Hanna Instruments HI 93734 - Manual (Page 2)

MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF.
• When the LCD displays "- - -", it is
ready.
• Select Free or Total
Chlorine by pressing
FREE/TOTAL. An "I"
or a "C" will appear
on the right corner
to indicate Free or Total Chlorine, respectively.
• Add to the cuvet 5 mL of
HI 93734B-0 Reagent B by means
of the 5 mL syringe.
Note: To measure exactly 5 mL of reagent with the
syringe, push the plunger completely into the syringe
and insert the tip into HI 93734B-0 reagent bottle.
Pull the plunger out until the lower edge of the seal is on
the 5 mL mark of the syringe.
• Fill the cuvet up to the 10 mL
mark with 5 mL of unreacted
sample, using the 3 mL plastic
pipette.
ON
OFF
FREE
TOTAL
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
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
unacceptable 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 microwave
ovens.
REAGENT SETS
HI 93734-01 Reagents for 100 Free & Total Chlorine tests
HI 93734-03 Reagents for 300 Free & Total Chlorine tests
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)
C 215-00300 5 mL graduated syringe
IST93734R3 07/04
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).
5 m L
p r o b a b l e l e v e l o f
l i q u i d t a k e n u p b y
s y r i n g e
5 m L
o f s a m p l e
1 0 m L
ZERO
• Press ZERO and "SIP" will blink 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.
• Only in case of Total Chlorine
measurement, add 3 drops of
HI 93734C-0 Reagent C to the
cuvet.
x 3
• Add the content of one packet
of HI 93701-0 Free Chlorine
Reagent to the cuvet. 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 in case of Free Chlorine or 2 minutes
and 30’’ seconds in case of Total Chlorine and then
press READ. The display will show “SIP” during
measurements.
• The instrument directly displays concentration in mg/L
(ppm) of Free or Total Chlorine on the Liquid Crystal
Display.
Note: Free and Total Chlorine have to be measured
separately with fresh unreacted samples following the
above procedure if both values are requested.
INTERFERENCES
Interference may be caused by:
Bromine, Iodine, Fluorine, Ozone, Oxidized Manganese and
Chromium.
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 1000 mg/L
CaCO
3
, shake the sample for approximately 1 minute after
adding the powder reagent.
ACCESSORIES
• 5 mL graduated syringe
• 1 plastic pipette
Operational Guide
Tips for an Accurate Measurement
CE Declaration of Conformity
Accessories
Note: rinse the 3 mL plastic pipette 2 or 3 times with
sample before adding it to the cuvet with reagent.
• Replace the cap and shake
gently.
• Place the cuvet into the holder
and ensure that the notch on
the cap is positioned securely
into the groove.