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Thermo Fisher Scientific
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
3-13
Warning!
Both of the above compressed air supplies vent to atmosphere
at the analyser.
Due to the
risk of asphyxiation,
inert gases such as nitrogen
should not be used instead of compressed air. There is no
facility in either case to pipe away the spent gas.
Some, or all, of the following pump purge gas options may have
been ordered, depending upon the instrument application. These are
normally only necessary for applications involving condensable,
corrosive, or toxic sample gases. The purge gas is normally nitrogen,
though in some cases instrument air may be acceptable. All
connections are 1/4” or 6 mm compression.
A rotary oil box purge may be required to ensure a positive flow of
purge gas through the rotary pump oil box to dilute and sweep the
gases out into the rotary pump exhaust line. The purge gas flow
should be controllable up to 1 l/min (by means of an external control
valve and flow meter).
A rotary pump ballast purge primarily prevents formation of liquids
from any potentially condensable vapours being pumped, but it also
provides a general purge for the pump oil. The purge gas flow should
be controllable up to 5 l/min (by means of an external control valve
and flow meter).
A turbo pump bearing purge is used to protect the turbo pump
bearing when highly corrosive gases are being pumped. The flow
requirement is very low and is internally regulated. Nitrogen is the
preferred purge gas in this case.
Options
Pump Purge Gas
Rotary Oil Box Purge
Rotary Pump Ballast
Turbo Pump Bearing
Purge
