Vaisala HMT120 - Manual (Page 21)

Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 19
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).
Probe Mounting Flange
The probe mounting flange (Vaisala order code: 226061) is a general
purpose mounting flange for 12 mm diameter probes. It can be used to
hold the HMP110 probe in a through-wall installation.
NOTE The coaxial silicone plug that is delivered with the flange is not suitable
for use with the probe cable of the HMT120.
0911-109
Figure 9 Optional Probe Mounting Flange