APPI/APCI source—replacing the APPI lamp drive seals 4-115
Fitting the new APPI lamp drive assembly O-rings
Required materials
• Chemical-resistant, powder-free gloves
• 3-mm Allen wrench
• Small Phillips (cross-head) screwdriver
•Small Pozidrive screwdriver
• 1:1 methanol/water
• Lint-free cloth
To fit the new APPI lamp drive assembly O-rings:
1. Ensure that all the grooves for the O-rings are free from dirt and hair.
Tips:
• If contamination is present, use 1:1 methanol/water, applied to the
lint-free cloth, to carefully clean the grooves.
• For the asymmetric O-ring seals, first seat the O-ring in the small
radius at the bottom of the groove. Then use a suitable tool, one with
a circular cross-section, to “roll” the remainder of the O-ring into the
groove.
2. Fit the lamp bulb sealing O-ring in the lamp aperture.
3. Fit the two new O-rings inside the lamp mounting flange.
4. Fit the new lamp mounting flange O-ring to the APPI source enclosure
side.
Warning: The lamp drive assembly components can be con-
taminated with biohazardous and/or toxic materials. Always
wear chemical-resistant, powder-free gloves while perform-
ing this procedure.
Caution: Take care not to damage the APPI lamp drive assembly
O-rings when fitting them. Small nicks, tears, dirt, and dust can
compromise their performance, leading to rapid deterioration in
the assembly’s operation.
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