Owner manual

n The second point (high point) affects measurement gain. For humidity

adjustment, the high point must be > 50 %RH.

Additionally, two-point humidity calibration requires that the difference between

the two points is ≥ 30 %RH.

Temperature adjustment points must be in range -40...+60°C (-40 ... +140 °F)

with more than 30 °C (86 °F) difference.

Calibration and Adjustment Using a Hand-Held

Meter and a Reference Probe

n A fully charged Vaisala MI70 indicator (the measurement

display that is included in the HM70 package)

n 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

n Connection cable for HM70 hand-held meter (219980SP)

n 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 as

instructed in section Connecting to the Service Port on page22.

4. Plug in the 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 and 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.

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