Hanna-instruments HI 96750 Manual do Utilizador descarregar pdf (Página 12)

• Whenever the cuvette is placed into the measurement cell, it

must be dry outside, and completely free of fingerprints, oil

or dirt. Wipe it thoroughly with HI 731318 or a lint-free

cloth prior to insertion.

• Shaking the cuvette can generate bubbles in the sample, causing higher readings. To obtain

accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.

• Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost.

• It is possible to take multiple readings in a row, but it is recommended to take a new zero

reading for each sample and to use the same cuvette for zeroing and measurement.

• After the reading it is important to discard immediately the sample, otherwise the glass

might become permanently stained.

• All the reaction times reported in this manual are referred to 20°C (68°F). As a general rule

of thumb, they should be doubled at 10°C (50°F) and halved at 30°C (86°F).

• In order to maximize accuracy, prior to a measurement follow the validation procedure to

be sure that the instrument is properly calibrated. If necessary, calibrate the instrument.

• Proper use of dropper:

(a) to get good reproducible results, tap the dropper on the table for several times and wipe

the outside of the dropper with a cloth.

(b) always keep the dropper bottle in a vertical position while dosing the reagent.

(a) (b)

STARTUP

Prepare the instrument for measurement as follows:

• Unpack the instrument by removing the dust protection sleeve from the instrument cuvette

holder.

• Place the battery in the instrument as described in the “BATTERY REPLACEMENT” chapter.

• Place the instrument on a flat table.

• Do not place the instrument under direct sun light.

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Hanna-instruments HI 96750 Manual do Utilizador Página 12