Thermo Scientific Accela UV/Vis Plus, Hardware Manual

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1
Introduction
Lamps
Thermo Scientific Accela UV/Vis Detector Hardware Manual 5
Lamps
The UV/Vis detector has two lamps. The tungsten (W) lamp emits light in the visible region,
and the deuterium (D2) lamp emits light in the ultraviolet region. With use, the deuterium
lamp emits less and less light before it fails to ignite (
Figure 7 ). In contrast, the light output
from the tungsten lamp remains relatively constant until the lamp fails.
Figure 7. Deuterium lamp intensity versus lamp usage hours
The deuterium lamp typically requires a warm-up time of 20 to 30 minutes. However, for
applications that demand great sensitivity, allow a warm-up period of 1.5 hours.
The tungsten lamp typically requires only 15 minutes of warm-up time.
The deuterium lamp has a lifetime of approximately 2000 hours and the tungsten lamp has a
lifetime of approximately 2500 hours. Lamp lifetime varies depending on the application.
IMPORTANT The intensity of the deuterium lamp falls off very slightly over a period of
time after it is turned on. Before collecting data in the spectral range of the deuterium
lamp, wait at least 1.5 hours for the lamp to stabilize after a cold start.
Note Turning on the instrument automatically ignites the lamps. If the lamps have been
turned off, you must load a method and wait for the lamps to warm up before you
proceed with a run.
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0 500 1000 1500 2000
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Life (Hours)
Relative Intensity