7.3 Calibration and Adjustment Using Handheld
Meter and Reference Probe
• A fully charged Vaisala MI70 indicator (the measurement display that is
included in the HM70 package)
• A calibrated reference probe that is compatible with the MI70 indicator (for
example, HMP75) and its MI70 connection cable, if not integrated with the
probe
• Connection cable for HM70 handheld meter (219980SP)
• Medium size cross-head screwdriver (Pozidriv).
1. Insert the reference probe in the same environment as the probe of the HMDW110 series
transmitter. You can also perform this procedure in the ambient environment, as long as it
is reasonably stable.
2. Connect the reference probe to port I of the MI70 indicator (the measurement display that
is included in the HM70 package).
3. 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.
4. Plug in connection cable 219980SP to the service port of the HMDW110 series transmitter,
and the other end to port II of the MI70 indicator.
5. Turn on the MI70 indicator.
6. Check and adjust the environment settings of the reference probe if prompted by the
MI70.
7. Select Functions > Adjustments (II) from the menu of the MI70, then select Start. Make
sure the symbol for port II is shown after the word "Adjustments", as your reference probe
may also be adjustable using the MI70.
8. The adjustment mode starts. Select OK.
9. Select the parameter for adjustment. You can only adjust relative humidity (RH) or
temperature (T). The rest of the parameters are calculated based on RH and T and can
only be viewed.
10. Check and adjust the environment settings of the reference probe if prompted by the
MI70.
HMDW110 User Guide M211726EN-D
56
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