Chapter 6 __________________________________________________ Calibration and Adjustment
VAISALA _______________________________________________________________________ 65
0605-016
Example 2:
Temperature scaling -40 ... +120 °C, reference 22.3 °C:
0605-017
Relative Humidity Adjustment
Automatic Two-Point Adjustment
(Only with HMT360 with Display)
The automatic adjustment procedure is a user friendly way to adjust the
HMT360 with salt solutions; you do not have to feed the reference
values to the HMT360. The transmitter displays the accurate value
based on the measured temperature and the Greenspan table stored into
the transmitter memory. The display chart of the adjustment procedure
is presented in
-
Set the internal DIP switch
Calibration Enabled/Disabled
to
position
ON
and select RH calibration by using switches 3 and 4
DIP Switch Functions on page 45
-
Remove the filter and insert the probe into a measurement hole of
the LiCl salt chamber in the humidity calibrator. Acknowledge by
pressing button
E
. Alternatively select the 0.1 (humidity in
nitrogen) with buttons
Up
and
Dn
. Acknowledge with button
E
.
-
The transmitter remains to wait for the process stabilization
(10 ... 15 min) and then stores the correction.
-
Insert the probe into a measurement hole of the NaCl salt chamber
in the humidity calibrator. Acknowledge by pressing button
E
.
Alternatively you can select K
2
SO
4
value with buttons
Up
and
Dn
.
-
The transmitter remains to wait for the stabilization and then stores
the correction. The text "Cal Pass" is displayed after the adjustment
is performed.
NOTE
Remember to restore the DIP switch settings.
I
4 mA
16 mA
22.3
°
C
40
°
C
–
120
°
C
40
°
C
–
--------------------------------------
⋅
+
10.230 mA
=
=
