Hanna Instruments HI 903 - Manual (Page 97)

6-5
TITRATION
6.4 Standby
After the drift rate has been determined, the HI 903 moves into Standby mode. In standby
mode the dryness of the titration cell is maintained and the drift rate is continuously monitored
and updated.
From Standby mode a sample analysis, titrant standardization or drift rate logging session
can be launched as well as method selection, customization of method parameters, and
general options (external keyboard only, by pressing <>).
After an initial titrator setup and prior to the first titration or standardization, the drift rate
should be allowed to settle in Standby mode for 45 min. This ensures that the drift rate is
stable and reflects the actual rate at which water vapor is entering the cell rather than
representing a slow drying of the air between the solvent and the top of the cell. The
stabilization can be verified by examining the drift rate vs. time curve which can only be
accessed from standby mode.
During standby, if the drift becomes unstable, the titrator switches back to Drift Analysis
mode.