Hanna Instruments HI 96734C User manual

INSTRUCTION MANUAL
HI96734C
Free and Total Chlorine High
Range ISM

Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before using the instrument.
This manual will provide you with the necessary information for correct use of
the instrument, as well as a precise idea of its versatility.
If you need additional technical information, do not hesitate to e‑mail us at
[email protected] or view our worldwide contact list at www.hannainst.com.
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.
Dear
Customer,

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PRELIMINARY EXAMINATION ............................................................................................
GENERAL DESCRIPTION ....................................................................................................
ABBREVIATIONS ..............................................................................................................
SPECIFICATIONS ..............................................................................................................
PRECISION AND ACCURACY ..............................................................................................
PRINCIPLE OF OPERATION ...............................................................................................
FUNCTIONAL DESCRIPTION ...............................................................................................
ERRORS AND WARNINGS .................................................................................................
GENERAL TIPS FOR AN ACCURATE MEASUREMENT .............................................................
STARTUP ........................................................................................................................
RANGE SELECTION............................................................................................................
MEASUREMENT PROCEDURE ............................................................................................
VALIDATION PROCEDURE .................................................................................................
CALIBRATION PROCEDURE ...............................................................................................
GLP ................................................................................................................................
BATTERY MANAGEMENT ...................................................................................................
BATTERY REPLACEMENT ...................................................................................................
ACCESSORIES ..................................................................................................................
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TABLE OF CONTENTS
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Please examine this product carefully. Make sure that the instrument is not damaged. If any damage
occurred during shipment, please contact your local Hanna Instruments Office.
Each HI96734 Ion Selective Meter is supplied complete with:
• Sample Cuvettes and Caps (2 pcs.)
• CAL CheckTM Standard Cuvettes
• 9V Battery
• Scissors
• Cloth for wiping cuvettes
• Instruction Manual and Quick Reference Guide
• Instrument Quality Certificate
• Rigid carrying case
Note: Save all packing material until you are sure that the instrument works correctly. Any
defective item must be returned in its original packing.
PRELIMINARY EXAMINATION
heckTM
heckTM

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The HI96734 is an auto diagnostic portable microprocessor meter that benefits from Hanna
Instruments’ years of experience as a manufacturer of analytical instruments. It has the advanced
optical system based on a special tungsten lamp and a narrow band interference filter that allows
most accurate and repeatable readings. All instruments are factory calibrated and the electronic
and optical design minimizes the need of frequent calibration.
With the powerful CAL CheckTM validation function, you are able to validate good performance
of your instrument at any time. The validation procedure is extremely user friendly. Just use the
exclusive Hanna Instruments ready‑made, NIST traceable standards to verify the performance of
the instrument and recalibrate if necessary.
All instruments are splash proof and the lamp and filter units are protected from dust or dirt by
a transparent cup. This makes the instruments fulfill field applications. Display messages aid the
user in routine operation. The meter has an auto‑shut off feature that will turn off the instrument
after 10 minutes of non use in measurement mode or after 1 hour if left in calibration mode.
The meter uses an exclusive positive‑locking system to ensure that the cuvette is in the same
position every time it is placed into the measurement cell. It is designed to fit a cuvette with a
larger neck making it easier to add both sample and reagents. The cuvette is made from special
optical glass to obtain best results.
The HI96734 meter measures the free and total chlorine (Cl2) content in water samples in the
0.00 to 10.00 mg/L (ppm) range. The method is an adaptation of the USEPA Method 330.5 for
wastewater, and Standard Method 4500‑Cl G for drinking water.
The reagents are in powder and liquid form and are supplied in packets and bottles. The amount
of reagent is precisely dosed to ensure the maximum repeatability.
degree Celsius
US Environmental Protection Agency
degree Fahrenheit
milligrams per liter. mg/L is equivalent to ppm (parts per million)
milliliter
millivolt
°C:
EPA:
°F:
mg/L:
mL:
mV:
GENERAL DESCRIPTION ABBREVIATIONS

