16 Maintaining EPC Modules
Installing or Replacing Frits in the Aux EPC
258 Maintaining Your GC
Installing or Replacing Frits in the Aux EPC
To install or replace a frit in the Aux EPC block:
1 Gather the following:
• T-10 Torx screwdriver
• Appropriate O-ring and frit
• Tweezers
When hydrogen is used, dangerously high flows are possible if insufficient flow resistance is
provided downstream of the supply tube. Always use either the High (Blue dot) or Medium
(Red dot) frit with hydrogen.
2 Turn off the gas supply to the channel.
3 To select the appropriate auxiliary channel frit. See Table 41.
4 Identify which frit needs to be changed. Trace the tubing as needed to confirm.
5 Remove the screw to the molded partner fitting.
6 Lift the molded partner fitting away from the Aux EPC module.
7 Remove the tubing weldment for the desired channel. This will expose the frit and its
O-ring.
8 Gently remove the frit and O-ring using the tweezers. Be careful to avoid scratching the
metal surfaces.
9 Place a new O-ring onto the end of the new frit, and insert the frit into the open end of the
tubing weldment.
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