USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
Optional Fast Flow Mode
Analyzers with fast flow capabilities (external pump on/internal pump off) measure data at
a higher flow rate. Fast analyzers are equipped with an external throttle valve (Figure 7) to
tune the pressure of the system so the pressure in the gas cavity remains within the
pressure control range of the internal pressure controller during measurement. Details on
how to adjust the throttle valve are located in Appendix F: Fast Flow Operation on page
107.
The gas exiting the cell flows through the external pump pathway during fast flow. Both
the internal pump and external pump outlet flow paths are isolated by check valves to
prevent leakage from the flow path that is not in use.
Cap the
Internal Pump Exhaust
port with the provided ¼” Swagelok cap
during Fast-Flow operation.
Figure 7 shows the optional external high-flow throttle valve.
Figure 7: High-Flow Throttle Valve
The optional external pump draws gas through the
Sample Inlet
Swagelok port on the back
panel of the analyzer, and the waste is exhausted through the
To External Pump
Swagelok
port when set to Fast Flow Mode.
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