Vaisala DMT152 - Manual (Page 13)

Chapter 2 ___________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 11
Transmitter Structure
When the transmitter is delivered, the filter is protected by a yellow
transport protection cap that keeps the sensor dry. The transport
protection cap should be left on the transmitter during storage. Remove
the transport protection cap before installing the transmitter.
The transmitter body does not have user serviceable parts inside, and is
not designed to be opened. Opening the transmitter will void the
warranty.
0710-151
Figure 1 Dewpoint Transmitter DMT152
1 = 4-pin M8 connector I: analog output channels and operating
power
2 = 4-pin M8 connector II (shown with protective cap):
digital output (RS-485) and operating power
3 = 30mm nut
4 = DRYCAP
®
sensor protected with stainless steel mesh filter
(see Figure 21 on page 56)
5 = Connection thread: ISO G1/2", NPT 1/2", UNF 3/4"-16 2A, or
UNF 5/8"-18
When installing a DMT152 transmitter with ISO or UNF thread, use a
sealing ring to achieve a tight installation. Three copper sealing rings are
provided with the transmitter, and more can be ordered from Vaisala.
Note that the sealing rings for ISO and UNF threads are different. See
section Spare Parts and Accessories on page 66.
NOTE Do not use a sealing ring with the NPT thread. Instead, seal the thread
using PTFE tape or PTFE paste sealant.