Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 123)

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5. Loosen the two lamp screw terminals. Slide
the lugs out from under the screws. Do not
remove the screws from the terminal strip.
6. Twist the lamp retaining ring to the right,
and lower it from the heads of the
shoulder screws.
Remove the lamp assembly from the
instrument.
7. Carefully remove the ring from the lamp
wires. This ring will be re-used with the
new lamp.