Maintaining the FPD
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12
Maintaining Your GC 249
Cleaning the FPD
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Brazement
The FPD
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brazement, which consists of the transfer line and
emission block assemblies, uses an inert coating layer to
provide better performance. Normally, manually cleaning the
brazement is not required. However, if it becomes necessary to
clean the brazement to remove contamination, note that
exposing the inert coating to abrasives or certain solvents will
degrade the coating. If cleaning is needed, follow the
recommendations below for best results:
• Rinse with a solvent appropriate to dissolve the expected
contaminants. Avoid abrasive or highly basic solutions (see
the caution above). Recommended solvents:
dichloromethane, acetone, or methanol.
• Mildly sonicate if needed, but excessive sonication can
damage the coating layer.
• Gently remove solids using a soft, nylon bristle brush. Do not
scrub hard. Recommended brush: Use the MMI inlet cleaning
brush from the MMI cleaning kit (G3510-80820). (Do NOT
used the MMI inlet abrasive cleaning swab, G3510-80829.)
CAUTION
The brazement uses an inert coating layer. Abrasives may scratch this layer. Hard
scrubbing can scratch this layer. Solutions or soaps with a pH > 8 can also damage
this layer. Do not steam clean.