If you have changed the HUMICAPâ humidity sensor of the transmitter, perform
the procedure below so that you use the FCRH command instead of the CRH
command.
1. Prepare the HMDW110 series transmitter for a service port connection.
a. Open the cover of the HMDW110 series transmitter.
b. If the terminal block for terminals 5 ... 8 is wired, pull it out. This disconnects the
transmitter from supply voltage and prevents possible equipment damage that may
be caused by ground loops. The locations of the terminal blocks and the service port
are shown in Component Board (page 13).
c. If the other terminal block is wired (terminals 1 ... 4), pull it out also. This prevents the
communication between the transmitter and the RDP100 remote display panel from
interfering with your connection.
2. Plug in 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 much longer if
there are temperature dierences 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 (page 31).
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
HMDW110 User Guide M211726EN-D
60
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