Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 69)

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Be sure the filter material is positioned correctly,
and is not wrinkled or folded. There should be no
gaps at the edges.
Starting at the top, snap the frame into place.
When all four snaps are in place, the face of the
filter frame should be parallel to the back plate of
the instrument.
When finished, re-install the power cord if
removed earlier. Instrument power may be turned
on.
8.3 Lamp Replacement
The lamp may need to be changed after several thousand hours of use. Generally the instrument will
exhibit high noise during Performance Test, or when wavelength precision (repeatability) has begun
to rise from established values.
CAUTION:
Let the lamp cool for about 10-15 minutes before
attempting to remove it – it may be very hot.
Follow this replacement procedure:
Turn off power at the power switch located on
the back panel.