Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 17)

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The vent system is designed to maintain positive pressure inside
the XDS Process Analytics Instrument. The vent contains a flapper
valve, shown at right.
The flapper valve allows controlled air to escape from the XDS
Process Analytics Instrument enclosure. The air exits through a
spark arrestor, as shown. With the cover in place, this serves as a
safe exit for purge gases.
Do not disassemble the vent housing except as specifically
instructed. This is not a user-serviceable item. Any alteration to the
vent assembly will void the protection provided by the purging
system.