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MEASUREMENT PROCEDURE
To compensate the meter for the sample turbidity or color, the measurement takes place in two
phases. First, the meter is zeroed using the unreacted sample. After the reagents are added the
reacted sample is measured.
Important note: Free and Total Chlorine have to be measured separately with fresh unreacted
samples if both values are requested.
• Turn the meter on by pressing ON/OFF.
The display briefly shows all tags on.
• When the beeper sounds briefly and the
LCD displays dashes, the meter is ready.
The blinking "ZERO" indicates that the
instrument needs to be zeroed first.
• Pay attention to the selected range.
To change the range, simply press
RANGE/GLP/ .
• Fill the cuvette with 10 mL of unreacted
sample, up to the mark, and replace the
cap.
• Place the cuvette into the cuvette holder
and ensure that the notch on the cap is
positioned securely into the groove.
• Press ZERO/CFM and the lamp, cuvette
and detector icons will appear on the
display, depending on the measurement
phase.
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• After a few seconds, the display will
show "-0.0-". The meter is now zeroed
and ready for measurement.
• Remove the cuvette.
• Add the content of one packet of the
specific test reagent, for:
Free Chlorine: 1 packet of HI 93701-0
or
Total Chlorine: 1 packet of HI 93711-0
• Replace the cap and shake gently for 20
seconds (or 2 minutes in case of seawater
analysis).
• Replace the cuvette into the cuvette holder
and ensure that the notch on the cap is
positioned securely into the groove.
• Press and hold READ/ /TIMER
for three
seconds.
The display will show the
countdown prior to measurement. An
audible "beep" indicates the end of
countdown period.
• Alternatively, wait for 1 minute for free
chlorine or 2'30'' for total chlorine and
just press READ/ /TIMER.
In both cases, the lamp, cuvette and
detector icons will appear on the display,
depending on the measurement phase.
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