Hanna Instruments HI 93711 User Manual

Instruction Manual

HI 93711

Free & Total Chlorine

ISM

www.hannainst.com

WARRANTY

HI 93711 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.

This Instrument is in

Compliance with the CE Directives

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: Conserve 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 93711 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 place every time it is placed
into the measurement cell.

The reagents are in liquid and powder form and are
supplied in bottles and in 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

SPECIFICATIONS

Range Free Cl20.00 to 2.50 mg/L

Total Cl20.00 to 3.50 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 80 x 83 x 46 mm (7.1 x 3.3 x 1.8")
Weight 290 g (10 oz.).

REQUIRED REAGENTS

POWDER:

Code Unit Description Quantity

HI 93701-0 Free Cl
HI 93711-0 Total Cl

2

2

LIQUID:

Code Unit Description Quantity

HI 93701A-T Free and Total Cl2DPD1 indicator 3 drops
HI 93701B-T Free and Total Cl2DPD1 buffer 3 drops
HI 93701C Total Cl2 only DPD3 solution 1 drop

DPD 1 packet
DPD 1 packet

DISPLAY CODE GUIDE

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.

V

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.

OPERATIONAL GUIDE

L

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.

FREE

TOTA

• 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.

ZERO

• 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 reagents procedure

• Add the specific test reagent to the cuvet:

Free Chlorine: 1 packet of Total Chlorine: 1 packet of
DPD Free Chlorine reagent DPD Total Chlorine reagent.

10 mL

ON

OFF

• 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.

or

• The instrument directly displays concentration in mg/L of
Free or Total Chlorine on the Liquid Crystal Display.

Liquid reagents procedure

• To an empty cuvet add
3 drops of HI 93701A-T
DPD1 indicator, 3 drops

x 3x 3 x 1

of HI 93701B-T DPD1 buffer
and only in case of Total
Chlorine measurement add
also 1 drop of HI 93701C
DPD solution. 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 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.

or

• The instrument directly displays concentration in mg/L 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 500 mg/L
CaCO3, shake the sample for approximately 1 minute after
adding the powder reagent.

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.

• 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 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).

ACCESSORIES

REAGENT SETS

HI 93701-01 Reagents for 100 free chlorine tests (powder)
HI 93701-03 Reagents for 300 free chlorine tests (powder)
HI 93711-01 Reagents for 100 total chlorine tests (powder)
HI 93711-03 Reagents for 300 total chlorine tests (powder)

HI 93701-T Reagents for 300 chlorine tests (liquid)

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

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.

IST93711R4 09/03