Dräger Multi-PID 2, User Manual

Page: 82 / 107

82
Routine Maintenance
Cleaning the UV Lamp Window
During the course of normal operation, a film builds up on the window
of the UV lamp. The rate at which the film develops depends on the
type and concentration of the gases and vapors being sampled and
results from the UV light interacting with them.
Hot gases and vapors may contribute to a decrease in sensitivity
because they may condense on the lamp window. Condensation may
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 cle-
aning of the lamp window is strongly recommended. Clean the lamp
frequently to prevent a heavy buildup of deposits that may be difficult
to remove.
The UV lamp cleaning kit (Part No. 83 18 318) 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 Cle-
aning the Lithium Fluoride Window for special instructions to clean
the 11.7 eV lamp window.
WARNING:
Do not remove the UV lamp in a hazardous location.
WARNING:
Never touch the UV lamp window with your fingers.