Hach-Lange DR 6000 User Manual - Manual (Page 125)

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Expanded programs
11. Select the required interval. Press OK to confirm the entry.
12. Select a unit for the interval. Press OK to confirm the entry.
6.7.4.2 AQA Addition
Analysis of an addition solution allows for a check for errors and
interferences in the sample.
1. Press AQA Addition.
2. Press On.
3. Enter the required interval, and the system will automatically
issue a prompt to add an analysis. Press OK to confirm the
entry.