Vaisala HMT100 - Manual (Page 28)

User's Guide ______________________________________________________________________
28 __________________________________________________________________ M210701EN-D
Calibration and Adjustment
Calibrate and adjust the HMT100 using the push-buttons on the
motherboard or with portable humidity meters HM70 or HMI41.
A calibrator kit is needed for calibration against saturated salt solutions.
The HMK15 Humidity Calibrator and pre-measured certified salts are
available from Vaisala. For further information, please contact your
Vaisala representative.
Vaisala Service Centers also offer accredited calibrations for humidity
and temperature. See contact information on page 42.
It is also possible to remove the HMP100 probe and replace it with a new
one. The old probe can be adjusted using another HMT100 transmitter
body, if you have one available.
NOTE RH Field Calibration and Adjustment, as instructed in the following
pages, is restricted to a certain adjustment range to minimize the effects
of special circumstances, such as chemical contamination. In case the
probe is outside its adjustment/trim range due to, for example, chemical
exposure, the calibration cannot be completed. In this case, it is
recommended that you change the probe or contact Vaisala Services.
Relative Humidity Adjustment Using
Push Buttons
0505-182
Figure 13 Adjustment Buttons
A simple push-button adjustment is carried out using two relative
humidity references: 11.3 % RH (LiCl) and 75.5 % RH (NaCl).
To carry out the adjustment, follow these instructions:
1. Remove the probe cover and the filter.
2. Open the transmitter cover.