The Ion uses all 4 heads for sampling and testing. If you want to dose you will need an additional doser.
1. Water sample
2. Cal fluid A
3. Cal fluid B
4. Drain
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Related to these questions. If I want to dose Ca and Mg in a way regulated by the Ion Director, do I need a new doser 2.0 or 2.1, or the old generation dosers are OK?
This will also be possible with the old slave dosing units, since you can set a dosing pump as a switch channel function.