12
• 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 vial.
• 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 cuvet 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.
13
• Turn the meter on by pressing ON/OFF.
• When the LCD displays “701” or “711” it is
ready. The display code that appears is the last
selected parameter.
• Keep ZERO/SET pressed to change parameter.
The parameter code will change every three
seconds, until the key is released. Select the
program for free chlorine “701” or total chlorine
“711”.
• After the desired parameter code appears on
the display, perform either MEASUREMENT,
VALIDATION, or CALIBRATION PROCEDURE
following the instructions reported in the related
chapter.
Code
Parameter
701
Free Chlorine
711
Total Chlorine
or
OPERATIONAL GUIDE
