Hanna Instruments HI 903 - Manual (Page 77)

5-13
METHODS
5.5.10.1 Sample Determination
This screen allows the user to select the sample determination mode.
Normal sample determination is performed through direct titration of samples that are soluble
in solvent or are finely divided and have homogeneous distribution in water.
External extraction is a method for the preparation of insoluble samples that require an
external water extraction. Using the proper solvents the sample is broken down into a fine
suspension from which, the water is extracted and released into the solvent.
External dissolution is a method for the preparation of the following types of samples:
• samples with a very high water content.
• samples that do not exhibit a homogeneous water distribution.
• slow-dissolving samples
• samples that can contaminate the titration vessel, thus reducing the accuracy, precsion,
number of titrations between solvent changes and raising the cell maintenance
requirements.
5.5.10.2 Sample Name
This screen allows the user to enter a name for the sample (up to 14 characters). Use the
arrow keys to navigate through the character table. Press
to add the highlighted
character to the sample name.