Thermo Scientific EA IsoLink IRMS System Operating Manual page 70

2
Analytical Principles
Pneumatic Circuit
Adjusting the Split Flow
The split ratio is managed by the valve block and an adjustable restriction, the needle valves on top of
the GC oven in the EA. See
Figure 38. Needle Valves
In general, there is no need to adjust the splits. It may become necessary if the restrictions after the
valve block (i.e. water trap, GC column) change or if the flow conditions (i.e. carrier gas flows) are
modified. This chapter is about the procedure to change the settings.
Note Any changes may have influence on the system performance and should be done only when
necessary and after reading this manual.
42 EA IsoLink IRMS System for CNSOH Operating Manual
Figure 38.
Needle Valve Holder
M
He Valve Block
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