Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 12)

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Frequently the process interface is designed so that the
probe “barrels” are left in the process permanently, and
the fiber bundles are slid out for periodic instrument
qualification testing.
Interactance Immersion Probes are suitable for transmission-style measurements on clear to partly
clear liquids.
In this probe style, the beam is directed through the
sample to a protected mirror, then reflected (back
through the sample again) to the receiving channel. The
advantage is that a transmission measurement is made
with only one probe entrance into a vessel.
1.3 MicroBundle Fiber Information
“Micro-bundle” fiber is normally 40 fibers per source channel, and 40 fibers per receiving channel.
This is shown at right, compared to single fiber.
The dark spot at the center of the SMA connector is the
fiber in each type. Because the Micro-bundle has more
fibers, it has greater light-carrying capacity, and is
therefore capable of measurements on denser samples.