9. Give the CRH command, with the %RH value of the reference as a parameter (in this case
11 for LiCl).
crh 11
OK
10. Check with the L command that the user adjustment parameters have changed.
More information
‣
Clear adjustment of RH measurement (page 47)
7.3.2 2-point adjustment of RH measurement (HMP110 and
HMP113)
You can also use Vaisala Insight software for performing calibration and
adjustment. See Vaisala Insight software (page 31).
To perform a 2-point adjustment to the capacitance measurement of the HMP110 or HMP113
using serial line you need:
• Vaisala USB cable (item code 219690)
• PC with a terminal application
• Two humidity references. The first point requires a < 50 %RH humidity reference, the
second point must be > 50 %RH. There must also be at least 30 %RH dierence between
the references.
The following procedure uses the HMK15 Humidity Calibrator. LiCl salt (11 %RH) is used as the
first reference point, NaCl (75 %RH) as the second.
1. Connect the USB cable to the PC, but do not connect it to the probe yet.
2. Remove the filter from the probe and insert the probe in the LiCl salt chamber of the
humidity calibrator (11 %RH).
3. Start a terminal application and set the correct connection settings. The default serial
settings are 19200 8 N 1. Remember to check which COM port the USB cable is using.
4. Wait for 20 … 40 minutes for the humidity to stabilize.
5. Start the terminal session and connect the USB cable to the probe. If your probe is in the
analog output mode, you need to press ENTER a few times to start it in RS-485 mode.
HMP60 and HMP110 Series User Guide M211060EN-J
58
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