ROTRONIC MBW 373 - Manual (Page 14)

10
Swagelok
®
Tube Fittings
Swagelok
® brand tube fittings are generally used to connect the gas inlet and outlet tubes to the
373S, H, and HX systems. Depending on the configuration of your specific 373, the back panel
fittings are either ¼” or 6 mm. When ordering tube fittings from your local Swagelok
® supplier, be
sure to specify the correct size for your instrument. Swagelok
® tube fittings come to you
completely assembled, finger-tight and ready for immediate use. Disassembly before use is
unnecessary and can result in dirt or foreign material getting into fitting and causing leaks.
SWAGELOK
® Tube Fittings are installed in three (3) easy steps:
Simply insert the tubing into the SWAGELOK
®
Tube Fitting.
Make sure that the tubing rests firmly on the shoulder of the
fitting and that the nut is finger-tight.
Before tightening the SWAGELOK
®
nut, scribe the nut at the 6
o’clock position.
Hold the fitting body steady with a backup wrench and tighten the
nut 1-1/4 turns.
c Watch the scribe mark, make one complete
revolution and continue to the 9 o’clock position.
By scribing the nut at the 6 o’clock position as it appears to you,
there will be no doubt as to the starting position. When the nut is
tightened 1-1/4 turns to the 9 o’clock position, you can easily see
that the fitting has been properly tightened.
Use of a Swagelok
®
Gap Inspection Gage (1-1/4 turns from
finger-tight) ensures sufficient pull-up.
c For 1/16“, 1/8“, 2 mm, 3 mm and 4 mm size tube fittings, only ¾ turn from finger-tight is necessary.
Cajon
®
Tube Fittings
All low range systems, Models 373L and LX, are generally equipped with Cajon
®
VCR Face
Seal fittings that provide a true metal-to-metal seal. Mating Cajon
®
VCR fittings may be
obtained from your local Swagelok
® supplier.
Handling
A protective cap is placed on all VCR sealing beads to prevent nicks or scratches. Damage to
the sealing beads will affect the fitting performance and cause system leakage. This cap should
remain in place during storage and handling.
Note: Standard bead protection for VCR sealing beads is a plastic protective cap.
Assembly
Caution: VCR components with fixed threads must remain stationary during installation. Do not
allow the sealing beads to rotate against the gasket.
Remove the Original-style Gasket or Gasket Retainer
Assembly from its package.