Process Windows - Emerson Rosemount Apex Reference Manual

™
APEX and APEX Sentry

PROCESS WINDOWS

Figure 2-12. Using a PTFE
Process Window with the APEX
Radar Gauge
2-16
™
Radar Gauge
The process window typically consists of a PTFE cone that goes below the
gauge antenna and fits in the tank nozzle (see Figure 2-12).
and coating run off of the cone and corrosive processes cannot reach the
antenna. Window installation requires a spool piece that surrounds the
antenna. (See page A-9 for further information.) The length of the spool
piece should allow the end of the antenna to be within 1 inch (25mm) of
the window.
Install the window as shown on page 2-16 and page 2-17.
Spool Piece
PTFE Window
and Process
Wetted O-ring
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 to ensure a tight seal, to prevent
moisture from entering the area, and to meet the pressure needs.
Consult the factory for temperature and pressure limits when using a process
window. See page A-6 for APEX Radar Gauge and process window pressure
and temperature ratings.
Installing without a Process Window
If you are installing the gauge without a process window, refer to Figure
2-13 and follow these steps:
1. Place a gasket on top of the tank flange. (Choose a gasket type
according to process compatibility.)
2. Position the antenna into the tank flange standoff.
3. Check to see that the gauge is positioned so the conduit openings face
the proper direction for wiring.
4. Secure the gauge flange to the tank flange.
5. Tighten the flange bolts when the gauge is properly positioned.
(1) Further window information is detailed on page 2-16 and page 2-17.
Reference Manual
00809-0100-4731, Rev FA
April 2003
(1)
Condensation
APEX Radar Gauge
Metal Gasket
Tank Nozzle