Metrohm 944 Professional UV/VIS Detector Vario - Manual (Page 36)

6.5 Replacing the VIS lamp
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944 Professional UV/VIS Detector Vario (2.944.0010)
2 Fastening the UV lamp
Slide the fastening ring over the cable of the UV lamp and screw it to
the lamp cooling element.
3 Connecting the UV lamp
Plug the plug of the UV Lamp into the connection socket UV of the
instrument and secure it with the fastening ring.
6.5 Replacing the VIS lamp
NOTE
A description on how to replace the VIS lamp (6.2804.050) is described
in the leaflet supplied with the VIS lamp.
6.6 Adjusting the lamp settings
The lamp settings are set correctly at delivery.
CAUTION
The lamp settings may be adjusted only in the following cases:
￭ After initial start-up, if the the check of the intensity spectrum shows
a cut-off (see Figure 8, page 22).
￭ After having replaced the UV lamp (see Chapter 6.4, page 25) or the
VIS lamp (see Chapter 6.5, page 28), if the check of the intensity
spectrum shows a cut-off (see Figure 8, page 22).
Before each adjustment of the lamp values, it is mandatory to check the
intensity spectrum. The lamp settings may only be adjusted if the intensity
spectrum is cut off at the top.
Adjusting the lamp settings
Before you can adjust the lamp settings, all the following preconditions
must be unconditionally met:
￭ The UV lamp has been burning for at least 30 minutes.
￭ The flow-through cell is clean.
￭ The flow-through cell is rinsed with ultrapure water.
￭ The flow-through cell is free of air bubbles.