Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 142)

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Position the lamp with the black arrow up as
shown. Gently insert the lamp and mounting
plate into the lamp housing as shown.
Engage the holes over the studs. When all three
are in place, rotate the mounting plate counter-
clockwise (to the left) until they all lock in
position.
Verify that the black arrow on the lamp is aligned
with the machined groove in the lamp housing. If
not, gently rotate the lamp to get it into
alignment. This is required for proper operation
of the instrument.
This photo shows the black arrow in proper
alignment. Note that the lamp mounting plate is
in the correct position on the studs.
Insert lamp connector spade lugs, one at a time,
under each terminal screw.
There is no polarity requirement, so either wire
may be under either screw.
Tighten each terminal securely to assure good
electrical contact.