Hanna Instruments hi 93738 Manuel D’Utilisation

OPERATIONAL GUIDE

MEASUREMENT PROCEDURE

• Turn the meter on by pressing ON/OFF.

• When the LCD displays "- - -", it is

ready.

• Fill two graduated mixing cylinders (#1 & #2) up to

the 25 mL mark with the sample.

• Add 0.5 mL of HI 93738A chlorine dioxide reagent to

each cylinder (#1 & #2), close them and invert
several times to mix.

• Add the content of one packet of HI 93738B dechlori-

nating reagent to one only of the two cylinders (#1),
close it and invert several times to mix. This is the
blank.

• Add precisely 0.5 mL of HI 93738C chlorine dioxide

reagent to each cylinder (#1 & #2), close them and
invert several times to mix.

OFF

• Add 0.5 mL of HI 93738D chlorine dioxide reagent to

each cylinder (#1 & #2), close them and invert
several times to mix. Cylinder #2 is the sample.

• Fill a cuvet with 10 mL of the

blank (#1) up to 1.5 cm
(¾") below the rim and re-
place the cap.

• Place the blank (#1) into

the holder and ensure that
the notch on the cap is posi-
tioned securely into the groove.

• Press ZERO and "SIP"

will appear on the dis-
play.

• Wait for a few seconds and the

display will show "-0.0-". Now the
meter is zeroed and ready for mea-
surement.

• Fill a cuvet with 10 mL of the

reacted sample (#2) up to
1.5 cm (¾") below the rim
and replace the cap.

• Insert the sample into the

instrument.

• Press READ and "SIP"

will appear during
measurement.

• The instrument directly displays concentration in mg/L of

chlorine dioxide on the Liquid Crystal Display.

1.5 cm

ZERO

1.5 cm

The instruction listed below should be carefully followed.
• 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).

TIPS FOR AN ACCURATE

MEASUREMENT

SAMPLING PROCEDURE

It is recommended to analyze chlorine dioxide samples
immediately upon collection. Chlorine dioxide samples must
be stored in dark, glass stoppered bottles, with minimal
head space. Excessive heat (greater than 25°C/78°F), agi-
tation and exposure to light must be avoided.

INTERFERENCES

Interferences may be caused by strong oxidants.

BATTERY REPLACEMENT

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 cover.

Recommendations for Users
Before using these products, make sure that they are entirely suitable for the environ-
ment 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.

ACCESSORIES

REAGENT SETS

HI 93738-01 Reagents for 100 tests

HI 93738-03 Reagents for 300 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).

CE DECLARATION

OF CONFORMITY

IST93738R1

11/98

PRINTED IN PORTUGAL