Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact User Manual

Page 40

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The illumination fiber bundle (or pair, if Dryer
Probe) must be attached to the proper SMA
connection port on the lamp box for correct
operation. In this instrument, white light is sent to
the sample channel only when commanded by the
software. Therefore it is essential that the channels
be hooked up correctly.

This photo shows the numbered channel positions.
(They are not numbered on the unit.) Fibers are
attached before shipment, and are tested in those
positions.

The unmarked position (with fiber attached) is the
internal reference fiber, which is routed to the
entrance slit of the monochromator.

Tightening torque is 8 in-lb (0.9Nm). Do not exceed the recommended torque.

This diagram shows the layout of the lamp hookup
area. Verify that the sample channel(s) are properly
routed.

Again, fibers are attached and tested at the factory
prior to shipment. Do not remove fibers unless
absolutely necessary. Where only one sample fiber
is used, a black cap may be present over the CH2
port.

If fibers must be removed, label each one to
indicate where it should be re-attached.

A suitable wrench is the NC-100 with 5/16” (about
8mm) head, made by Seekonk Manufacturing Co.,
Seekonk, MA 02771, USA. Remove caps from
unused channels to facilitate access, then replace
caps. The head on the NC-100 is large, and may be
hard to turn if caps are not removed before use.

This photo shows where the reference fiber is
attached to the input slit of the monochromator.
Do not remove this assembly; it is shown for
familiarization purposes only.

Note that the fiber is split just beyond the cylindrical bezel. One branch is from the lamp box, and the
other is from the sample channel.Because light will be received from only one channel at a time, the
fibers are combined. The software knows which channel is receiving light at a given time.

Manual section 14.0 explains disassembly of lens barrel from the fiber bundles. In many cases the
lens barrel is mounted first, then the fiber is inserted, to minimize stress on the fiber bundle assembly.