Xylem TitroLine 7800 Mode D'emploi page 225

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Depending on the application and duration, the time unit is defined in second, minute or hour (Fig. 169).
Fig. 169
For example, measurements up to 2 hours can be entered in seconds (Fig. 170).
Fig. 170
With a measuring interval of 60 seconds, that would be a total of 120 readings.
Up to 1000 measuring points can be recorded for a pH-Stat titration (Fig. 171).
Fig. 171
Even if the measuring interval is set to 60 seconds, or 5 hours, the pH value is still maintained constant over
the entire period. The number of measured values does not affect the titration control.