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SPECIFICATIONS
Range Free Cl2 0.00 to 10.00 mg/L
Total Cl2 0.00 to 10.00 mg/L
Resolution 0.01 mg/L (0.00‑3.50 mg/L)
0.10 mg/L (above 3.50 mg/L)
Accuracy
@25 °C (77 °F) ±0.03 mg/L ±3% of reading
Light Source Tungsten lamp
Light Detector Silicon Photocell with narrow band interference filter @525nm
Method
Adaptation of the USEPA method 330.5 and Standard Method
4500‑Cl G. The reaction between chlorine and the DPD reagent causes
a pink tint in the sample.
Environment 0 to 50 °C (32 to 122 °F);
max 95% RH non‑condensing
Battery Type 9V (1 pc.)
Auto‑Shut off
After 10’ of non‑use in measurement mode;
after 1 hour of non‑use in calibration mode;
with last reading reminder.
Dimensions 192 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
Weight 320 g (11.3 oz.)
Required Reagents
Code Description Quantity/test
HI93701‑0 DPD Powder Reagent 1 packet
HI93734B‑0 Free and Total Chlorine Reagent 5 mL
HI93734C‑0 Total Chlorine Reagent 3 drops

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Precision is how closely repeated measurements
agree with each other. Precision is usually expressed
as standard deviation (SD).
Accuracy is defined as the nearness of a test result
to the true value.
Although good precision suggests good accuracy,
precise results can be inaccurate. The figure explains
these definitions.
In a laboratory using a standard solution of
3.00 mg/L chlorine and a representative lot
of reagent, an operator obtained with a single
instrument a standard deviation of 0.06 mg/L.
PRECISION AND ACCURACY PRINCIPLE OF OPERATION
Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and
matter. When a light beam crosses a substance, some of the radiation may be absorbed by atoms,
molecules or crystal lattices.
If pure absorption occurs, the fraction of light absorbed depends both on the optical path length
through the matter and on the physical‑chemical characteristics of the substance according to the
Lambert‑Beer Law:
‑log I/Io= ελc d
or
A = ελc d
Where:
‑log I/Io = Absorbance (A)
Io = intensity of incident light beam
I = intensity of light beam after absorption
ε
λ= molar extinction coefficient at wavelength λ
c = molar concentration of the substance
d = optical path through the substance

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Therefore, the concentration “c” can be calculated from the absorbance of the substance as the
other factors are known.
Photometric chemical analysis is based on the possibility to develop an absorbing compound from a
specific chemical reaction between sample and reagents. Given that the absorption of a compound
strictly depends on the wavelength of the incident light beam, a narrow spectral bandwidth should
be selected as well as a proper central wavelength to optimize measurements.
The optical system of Hanna Instruments’ HI96 series colorimeters is based on special subminiature
tungsten lamps and narrow‑band interference filters to guarantee both high performance and
reliable results.
HI96 series block diagram (optical layout)
A microprocessor controlled special tungsten lamp emits radiation which is first optically conditioned
and beamed to the sample contained in the cuvette. The optical path is fixed by the diameter of
the cuvette. Then the light is spectrally filtered to a narrow spectral bandwidth, to obtain a light
beam of intensity Ioor I.The photoelectric cell collects the radiation Ithat is not absorbed by
the sample and converts it into an electric current, producing a potential in the mV range.
The microprocessor uses this potential to convert the incoming value into the desired measuring
unit and to display it on the LCD.
The measurement process is carried out in two phases: first the meter is zeroed and then the actual
measurement is performed.
The cuvette has a very important role because it is an optical element and thus requires particular
attention. It is important that both, the measurement and the calibration (zeroing) cuvettes, are
optically identical to provide the same measurement conditions. Whenever possible use the same
cuvette for both. It is necessary that the surface of the cuvette is clean and not scratched. This to avoid
measurement interference due to unwanted reflection and absorption of light. It is recommended
not to touch the cuvette walls with hands.
Furthermore, in order to maintain the same conditions during the zeroing and the measuring phases,
it is necessary to close the cuvette to prevent any contamination.
PRINCIPLE OF OPERATION

