PN 903-8797, Rev A
To examine the push-buttons, their holes, and the Window Housing assem-
bly for damage and signs of wear, and to change out damaged or worn parts
(Figure 4-3):
1. Take appropriate safety precautions to safely power down the analyzer.
Before opening the Ex d Electronics Enclosure, follow all necessary safety
procedures to ensure the area is non-hazardous (main AC power to the
analyzer is o, explosive gas atmosphere is not present, etc.).
Before performing maintenance on the analyzer, shut o the AC
power and all alternate power supplies (if used) to the analyzer.
2. Remove the twelve (12) M6 x 16 screws on the Window Housing. Carefully
remove the Window Housing assembly and avoid scratching or nicking it
or the window.
If the Window Housing is stuck, do not attempt to dislodge it using
any tools that can scratch, nick, or otherwise damage it or the win-
dow. Do not use any force to dislodge it.
If necessary, use a lubricant suitable for the hazardous location to as-
sist in the removal of the Window Housing but ensure it is cleaned o
before reassembling the Window Housing.
3. Carefully clean the push-buttons and remove any debris or other substanc-
es from around their holes. The push-buttons should freely return to their
normal positions. At all times, be careful not to damage their surfaces.
If the push-buttons and/or their holes in the Window Housing are
indented, bent, scratched, or the blue anodized nish is worn, immedi-
ately replace all of the push-buttons and the Window Housing assem-
bly with new parts. Continue with Step 4.
If the push-buttons are not damaged or worn, you do not have to
remove them – continue with Step 5.
Maintenance and Troubleshooting | 4-33
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