Hanna Instruments hi 93732 用户手册
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
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.
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.
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.
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.
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.
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).
at 10°C (50°F) and halved at 30°C (86°F).
TIPS FOR AN ACCURATE MEASUREMENT
TIPS FOR AN ACCURATE MEASUREMENT
TIPS FOR AN ACCURATE MEASUREMENT
TIPS FOR AN ACCURATE MEASUREMENT
TIPS FOR AN ACCURATE MEASUREMENT
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.
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.
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.
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.
ready for measurement.
• Remove the cuvet and dispose of the blank.
• Rinse the cuvet with some of the reacted
• 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.
below the rim with 10 mL of the reacted
sample and replace the cap.
• Reinsert the cuvet into the instrument.
1.5 cm
ZERO