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INSTRUMENT DESCRIPTION
1) RANGE/GLP key
2) CAL CHECK key
3) ZERO/CFM key
4) READ /TIMER key
5) ON/OFF key
6) Liquid Crystal Display (LCD)
7) Cuvette alignment indicator
8) Cuvette holder
KEYPAD DESCRIPTION
• ON/OFF: to turn the meter on and off.
• ZERO/CFM: this is a bi‑functional key. Just press to zero the meter prior to measurement, or
confirm edited values. In calibration mode press to confirm factory calibration restore.
• READ /TIMER: this is a multi‑functional key. In measurement mode, press to make a
measurement, or press and hold for three seconds to start a pre‑programmed countdown prior
to measurement. In GLP mode press to view the next screen.
• CAL CHECK: this is a bi‑functional key. Just press to perform the validation of the meter, or
press and hold for three seconds to enter calibration mode.
•RANGE/GLP : this is a multi‑functional key. Just press to change the parameter. Press and
hold for three seconds to enter GLP mode. In calibration mode press to edit the date and time.
FUNCTIONAL DESCRIPTION

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OPERATING MODES
• Measurement mode:default operation mode, enables both validation and measurement.
• Calibration mode: may be entered by keeping CAL CHECK pressed for three seconds
(the “CAL” tag appears), it enables calibration of the instrument.
• GLP mode may be entered by keeping RANGE/GLP pressed for three seconds (“GLP”
appears), it enables consulting of user calibration date or restore factory calibration.
FUNCTIONAL DESCRIPTION
1) The measuring scheme (lamp, cuvette, detector), appears during different phases of zero or
reading measurement
2) Error messages and warnings
3) The battery icon indicates the charge state of the battery
4) The hourglass appears when an internal check is in progress
5) Status messages
6) The chronometer appears when the reaction timer is running
7) The month, day and date icons appear when a date is displayed
8) Four digit main display
9) Measuring units
10) Four digit secondary display
DISPLAY ELEMENTS DESCRIPTION

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The instrument shows clear messages when erroneous condition appears. Messages are also displayed
when the obtained values are outside expected range. The beeper is playing a beep on errors.
a) on zero reading
Light High: There is too much light to perform a measurement.
Please check the preparation of the zero cuvette.
Light Low: There is not enough light to perform a measurement.
Please check the preparation of the zero cuvette.
No Light: The instrument cannot adjust the light level. Please check
that the sample does not contain any debris.
ERRORS AND WARNINGS
Inverted cuvettes: The sample and the zero cuvette are inverted.
Zero: A zero reading was not taken. Follow the instructions of the
measurement procedure for zeroing the meter.
b) on sample reading

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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 cuvette for reference (zero) and measurement.
ERRORS AND WARNINGS
Over Range: A flashing value of the maximum concentration
indicates an over range condition. The concentration of the sample
is beyond the programmed range: dilute the sample and re‑run
the test.
c) during calibration procedure
Standard Low: The standard reading is less than expected.
Standard High: The standard reading is higher than expected.
Cap error: Appears when external light enters in the analysis cell.
Assure that the cuvette cap is present.
d) other errors and warnings

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Cooling lamp: The instrument waits for the lamp to cool down.
Battery low: The battery must be replaced soon.
ERRORS AND WARNINGS
Dead battery: This indicates that the battery is dead and must
be replaced. Once this indication is displayed, normal operation of
the instrument will be interrupted. Change the battery and restart
the meter.

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GENERAL TIPS FOR AN ACCURATE MEASUREMENT
The instructions listed below should be carefully followed during testing to ensure best accuracy.
• Color or suspended matter in large amounts may cause interference, therefore these should be
removed by treatment with active carbon and by prior filtration.
• For a correct filling of the cuvette: the liquid in the cuvette forms a concavity on the top; the
bottom of this concavity must be at the same level of the 10 mL mark.
• It is important that the sample does not contain any debris. This would corrupt the reading.
• Each time the cuvette is used, the cap must be tightened to the same degree.
• Whenever the cuvette is placed into the measurement cell, it must be dry outside, and completely
free of fingerprints, oil or dirt. Wipe it thoroughly with HI731318 or a lint‑free cloth prior to
insertion.
• Proper use of dropper:
(a) to get good reproducible results, tap the dropper on the table for several times and wipe
the outside of the dropper with a cloth.
(b) always keep the dropper bottle in a vertical position while dosing the reagent.
HI93734C-0
HI93734C-0

