Vaisala HUMICAP MMT330 Guida Utente Pagina 43

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Chapter 3 ________________________________________________________________ Installation
VAISALA ________________________________________________________________________ 41
1. Preparing installation. The connector options are the following:
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. Probe position. 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. 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 the marks you drew. The
connector has now a gas tight connection to the probe. Excess
tightening can damage the probe.
d. 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).
Use teflon tape or thread sealant to seal the connection between the
Swagelok connector and the process; see Figure 24 on page 43.
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