Vaisala HMT140 - Manual (Page 23)

Mounting
M21488EN-C 15
Figure 2: Mounting Diagram
Note: It is strongly recommended that you use all four
screws; however, the HMT140 enclosure fasten-
ing holes are initially covered with a thin plastic
membrane, so less than four screws could be also
be used without sacrificing the ingress protection
(IP) class of the enclosure.
Duct Installation
The duct installation kit includes a plastic pipe with a flange
(Vaisala part#: 215619).
To install the HMP110 probe with the duct installation kit,
drill a hole into the duct wall, assemble the probe to the duct
installation kit, slide the probe head through the hole, and
attach the flange to the duct wall with four screws.