Metrohm 944 Professional UV/VIS Detector Vario - Manual (Page 33)

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6 Operation and maintenance
944 Professional UV/VIS Detector Vario (2.944.0010)
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6.3 Door
CAUTION
The door is made of PMMA (poly(methyl methacrylate)). It must never
be cleaned with abrasive media or solvents.
CAUTION
Never hold the instrument by the door when lifting or moving it.
6.4 Replacing the UV lamp
After a a prolonged burning time, the radiation of the UV lamp starts to
decrease, which can be noticed by an increased noise on the baseline.
Check the effective burning time on the operating hours counter fixed to
the cable of the lamp. This counter measures the effective hours of opera-
tion and displays them on a scale.
0 2000 HOURS
Figure 9 Operating hours counter
The UV lamp must be replaced if the noise on the baseline becomes too
strong or when the lamp does not ignite.
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2
3
4
5
Figure 10 Lamp module
1 Lamp cooling element 2 VIS lamp holder