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The instructions listed below should be carefully followed during testing to ensure best accuracy.
• For a correct filling of the cuvet: the liquid in the cuvet forms
a concavity on the top; the bottom of this concavity must be
at the same level of the 10 mL mark.
• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
• It is important that the sample does not contain any debris. This would corrupt the reading.
• Each time the cuvet is used, the cap must be tightened to the same degree.
• Whenever the cuvet 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 cuvet can generate bubbles in the sample, causing higher
readings. To obtain accurate measurements, remove such bubbles by
swirling or by gently tapping the cuvet.
• 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 cuvet for zeroing and measurement.
• 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.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT