Hanna Instruments HI 904, Uick Start Manual, Page: 87 / 180

6-5
TITRATION
6.4 Standby
After the drift rate has been determined, the HI 904 moves into Standby mode. In standby
mode, the dryness of the titration vessel is maintained and the drift rate is continuously moni-
tored and updated.
From
Standby mode, a sample analysis, or drift rate logging session can be launched as
well as method selection, customization of method parameters, and general options (exter-
nal keyboard only, by pressing <<Home>>).
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.