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
2
 and may cause low 
readings, especially in new buildings. Seal the 
cable opening if necessary. 
 
EN