Vaisala PTU300 Guide de l'utilisateur Page 38

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User's Guide ______________________________________________________________________
36 __________________________________________________________________ M210796EN-A
Probe Mounting
In humidity measurement and especially in calibration it is essential
that temperature of the probe and measuring environment is the same.
Even a small difference in temperature between the environment and
the probe causes an error. As the curve below shows, if the
temperature is +20 °C and the relative humidity 100 %RH, a
difference of ±1 °C between the environment and the probe causes an
error of ±6 %RH.
The graph below illustrates the measurement error at 100 %RH when
the difference between the ambient and sensor temperature is 1 °C.
0507-023
Figure 19 Measurement Error at 100 %RH
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