
Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 21
Drilling Instructions for Duct Installation Kit
4
2
1
2
3
Ø
2
4
Ø
3
.2
0505-178
Figure 12 Drilling Instructions
The following numbers refer to Figure 12 above:
1 = Mounting screw
2 = Tension screw
3 = Probe assembled in duct installation kit plastic pipe
Drill the holes for the duct installation kit as follows:
1. Use a 24-mm drill bit to drill a hole to the duct wall for the
humidity probe.
2. Drill holes for the duct installation kit mounting screws around the
hole in a square arrangement, 42 mm apart from each other. Use a
3.2-mm drill bit to drill the holes for the mounting screws
(four ST4.2×16-C-Z DIN 7981 screws).
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