Справочник Пользователя для Hanna Instruments hi 93732

7

The instruction listed below should be carefully followed during testing
to ensure best accuracy.
• Do not let the test sample stand too long after reagent is added

or accuracy will be lost.

• Whenever the cuvet is placed into

the measurement cell, it must be
completely free of fingerprints, oil
or dirt. Wipe it thoroughly with
HI 93703-70 or a lint-free cloth
prior to insertion.

• It is important that the sample

does not contain any debris. This
would corrupt the readings.

• Each time the cuvet is used, the cap must be tightened to the

same degree.

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

recommended that a zero reading be taken for each sample and
that the same cuvet is used for zeroing and measurement.

• It is important to discard the sample immediately after the

reading is taken because the glass might become permanently
stained.

• 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 vial.

• 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).

10

• Let the sample stand and the flocculant agent will

start to settle.

• After approximately 2 minutes and when the

upper half of the bottle becomes limpid, add 10
drops of HI 93732C.

• Replace the cap and swirl the solution. The sample is ready for

measurement when it is yellow and completely limpid.

• Fill the cuvet up to 1.5 cm (¾”) below the rim with

10 mL of the unreacted (original) sample, and
replace the cap. This is the blank.

• Place the cuvet into the holder and

ensure that the notch on the cap is
positioned securely into the groove.

• Press ZERO and “SIP” will appear on the display.

• Wait for a few seconds and the display will

show “-0.0-”. Now the meter is zeroed and
ready for measurement.

• Remove the cuvet and dispose of the blank.
• Rinse the cuvet with some of the reacted

sample. Then, fill it up to 1.5 cm (¾”)
below the rim with 10 mL of the reacted
sample and replace the cap.

• Reinsert the cuvet into the instrument.

1.5 cm

ZERO