Hanna-instruments HI 83225 Manual de usuario descargar pdf (Pagina 10)

• In order to avoid reagent leaking and to obtain more accurate measurements,

close the cuvette first with the supplied HDPE plastic stopper and then the

black cap.

• Each time the cuvette is used, the cap must be tightened to the same degree.

• Whenever the cuvette is placed into the measurement cell, it must be dry

outside, and 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. For best

accuracy, respect the timings described in each specific method.

• 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 when possible (for most precise results follow the measurement procedures carefully).

• Discard the sample immediately after the reading is taken, or the glass might become permanently

stained.

• All the reaction times reported in this manual are at 25 °C (77 °F). In general, the reaction time

should be increased for temperatures lower than 20 °C (68 °F), and decreased for temperatures higher

than 25 °C (77 °F).

INTERFERENCES

• In the method measurement section the most common interferences that may be present in an average

sample matrix have been reported. It may be that for a particular treatment process other compounds

do interfere with the method of analysis.

• Pay attention to push the cuvette completely down in the holder and to align the white point on the

cap to the indexing mark on the meter.

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Hanna-instruments HI 83225 Manual de usuario Pagina 10