3. Plug in the charger socket of MI70 and connect the charger socket to a wall socket.
4. Connect the GMP220 series probe to the probe connector of GM70PUMP.
5. Insert the probe in the measuring chamber. Note that to have a tight installation, the 2 O‑rings on the opening of
the measuring chamber should not match together with the filter edge or the tapes on the probe (see Figure 1).
When operating the pump, especially when taking a sample from hot and humid conditions into room
temperature, take care that no condensation forms on the probe.
6. Install the other end of the sampling tube to the sampling location.
7. Switch on the MI70 indicator.
8. Switch on GM70PUMP.
9. The basic display opens. Wait for a few minutes to get a stabilized reading. For the most accurate readings wait
for 15 minutes to reach the full operating state of GM70.
Figure 1. Correct connection of GM70PUMP
1 For a tight connection, match the 2 O-rings together with the smooth probe surface.
The battery indicator of the MI70 display does NOT show the actual recharge level when the pump is in
operation.
Measuring multiple parameters simultaneously
MI70 is a generic indicator that can be used with Vaisala interchangeable dew point (DM70 series), humidity
(HM70 series), carbon dioxide (GM70 series), and moisture in oil (MM70 series) probes. Two different types of probes
can be connected to MI70 simultaneously.
1. Switch off the MI70 indicator.
2. Connect the 2 probes to the connector ports (port I and II) on the bottom of the indicator.
3. Switch on MI70.
4. Check that the environment settings of the probes in port I and II are the same if you are taking measurements
from the same condition. In this case, select Yes when MI70 prompts you to check the environment settings.
5. When measuring humidity and CO
2
simultaneously, you can use the HMP70 probe's temperature data to
compensate the CO
2
measurement.
a. Select temperature (T) and press Set.
b. MI70 asks if you want to link the measured T value to environment parameter: to link, press Link and
then press Exit.
6. The reading of the probe in port I is now displayed on the upper row(s) and the reading of the probe in port II on
the lower row(s) of the MI70 display.
Figure 1. Display example with carbon dioxide and temperature and humidity probes connected
simultaneously
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