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.
dierent temperature than the measured
Figure 1 Recommended Installation using a Cable Conduit
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© Vaisala 2017
No part of this manual may be reproduced, published or publicly displayed in any form or by any means,
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ambiguous cases, the English versions are applicable, not the translations.
~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,
6
7
5
7
4
3
1
2
Installation Guide M211557EN-B
Assembling HMT330WPA
1. Bring the probes together as shown below. Insert the screw sleeve (7) over the probes and
connect them together with the sealing rubber (6).
2. Insert the first tube (5) over the probes and tighten it to the screw sleeve (7). Insert the small
white plastic support (4) to the cable at the base of the RH measurement probe. Route the cable
of the T probe so it rests in the cutout of the support. Push the screw sleeve so that the support
goes inside the tube.
3. Tighten the RH measuring tube (3) over the RH measurement probe. This is the tube with most
holes on the sides.
4. Insert the grommet (1) to the hole at the end of the T measuring tube (2). Then push the
temperature probe through the grommet and tighten the tube.
3 (4)
7
7
8
9
8
Installation Guide M211557EN-B
Mechanical Support Option 1: Cable Conduit
Connect the conduit to the PG 16 thread on the screw sleeve (7).
Figure 4 Supporting HMT330WPA with a Cable Conduit
Mechanical Support Option 2: M8 Threaded Bar
Attach the flange (9) to the screw sleeve (7) using the two M3 threaded bars (8). Use thread-locking
fluid to secure the bars. Then connect your M8 threaded bar to the flange.
Figure 5 Supporting HMT330WPA with a Threaded Bar
4 (4)
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