Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 13)

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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.
Temperature probes are available, which offer the
option of monitoring process temperature. This is
especially useful in liquid streams.
Spectra may change slightly with temperature. The
data from the probes may be used to adjust the
calibration for temperature effects, for more consistent
results.