Chapter 4 ______________________________________________________________ Maintenance
VAISALA_______________________________________________________________________ 51
Calibrating and Adjusting Relative
Humidity
1. Check that the MI70 indicator is connected to the HMP155, and
turn it on. Set the correct time, date, and environmental settings
(pressure compensation) if prompted.
2. Start the chemical purge from the Functions menu, if available.
After the chemical purge is complete, allow sufficient time for the
probe to reach ambient temperature before continuing.
3. Uncover the adjustment buttons on the HMP155 probe by
removing the protective cover and removing the calibration seal.
Refer to Figure 22 on page 51.
0801-076
Figure 22 HMP155 Adjustment Buttons
where
1 = Protective cover
2 = Down button
3 = ADJ button
4 = Up button
5 = Protective plug
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