Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 9)

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The “X-Purge” unit comes in either the fan-cooled
version (shown), the air-conditioned enclosure, or
the Vortec-cooled version.
The Vortec-cooled system may be used in Div. 1
areas as defined under NEC 500 standards, and in
Zone 1 areas as defined by IEC/CENELEC and NEC
505 requirements. The air-conditioned unit is limited
to Div. 2 areas.
The BEBCO purge system supplies clean instrument
air or inert gas to remove flammable vapors, and to
prevent accumulation of ignitable dust within the
protected XDS Process enclosure. The XDS Process
Analytics Instrument is therefore protected against
combustion, heat, moisture, dust build-up and
corrosion.
This unit is described more fully in section 2.0 of this
manual.
The XDS Process Analytics Instrument has an
Indicator LED panel to show functions. The LED
panel shows Lamp on, and Communications
operating. The last LED indicates Scanning.
This is a functional diagram of the XDS Single Fiber Analyzer, showing one Transmission Probe, and
one Transmission Cell. Note the Lamp Box, Reference Channel, and Multiplexer.