled water. Change the water frequently. The wick is
changed regularly to ensure a constant flow of moisture to wet bulb.
TAKING READING & USE OF TABLE:-
- Not down temp. of dry bulb & wet bulb thermometer.
- Calculate the difference of temperature between them. It is termed as depression value of we
- In the table locate reading of the dry bulb against depression value calculated at step No. 2 &
at the intersection of the 2 columns read the % age relative humidity. For example if temp. of
dry bulb thermometer is 300 C & temp. of wet bulb thermometer is 250 C. Depression value
of wet bulb is 300 C -250 C = 50 C. Now at the intersection of dry bulb temp. 300 C &
depression value of wet bulb % age relative humidity is located. It is 65%.
REF. DOCUMENT HYGROMETER TABLE