Emerson Rosemount Apex Reference Manual page 33

Reference Manual
00809-0100-4731, Rev FA
April 2003
Figure 2-13. Diagram for
Installation without a Process
Window
™
APEX and APEX Sentry
NOTE
The tightening torque is dependent on the strength of the stud bolts and the
pressure rating of the vessel.
Mounting
Bolt/Nut
Installing with a Process Window
If you are installing the gauge with a process window, refer to Figure 2-14
and follow these steps:
NOTE
Make sure the metal gaskets are installed and the flange bolts are torqued
properly to keep moisture out of the spool piece. Bolts should be re-tightened
24 to 48 hours after initial installation.
1. Seat the process O-ring (7) into the groove on the window (6), and center
the window on the process flange without letting the
O-ring slip out of its position in the groove.
2. Make sure that the EMI gasket (8) is seated in the stainless steel window
ring (5), place the window ring over the window, and center a
spiral-wound gasket (4) over the window ring.
3. Center the standoff pipe or spool piece (2) on the flange. Put two of the
bolts (9) in opposite sides and hand tighten. Look inside the spool piece
to verify that the Teflon window is centered on the flange. (See Figure
2-15 on page 2-19.)
4. Once the Teflon window is centered, use the rest of the mounting bolts
and nuts to finish attaching the spool piece to the tank flange. A
misaligned window will severely hinder gauge performance. Tighten
the bolts to 75-100 ft-lbs (102-136 N-m).
NOTE
Visually inspect down the center of the spool to assure the window is
centered.
™
Radar Gauge
APEX Radar Gauge
Customer-Supplied
Gasket
Process
Flange
2-17