Vaisala CARBOCAP GMW90 Series - Selecting Location; Figure 9 Selecting Transmitter Location

User's Guide _______________________________________________________________________
24 ___________________________________________________________________ M211659EN-C
Selecting 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.
1111-070
Figure 9 Selecting Transmitter Location
Use the mounting holes to attach the mounting base securely. Use at least
two screws (not included, max screw diameter 4 mm). Remember to
leave sufficient clearance below the transmitter to operate the slide. For
mounting dimensions, see section Dimensions in mm on page 83.
NOTE
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.
NOTE
Ambient pressure has a significant effect on CO
2
measurement. If the
elevation of the installation location is more than 100 m (328 ft) from
sea level, make sure you are compensating for the effect of lower
pressure. See Effect of Pressure on CO
2
Measurement on page 65.