Vaisala HMT330WPA User Manual

Seal and insulate the
top of the cable conduit

Point the HMT330WPA downward

M211557EN-B

Installation

Warmed Probe Accessory

HMT330WPA

Guide

Overview

HMT330WPA is an installation kit for mounting the warmed probes of the HMT330 and PTU300
transmitters. The kit enables you to combine the warmed probe and the additional temperature probe
into an easily manageable unit that can be supported by a cable conduit or a threaded bar. Note the
following:

1. Install HMT330WPA pointing down to prevent condensed water from collecting inside it.

2. If using a cable conduit to support the HMT330WPA, seal the upper end of the conduit.

3. Install thermal insulation if external environment is in
space.

dierent temperature than the measured

Figure 1 Recommended Installation using a Cable Conduit

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© Vaisala 2017

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~90 [3.5]

Ø 6 [0.23]

Ø 25 [0.98]

Ø 28 [1.10]

215 [8.46]

17 [0.66]

Ø 25 [0.98]

L = Conduit length through insulation

mm
[in]

1

2

3

4

5

6

7

8

9

Installation Guide M211557EN-B

HMT330WPA Dimensions

Figure 2 HMT330WPA Dimensions

HMT330WPA Parts

Figure 3 HMT330WPA Parts

1 Grommet
2 Measuring tube (T)
3 Measuring tube (RH)
4 Support
5 Tube
6 Sealing rubber with two-hole cut
7 Screw sleeve adapter with PG 16 thread for

attaching a cable conduit

8 M3 threaded bar for connecting the flange (2 pcs)
9 Flange with M8 thread for threaded bar

2 (4)

The flange (9) and the short M3 threaded bars that connect it to the screw sleeve (8) are only needed
when supporting the HMT330WPA with a threaded bar.

Before starting, consider how you will support the
you must insert the probes through the conduit before assembling them into the HMT330WPA.

finished assembly. If you want to use a cable conduit,