Waters Quattro Premier XE, Operator'S Manual, Page: 55 / 86

Cleaning the lamp window 4-7
12. Fit the APPI lamp drive assembly to the source enclosure and perform a
source pressure test.
See also:
“To install the Combined APPI/APCI Source” on page 2-5 ,
step 12 through step 19 .
Cleaning the lamp window
The transmission of the high-energy photons responsible for APPI relies on
the cleanliness of the magnesium fluoride lamp window. The window should
be cleaned 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
To clean the lamp window
1. On the MassLynx Tune window, click Press for Standby, and confirm
that the instrument status indicator is red.
2. Wait for three minutes for the desolvation gas to cool the probe and
source.
3. Click to stop the nitrogen flow.
Warning:
To confirm the integrity of the source exhaust
system, you must perform a pressure test on the source, as
described in the Waters Source Pressure Test Unit
Operator’s Guide .