Hach-Lange DR 3900 User Manual - Manual (Page 55)

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Standard programs
9. Select the required data analysis interval.
It is possible to select a fixed interval and an specific
customised interval with start and end dates.
10. Press OK to confirm.
11. Choose an upper and lower control limit for the first and
second parameters and press Next to confirm.
12. All of the selected functions are displayed in Ratio Settings.
Press OK to confirm.
13. Select the ratio with the defined settings from the ratio
directory. Press Select.
A table with the defined values is shown.
Values outside the defined limits are displayed in red.
5.3.4.3 Interference Check (not available on all models)
The DR 3900 automatically tests for interfering ions. Typical
interferences, such as chloride for nitrate, are recognised from
defined concentrations and a warning is displayed. This check is
only carried out for barcode tests that are indicated with identical
sample IDs.