USER MANUAL | ICOS | INSTRUCTIONS | UM/ICOS-EN REV. B.2
DCS Tab
The External Dynamic Dilution System (EDDS) is an optional accessory.
The EDDS is an ABB-LGR accessory that dilutes sample gas with zero-air whenever the
concentration rises above the target. It extends the upper range up to 100x through
automated dilution and maintains the target concentration at that level.
The EDDS can be enabled/disabled using the radio buttons, and the dilution factor can be
set using the drop down selection box on the DCS screen. (Figure 48)
See the Appendix F:External Dynamic Dilution System (Optional) on page 102 for detailed
instructions on setting up and operating the EDDS.
Figure 48: Dilution Control System (DCS)
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