Duct or channel mounting – Vaisala GMT220 User Manual
Page 14
USER'S GUIDE____________________________________________________________________
14 __________________________________________________________________ M010022EN-F
Duct or Channel Mounting
When the probe is installed in a duct or channel, it is recommended to
use the optional mounting flange (GM45156SP).
1. Drill a hole with minimum diameter of 22 mm in the wall.
2. Attach the flange onto the duct with four screws so that the gasket
ring seals the attachment.
3. Place the probe through the flange so deep that the perforated
head is completely in the duct (see Figure 5 below).
0807-036
Figure 5
Gasket Ring
NOTE
If the air pressure in the duct is clearly lower than the surrounding air
pressure, an additional sealing may be necessary. This is to avoid
possible measurement errors due to leakages through the joint.