MEASUREMENT PROCEDURE
• Turn the meter on by pressing
ON/OFF.
• When the LCD displays “- - -”, it
is ready.
• Fill the cuvet with 10 mL of
unreacted sample, up to the
mark, and replace the cap.
• 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.
Powder reagent procedure
• Add the content of one packet of
HI 93701 DPD reagent. Replace
the cap and shake gently for 20
seconds (or 2 minutes in case of
seawater analysis).
• Replace the cuvet into the holder
and ensure that the notch on
the cap is positioned securely
into the groove.
• Wait for 1 minute and press READ DIRECT. The display
will show “SIP” during measurements.
ON
OFF
ZERO
• The instrument directly displays concentration in mg/L of
free chlorine on the Liquid Crystal Display.
Liquid reagents procedure
• To an empty cuvet add
3 drops of HI 93701A-F
DPD1 indicator, 3 drops
of HI 93701B-F DPD1
buffer. Swirl gently to
mix and immediately add
10 mL of unreacted
sample.
• Replace the cap and
shake gently again.
• Reinsert the cuvet into
the instrument.
• Wait for 1 minute and then press READ DIRECT. The
display will show “SIP” during measurements.
• The instrument directly displays concentration in mg/L of
free chlorine on the Liquid Crystal Display.
INTERFERENCES
Interference may be caused by:
Bromine
Iodine
Chlorine dioxide
Ozone
Hydrogen peroxide
Oxidized Chromium (Cr
6+
) and Manganese (Mn
4+
, Mn
7+
).
Alkalinity above 250 mg/L or acidity above 150 mg/L will
not reliably develop the full amount of color or it may
rapidly fade. To resolve this, neutralize the sample with
diluted HCl or NaOH.
In case of water with hardness greater than 500 mg/L
CaCO
3
, shake the sample for approximately 1 minute after
adding the powder reagent.
The instruction listed below should be carefully followed
during testing to ensure best accuracy.
• Do not touch the cuvet walls with hands.
• In order to maintain the same conditions during the
zeroing and the measuring phases, it is necessary to
close the cuvet to prevent any contamination.
• 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 731318
or a lint-free cloth
prior to insertion.
• It is important that the sample does not contain any
debris. This would corrupt the readings.
• 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 measure-
ments, 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).
Recommendations for Users
Before using these products, make sure that they are entirely suitable for
the environment in which they are used.
Operation of these instruments in residential area could cause unaccept-
able interferences to radio and TV equipments, requiring the operator to
take all necessary steps to correct interferences.
Any variation introduced by the user to the supplied equipment may
degrade the instruments' EMC performance.
To avoid damages or burns, do not perform any measurement in micro-
wave ovens.
REAGENT SETS
HI 93701-F
Reagents for 300 tests (liquid)
HI 93701-01
Reagents for 100 tests (powder)
HI 93701-03
Reagents for 300 tests (powder)
OTHER ACCESSORIES
HI 710009
Blue rubber boot
HI 710010
Orange rubber boot
HI 721310
9V battery (10 pcs)
HI 731318
Tissue for wiping cuvets (4 pcs)
HI 731321
Glass cuvets (4 pcs)
HI 731325
Caps for cuvets (4 pcs)
HI 93703-50
Cuvets cleaning solution (230 mL)
IST93701R4 09/03
10 mL
Battery replacement must only take place in a non-hazard-
ous area using a 9V alkaline battery.
Simply slide off the battery cover on the back of the meter.
Detach the battery from the terminals and attach a fresh
9V battery while paying attention to the correct polarity.
Replace the battery and the cover.
9V
SLIDE
OFF
READ
DIRECT
READ
DIRECT
Operational Guide
Tips for an Accurate Measurement
Battery Replacement
CE Declaration of Conformity
Accessories