Vaisala MMT310 User Manual
Page 27
Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 27
Mount the MMT317 as follows:
1.
Select the correct connector for the installation. The connector
options are:
a.
R3/8" ISO (Swagelok code SS-12M0-1-6RTBT)
b.
1/2" NPT (Swagelok code SS-12M0-1-8BT)
Note that the connector inner diameters extend for Ø12 mm probe.
2.
Check that the probe position is correct. Before the final tightening
check that the upper edge of the connector nut is in line with the
upper edge of the probe. Otherwise the sealing may not be gas
tight.
3.
Ensure gas-tight sealing:
a.
Turn the connector nut finger tight and draw a vertical mark
on the nut and the fitting body.
b.
Be sure that the probe position follows step 2.
c.
Tighten the connector nut with a wrench 1 and 1/4 turns
(360º +90º) with the help of marks you drew. The connector
now has a gas tight connection to the probe. Excess
tightening can damage the probe.
d.
The connector can be disconnected and re-installed. In re-
installation first turn the connector nut finger tight and then
with wrench 1/4 turn (90º).
4.
Use teflon tape or thread sealant to seal the connection between the
Swagelok connector and the process (see Figure 6 on page 21).