Metrohm NIRS XDS Process Analyzer – MicroBundle - Manual (Page 11)

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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.
Considerations for each type of fiber are summarized below:
Single Fiber Micro Bundle
Sample Type
Fiber distance from Analyzer
Cost per meter
Clear Liquids
100-200 meters maximum
Inexpensive
Cloudy to turbid liquids
Up to 50 meters
More expensive
1.4 XDS Process Options
Multiplexed systems are used where several channels
are required. An optical switching device is used to
monitor the sample channels one at a time, in
sequence. (This is called time-division multiplexing.)
This is suitable for both micro-bundle and single fiber
systems. Any system with more than one sample
channel uses a multiplexer assembly as shown.
A Fiber Optic Communication Modem is included with
all Purged Systems. This permits communication by
fiber optic communication pair, for safe operation in
classified environments.
Communication cable must be specified, of a length
long enough for all runs, plus additional length for
service loops.
Communication cable should be handled carefully to
avoid breakage. Avoid sharp bends, chafing, or other
damage.