
Chapter 3 ________________________________________________________________ Installation
VAISALA________________________________________________________________________ 33
lengthening
piece (pipe)
max. 50 125 8
2
ø105
ø88.9
ø84.9
ø118
welding mounting
pipe
M6×16 DIN912
AISI 316
0605-023
Figure 21 Mounting Flange Dimensions in mm
General Probe and Cooling Set
Mounting Instructions
Follow these general mounting instructions to make the installation.
Note the additional instructions in the following sections regarding
specific situations (mounting with process shut down, mounting with
process running, removing the transmitter for maintenance).
Appendix A, Example Installation of DMT346 on page 135 provides
photographs of installating DMT346 transmitter through a process
wall.
The probe should be installed horizontally whenever possible in order
to ensure the best possible performance of the cooling set. Install the
probe according to the following instructions (see also Figure 22 on
page 34):
1. Make a round 89.5 + 0.5 mm hole on the process wall.
2. Weld the tube of the mounting flange tightly on the inner metal
plate of the process wall. If the process wall is more than 125
mm thick, a lengthening piece (max. 50 mm) can be welded on
the mounting tube (for walls thicker than 175 mm, see Figure 23
on page 35).
3. The cooling set is mounted in a vertical position. Tighten the
screws properly in order to ensure a thermal contact.
4. Unscrew the locking screws on the cooling bar so that you can
push the sensor head into the bar.
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