Vaisala HMDW110 - Manual (Page 49)

2. Plug in the connection cable 219690 to the service port of the HMDW110
series transmitter, and the other end to a free USB port on your computer.
3. Remove the filter on the probe. This exposes the sensors to damage, so
handle the transmitter carefully.
4. Unplug the Ø12 mm hole on the LiCl (11 %RH) salt jar and insert the probe.
5. Wait at least 15 minutes for humidity to stabilize. Stabilization may take a
much longer time if there are temperature differences or the salt solution is
freshly made.
6. Start a terminal application on the computer and open a new terminal
session to the transmitter. For more information, see Terminal Application
Settings on page 23.
7. Give the errs and send commands to check that there are no active errors,
and that the measurement is working:
errs
0000h
No errors
send
T= 23.1 'C RH= 11.5 %RH Td= -7.3 'C Tw=
9.9 'C h= 28.5
kJ/kg
8. Give the l command to view the currently active user adjustment
parameters.
Example: default values of the user adjustment parameters (no user
adjustment done).
Cp offset : 0.00000000E+00
Cp gain : 1.00000000E+00
T offset : 0.00000000E+00
T gain : 1.00000000E+00
9. Give the crh command to start the calibration and adjustment sequence.
The transmitter shows the measured RH value and prompts you to enter the
real humidity of the first reference point.
crh
RH
: 11.5378 1. ref ?
47
5 Maintenance