Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 80)

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3. The lamp may be very warm. Give it at least
15-20 minutes to cool down before
attempting replacement.
The lamp housing is the stainless steel
cover at in the lower part of this photo.
Note the four (4) captive thumbscrews.
When the housing is cool to the touch,
loosen the four thumbscrews.
4. Carefully lift the cover off as shown. The
lamp is now visible.
5. Loosen the two lamp screw terminals. Slide
the lugs out from under the screws.
Do not remove the screws from the
terminal strip.