Hanna-instruments HI 903 Manual do Utilizador descarregar pdf (Página 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.

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Hanna-instruments HI 903 Manual do Utilizador Página 34