6.3 Adjusting RH and T with MI70 Hand-Held
Indicator
• MI70 hand-held indicator (included in, for example, the HM70 package)
• MI70 connection cable (Vaisala order code: 211339)
You can check and adjust the transmitter's relative humidity and temperature measurement
with the MI70 (HM70) Hand-Held Humidity and Temperature meter.
There are four types of adjustments available:
• Field checking and adjustment using a calibrated reference probe
• 1-point adjustment using a calibrator,
• 2-point adjustment using a calibrator,
• LiCl-NaCl adjustment
Start the adjustment by completing the
first 7 steps and then continue according to the
chosen adjustment method.
1. Connect the HM70 connection cable (211339) to the SERVICE PORT connector on the
transmitter's motherboard (see Figure 11 (page 21)).
2. Connect the other end of the connection cable to either of the MI70 connector ports (port
I or port II) located on the bottom of the indicator.
3. Turn on both devices (or just the MI70 indicator if the transmitter is on continuously).
4. The reading of the transmitter is shown on the top or middle row of the indicator display,
depending on which connector port the connection cable is connected to.
HMT120 User Guide M211244EN-C
56
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