Hanna Instruments HI 903 - Manual (Page 34)

2-10
SETUP
Figure 6
2.3.4.3 Attaching the Beaker and Dispensing Tip
The titration reaction takes place in a closed, conical, glass beaker, sometimes called a
titration vessel, reaction vessel, titration cell or reaction cell.
The primary design features of the HI 903 titration vessel include the following:
• Durability, easy to use, clean and maintain.
• Conical, glass vessel body which provides strong, repeatable mixing for reaction
volumes between 50 and 150 mL.
• Tightly sealing PTFE cover with low water vapor permeability and high chemical
resistivity to Karl Fischer reagents.
• A sample port which can both be rapidly removed and replaced when adding solid
samples and incorporates a septum through which liquid samples can be injected.
• A desiccant cartridge containing molecular sieves and/or indicating silica gel to dry
the ambient air which enters the cell as solvent, titrant and sample are added to or
removed from the vessel.
• Fittings made from a highly chemically resistant material called PEEK which, in
conjuction with o-rings, create tight seals between the vessel top and the electrode,
dispensing tip, solvent and waste tubes, sample port and desiccant cartridge.
To attach the beaker assembly, see Figure 6 and follow the steps below:
• Align the beaker support (D) with the base plate and attach by rotating clockwise.