Vaisala HMW90 Serie Guide Rapide page 7

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Selecting the Location
The conditions at the location should represent well the
area of interest. Do not install the transmitter on the
ceiling. Avoid placing the transmitter near heat and
moisture sources, close to the discharge of the supply
air ducts, and in direct sunlight.
Plan the routing of the cable when selecting the
location. You can bring the cable to the transmitter
from above, or from the center opening of the
mounting base.
When bringing a cable through the wall, note
that the hole may also supply air from outside
the room into the transmitter. This may affect
the measurement readings. For example,
fresh concrete binds CO
readings, especially in new buildings. Seal the
cable opening if necessary.
and may cause low
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