Thermo Scientific EA IsoLink IRMS System Operating Manual page 71

Pneumatic Circuit and Measuring Points
Figure 39
Here you must disconnect the lines and connect to a flow meter. The split ratio of combustion side
should be 130/50 mL/min where 130 mL/min are fed back into the purge line and 50 mL/min go
through the GC column.
Note The flow through the GC column should not exceed 60 mL/min in analytical conditions.
Figure 39. Simplified Pneumatic Circuit
1. Make sure you are in combustion mode (arrow points to NCS).
2. Make sure V2 Comb is on.
3. Set carrier flow to 180 mL/min and the reference flow to 70 mL/min.
4. Disconnect the purge line of your autosampler (see measuring point TP1 in
measure the flow. It should read 200 mL/min (±2 mL/min).
−
−
5. Now remove the line to the ConFlo (or SmartEA, measuring point TP2 in
at the exit of the EA. It should read 50 mL/min (±2 mL/min).
CAUTION The needle valves are very sensitive. It is best if the fixing nut is already fixed before you
use the screwdriver. This allows a finer adjustment.
Thermo Scientific
is a simplified pneumatic circuit of the Flash IRMS. It shows two measuring points "TP".
If the flow is higher, use a screwdriver to gently close needle valve V2 turning it
counter-clockwise.
If the flow is lower, use a screwdriver to open the needle valve turning it clockwise.
Figure
EA IsoLink IRMS System for CNSOH Operating Manual
2
Analytical Principles
Pneumatic Circuit
Figure 39) and
39) and measure
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