Hach-Lange DR 3900 User Manual - Manual (Page 119)

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Expanded programs
9. Select Options>Reminder to enter an automatic interval
when a standard analysis is required to be carried out.
10. Press On.
11. Select the required interval. Press OK to confirm the entry.
12. Select a unit for the interval. Press OK to confirm the entry.
6.8.4.2 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.