Working of hair hygrometer.

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 Hair hygrometer








In the hair hygrometer, horse hair is used to sense the relative humidity because of horse hair is sensitive to humidity.

so as the humidity increase or decrease also the length of the horse hair is increase or decrease.

by using this property of  horse hair we can measure the humidity.


Construction and working


As we can see in above figure, there is a number of horse hair connected as shown in the figure.

One end of the  Pointer is connected to pivot and other end of the  pointer  is move on the calibrated scale. this scale is calibrated in terms of relative humidity.

now as humidity is increase or decrease the length of the hair hygrometer is also increase and decrease.

So the pointer is move accordingly on the calibrated scale due to mechanical connection as show in figure.

This pointer indicate the relative humidity.

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