8/19/2019 Understanding Relative Humidity and the Hygrometer
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+he "hair hygrometer" offers high sensitivity to humidity #y
relying on the minute
expansions and contractions of a hair. +he "spiral hygrometer"
has an internal, spiral
metal strip which reacts to humidity.
Cali rating your hygrometer!ali#rating your hygrometer depends
on your model. &n some, a small screwdriver is
used on the #ac panel5s set screw to change the indicator
reading.
&n other models, the entire hygrometer movement is rotated
until the dial reads
appropriately. 6anufacturer5s instructions for other
configurations would apply.
Testing hygrometer accuracy!7ou can test an hygrometer5s
accuracy in two common ways8
1. rap a damp cloth on the #ac of the hygrometer for 9 hours.
+he indicator should thenread approx. : %. &f it reads lower or
is off scale completely, merely ad;ust the indicatorto read : %
using one of the methods descri#ed a#ove.
). 3nother way to chec cali#ration uses ta#le salt, a
see2through container such as a
