Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 135)

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5. Probes are generally mounted in pressure
vessels (and other locations) using
Swagelok™ fittings such as that shown.
Nominal inside diameter is 1.00”.
Always follow Swagelok recommendations
for proper pressure sealing. Any deviation
from instructions may result in leaking.
6. A “probe purge port” is provided on each
lens barrel. This may be used to introduce a
vacuum on the inside of the lens barrel of
the probe. On high temperature vacuum
vessels, this technique minimizes pressure
stress on the probe window.
If used, remove the 1/16”set screw using a
3/32” Allen wrench. Use a suitable 1/16”
NPT fitting to connect.
15.1.1 Use of non-threaded lens barrel (existing systems)
Users with permanently installed, non-threaded
lens barrels may upgrade to the new
XDS Process Analytics instrument. The older lens
barrels are not threaded.
The snap ring must be loosened enough to slide
the knurled collar back, for access to the set
screws.
Window gapping may be an issue with retrofits.
Consult factory for proper procedure.
After tightening the set screws, move the snap
ring into the groove to retain the knurled knob.
This protects the set screws from dirt and
tampering.