INFICON 2020ComboPRO Portable Photoionization Detector - Manual (Page 93)

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eventually evaporate off the window, but it will usually leave a residue that must be
removed by cleaning the lamp window.
Since some UV inhibiting deposits are invisible to the eye, regular cleaning of the
lamp window is strongly recommended. Clean the lamp frequently to prevent a
heavy buildup of deposits that may be difficult to remove.
WARNING
Do not remove the UV lamp in a hazardous location.
The UV lamp cleaning kit (Part No. MX380336) includes aluminum oxide powder
(3.0-micron powder) and cotton swabs. Additionally, you will require approximately
10 mL of methanol. When ordering methanol, specify purge and trap grade.
The instructions provided below are for 10.6 eV lamps. Refer to Cleaning the
Lithium Fluoride Window for special instructions to clean the 11.7 eV lamp
window.
CAUTION
Never touch the UV lamp window with your fingers.
To clean the UV lamp:
1. Remove the lamp as outlined in Removing and Replacing the UV Lamp
on page 84.
2. Allow the lamp to cool to room temperature to avoid thermal shock,
which could crack the window.
3. Dampen a cotton swab in methanol and dab it into the cleaning
compound. Allow a small amount of the cleaning compound to adhere
to the cotton tip.
CAUTION
Do not use methanol to clean the 11.7 eV lamp window.
4. Using small circular motions, rub the cleaning compound onto the lamp
window. Do not exert excessive force onto the window, since the
window can be permanently damaged by misuse.