Hanna-instruments HI 904 Uživatelský manuál stáhnout pdf (Strana 52)

4-6

GENERAL OPTIONS

4.5 Language

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4.6 Reagent Exchange Reminder

Coulometric Karl Fischer reagents have a limited titration capacity, meaning that there is a

limited amount of water that a volume of reagent can react. For this reason, the HI 904

automatically tracks the total amount of water that has been reacted since the reagent was

added to the titration vessel. By default, an “Exchange Reagent” reminder will appear after

1000 mg of water have been titrated.

Coulometric Karl Fischer reagents also have a tendency to produce precipitates and

foul-smelling sulfurous compounds. This is particularly problematic when using a diaphragm

generator due to the risk of clogging the diaphragm. Most reagent manufacturers recommend

changing the reagent (anolyte and catholyte) weekly regardless of the amount of use. The

HI 904 can automatically track the elapsed time since the reagent was added to the titration

vessel by setting a reminder timer.

Both reminder types (timer and water counter) are automatically reset after using the air

pump. The reminders can be manually reset by selecting the “Reset Reminder” option.

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Hanna-instruments HI 904 Uživatelský manuál Strana 52