9
(2) On measuring range for continuous measurement and measuring area
Part
and
are areas where measurement is
possible.
Part
is an area where continuous measurement is
possible.
Part
is an area where a short time measurement is
possible.
Principles of Operation
When the sensor section of thermometer is wrapped with a gauze which is dampened
with water, the temperature of the sensing sensor will fall. The latent heat of evaporation
of water at this time has a definite relation with vapor pressure and therefore relative
humidity etc. can be calculated by formula.
The instruments uses platinum resistance temperature detector which has stable
accuracy for a long period of time for the temperature measurement of dry bulb and wet
bulb and uses the latest CPU in its operation section to operate with high precision.
%RH
100
90
80
70
60
50
40
30
20
10
0
10
20
30
40
50
℃
R/V
converter
A/D
converter
dry bulb
temperature
wet bulb
temperature
CPU
relative humidity
D/A converter
dew point
absolute humidity
0
～
1V
DC
0
～
1V
DC
