Ametek 241CE II Operator's Manual page 142

6-28 | Model 241CE II Hydrocarbon Dewpoint Analyzer
To examine the push-buttons, their holes, and the Window Housing
assembly for damage and signs of wear, and to change out damaged or
worn parts (Figure 6-3):
1. Take appropriate safety precautions to safely power down the ana-
lyzer.
!
Before opening the Ex d Electronics Enclosure, follow all necessary
safety procedures to ensure the area is non-hazardous (main AC power
WARNING
to the analyzer is off, explosive gas atmosphere is not present, etc.).
Before performing maintenance on the analyzer, shut off the AC
power and all alternate power supplies (if used) to the analyzer.
2. Remove the (12) M6 x 16 screws on the Window Housing. Carefully
remove the Window Housing assembly and avoid scratching or nick-
ing 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-
CAUTION
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 off
before reassembling the Window Housing.
3. Carefully clean the push-buttons and remove any debris or other
substances 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 finish is worn, im-
WARNING
mediately replace all of the push-buttons and the Window Housing
assembly with new parts. Continue with Step 3.

If the push-buttons are not damaged or worn, you do not have to
remove them – continue with Step 4.
NOTE