4.25 APPI/APCI source—cleaning the lamp window
The transmission of the high-energy photons responsible for APPI relies on the cleanliness of the
magnesium fluoride lamp window. Clean the window to keep the surface clear of contamination,
and avoid reduced sensitivity.
Required materials
• Chemical-resistant, powder-free gloves
• Lint-free cloth
• Methanol or isopropyl alcohol
Warning:
To avoid burn injuries, take great care while performing this procedure.
Note:
To avoid eye injury from UV radiation, ensure that the APPI lamp is extinguished before
carrying out this procedure.
To clean the lamp window:
1.
Prepare the instrument for working on the source (see
Preparing the instrument for working
).
2.
Pull the source enclosure release (located at the bottom, right-hand side) outwards, and
swing open the enclosure.
3.
Use methanol or isopropyl alcohol, applied to the lint-free cloth, to carefully clean the lamp
window.
4.
Close the source enclosure.
5.
Slide closed the instrument’s source interface door.
4.26 APPI/APCI source - replacing the APPI lamp drive seals
Warning:
To ensure the integrity of the source exhaust system, the APPI lamp drive assembly
O-rings listed below must be renewed at intervals not exceeding one year, exactly as described in
this section.
The following APPI lamp drive assembly O-rings must be renewed at intervals of no greater than
one year:
June 9, 2016, 715004990 Rev. A
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