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• In order to measure exactly 5 mL of reagent with the 5 mL syringe:
(a) push the plunger completely into the syringe and insert the tip into the reagent bottle.
(b) pull the plunger up until the lower edge of the seal is exactly on the 5 mL mark.
(c) take out the syringe and clean the outside of the syringe tip. Be sure that no drops are
hanging on the tip of the syringe, if so eliminate them. Then, keeping the syringe in
vertical position above the cuvette, push the plunger completely down into the syringe. Now
the exact amount of 5 mL has been added to the cuvette.
• Proper use of the powder reagent packet:
(a) use scissors to open the powder packet;
(b) push the edges of the packet to form a spout;
(c) pour out the content of the packet.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
HI93701-0
HI93701-0
HI93701-0

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• Shaking the cuvette can generate bubbles in the sample, causing higher readings. To obtain
accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.
• Do not let the reacted sample stand too long after reagent is added, or accuracy will be lost.
• It is possible to take multiple readings in a row, but it is recommended to take a new zero
reading for each sample and to use the same cuvette for zeroing and measurement.
• After the reading it is important to discard immediately the sample, otherwise the glass might
become permanently stained.
• All the reaction times reported in this manual are referred to 25 °C (77 °F). In general, the
reaction time should be increased for temperatures lower than 20 ºC (68 ºF), and decreased
for temperatures higher than 25 ºC (77 ºF).
• In order to maximize accuracy, prior to a measurement follow the validation procedure to be
sure that the instrument is properly calibrated. If necessary, calibrate the instrument.
Prepare the instrument for measurement as follows:
• Unpack the instrument by removing the dust protection sleeve from the instrument cuvette holder.
• Place the battery in the instrument as described in the “BATTERY REPLACEMENT” chapter.
• Place the instrument on a flat table.
• Do not place the instrument under direct sun light.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
STARTUP

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• Press RANGE/GLP to change the range.
The range can be changed any time when the instrument is in measurement mode.
The selected range is memorized and the selection remaines unchanged at power off or when the
battery is removed.
The HI96734 can measure Free chlorine when range P1 is selected or Total chlorine when range
P2 is selected. To change the active range follow the procedure:
• Turn the meter on by pressing ON/OFF. The display briefly shows all tags on.
• After startup, the range identification number is displayed on the secondary LCD as P1 or P2.
RANGE SELECTION
Code Parameter
P1 Free Chlorine
P2 Total Chlorine

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MEASUREMENT PROCEDURE
• Turn the meter on by pressing ON/OFF. The display briefly shows all tags on.
• When the beeper sounds briefly and the LCD displays dashes, the meter is ready. The blinking
“ZERO” indicates that the instrument needs to be zeroed first.
To compensate the meter for the sample turbidity or color, the measurement takes place in two
phases. First, the meter is zeroed using the unreacted sample. After the reagents are added the
reacted sample is measured.
Important note: Free and Total Chlorine have to be measured separately with fresh unreacted
samples if both values are requested.
• Pay attention to the selected range. To change the range, simply press RANGE/GLP .
• Add to the cuvette 5 mL of HI93734B‑0 reagent by means of the 5 mL syringe.
Note: In order to measure exactly 5 mL of reagent with the syringe follow the instructions
on page 15.

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• Fill the cuvette up to the 10 mL mark with 5 mL of unreacted sample, using the 3 mL plastic
pipette.
Note: Rinse the 3 mL plastic pipette several times with sample before adding it to the cuvette.
• Replace the cap and shake gently for some seconds.
• Place the cuvette into the cuvette holder and ensure that the notch on the cap is positioned
securely into the groove.
• Press ZERO/CFM and the lamp, cuvette and detector icons will appear on the display, depending
on the measurement phase.
MEASUREMENT PROCEDURE

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MEASUREMENT PROCEDURE
• After a few seconds, the display will show “-0.0-”. The meter is now zeroed and ready for
measurement.
• Remove the cuvette.
• Only in case of total chlorine measurement, add 3 drops of HI93734C‑0 reagent to the cuvette.
• For both free and total chlorine, add the content of one packet of HI93701‑0 Free Chlorine
reagent. Replace the cap and shake gently for 20 seconds.
• Replace the cuvette into the cuvette holder and ensure that the notch on the cap is positioned
securely into the groove.
HI93734C-0
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HI93701-0