ABB GLA451 User Manual page 97

USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
Sample Inlet Tee Connector
The diluted gas flows into analyzer through a T-connector that allows for steady flow past
the inlet to the analyzer. (Figure 91)
ABB-LGR recommends these T-connectors:
1/4" inlet: Swagelok SS-400-3
3/8" inlet: Swagelok SS-600-3
If you do not use the inlet tee, and connect the gases directly to the
analyzer, the mass flow controllers will not maintain proper dilution.
Depending on the sample concentration the mass flow controllers adjust the amount of
dilution:

Sample flow can vary from 0 to 200 SCCM

Zero-air flow can vary from 0 to 2.2 SLPM
Flow through the measurement cell should remain steady at approximately 180 SCCM or
less, with the excess flow vented out through the inlet tee.
Figure 91: Inlet T-Configuration for the EDDS
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