INFICON 2020ppbPRO Portable Photoionization Detector - Manual (Page 84)

78 ISP-074-576-P1D 78
Figure 21. Removing the UV Lamp
NOTE: Do not force the lamp into the lamp holder.
5. Replace the lamp housing cover. Tighten the cover down. Do not over
tighten.
6. Calibrate the 2020ppbPRO and then continue normal operation.
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 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.