Hanna Instruments HI 93734 User Manual

Instruction Manual

V

HI 93734

Free & Total Chlorine HR

ISM

www.hannainst.com

Warranty

HI 93734 is warranted for two years against defects in
workmanship and materials when used for its intended purpose and
maintained according to instructions.

This warranty is limited to repair or replacement free of charge.
Damages due to accident, misuse, tampering or lack of prescribed

maintenance are not covered.
If service is required, contact the dealer from whom you purchased

the instrument. If under warranty, report the model number, date of
purchase, serial number and the nature of the failure. If the repair
is not covered by the warranty, you will be notified of the charges
incurred. If the instrument is to be returned to Hanna Instruments,
first obtain a Returned Goods Authorization Number from the Customer
Service department and then send it with shipment costs prepaid.
When shipping any instrument, make sure it is properly packaged
for complete protection.

To validate your warranty, fill out and return the enclosed warranty
card within 14 days from the date of purchase.

All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner, Hanna
Instruments Inc., Woonsocket, Rhode Island, 02895, USA.

Hanna Instruments reserves the right to modify the design, con­struction and appearance of its products without advance notice.

Compliance with CE Directives

This Instrument is in

Dear Customer,
Thank you for choosing a Hanna product. This manual will

provide you with the necessary information for the correct
operation of the meter. Please read it carefully before using
the meter. If you need additional technical information, do
not hesitate to e-mail us at [e-mail].

This instrument is in compliance with directives.

Preliminary Examination

Remove the instrument from the packing material and exam­ine it carefully to make sure that no damage has occurred
during shipment. If there is any damage, notify your Dealer.

Each Ion Specific Meter is supplied complete with

• 9V Battery

• Two Sample Cuvets and Caps

• One Transport Cap

Note: Keep all packing material until the instrument has

been observed to function correctly. Any defective item
must be returned in its original packing.

General Description

The HI 93734 meter measures the Free and Total Chlorine
(Cl2) content in water and wastewater.

The meter uses an exclusive positive-locking system to en­sure that the cuvet is in the same position every time it is
placed into the measurement cell.

The reagents are in powder and liquid form and are supplied
in bottles and powder packets. The amount of reagent is
precisely dosed to ensure maximum repeatability.

Display codes aid the user in routine operations.
The meters have an auto-shut off feature that will turn the

instrument off after 10 minutes of non-use.

SPECIFICATIONS

Range Free Cl20.00 to 9.99 mg/L

Total Cl20.00 to 9.99 mg/L

Resolution 0.01 mg/L
Accuracy ±0.03 mg/L ±3% of reading
Typical EMC ±0.01 mg/L
Deviation
Light Source Light Emitting Diode @ 555 nm
Method Adaptation of the EPA recommended DPD

method 330.5. The reaction between
the chlorine and the DPD reagent causes
a pink tint in the sample

Light Detector Silicon Photocell
Environment 0 to 50°C (32 to 122°F);

max 95% RH non-condensing

Battery Type/Life 1 x 9 volt/40 hours
Auto-Shut off After 10' of non-use
Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8")
Weight 290 g (10 oz.).

REQUIRED REAGENTS

Code Description Quantity

HI 93701-0 Free Chlorine Reagent 1 packet
HI 93734B-0 Free & Total Chlorine 5 mL

Reagent B

HI 93734C-0 Total Chlorine Reagent C 3 drops

(for Total Chlorine only)

REAGENT SETS

HI 93734-01 Reagents for 100 Free & Total Chlorine tests
HI 93734-03 Reagents for 300 Free & Total Chlorine tests

Display Code GuideSpecifications

This indicates that the meter is in a ready
state and zeroing can be performed.

Sampling in Progress. This prompt appears
each time the meter is performing a
measurement.

This indicates that the meter is in a zeroed
state and measurement can be performed.

A zero reading was not taken. Insert a
sample before adding reagent and press
ZERO.

Under range. A blinking "0.00" indicates
that the sample absorbs less light than
the zero reference. Check the procedure
and make sure you use the same cuvet
for reference (zero) and measurement.

Over range. A flashing value higher than
the maximum concentration readable (see
specifications) indicates that the sample
absorbs too much light, meaning that the
concentration is too high. Dilute the
sample.

Light over range. The cuvet is not inserted
correctly and an excess ambient light is
reaching the detector. If the cover is
properly installed, then contact your dealer
or the nearest Hanna Customer Service
Center.

Light under range. The zero sample is too
dark for proper zeroing. If this is not the
case, contact your dealer or the nearest
Hanna Customer Service Center.

The "V" indicates that the battery voltage
is getting low and the battery needs to be
replaced.

This indicates that the battery is dead and
must be replaced.

Note: once this indication is displayed,
the meter will lockup. Change the battery
to restart.

ON

OFF

FREE

TOTAL

ZERO

Operational Guide

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.

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syringe

• Fill the cuvet up to the 10 mL
mark with 5 mL of unreacted
sample, using the 3 mL plastic
pipette.

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5mL

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10m

5mL

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.

• Press ZERO and "SIP" will blink on the display.

• 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

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).

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

Accessories

fade. To resolve this, neutralize the sample with diluted HCl

• 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.

or NaOH.
In case of water with hardness greater than 1000 mg/L
CaCO3, shake the sample for approximately 1 minute after
adding the powder reagent.

ACCESSORIES

x

3

• 5 mL graduated syringe

• 1 plastic pipette

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)

• 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).

Tips for an Accurate Measurement

The instruction listed below should be carefully followed
during testing to ensure best accuracy.

• Do not touch the cuvet walls with hands.

• Replace the cuvet into the
holder and ensure that the
notch on the cap is positioned
securely into the groove.

• 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.

• Wait for 1 minute in case of Free Chlorine or 2 minutes
and 30’’ seconds in case of Total Chlorine and then

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press READ. The display will show “SIP” during
measurements.

L

• 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

HI 731325 Caps for cuvets (4 pcs)
HI 93703-50 Cuvets cleaning solution (230 mL)
C 215-00300 5 mL graduated syringe

CE Declaration of Conformity

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.

IST93734R3 07/04