Hanna Instruments HI 93703 User manual

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Instruction Manual
HI 93703
Portable Microprocessor
Turbidity Meter
www.hannainst.com

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PRELIMINARY EXAMINATION .............................................. 3
GENERAL DESCRIPTION...................................................... 3
PRINCIPLE OF OPERATION ................................................. 5
FUNCTIONAL DESCRIPTION ................................................ 6
SPECIFICATIONS ............................................................... 7
OPERATIONAL GUIDE ......................................................... 8
MEASUREMENT PROCEDURE ............................................... 8
HOW TO ENSURE ACCURATE MEASUREMENTS .................... 11
SOURCES OF INTERFERENCES ............................................ 12
CALIBRATION .................................................................. 13
CALIBRATION PROCEDURE ................................................. 13
HOW TO ENSURE ACCURATE CALIBRATION .......................... 17
STANDARD SUSPENSION................................................... 18
VIEWING THE CALIBRATION DATE ....................................... 18
BATTERY REPLACEMENT ................................................... 19
LCD AND ERROR MESSAGES ............................................. 21
ACCESSORIES ................................................................. 23
WARRANTY ..................................................................... 23
Dear Customer,
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 it’s 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.
TABLE OF CONTENTS

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WithHI93703turbidity measurements canbe performedwithhigh
precision in the field as well as in the laboratory.
HI 93703 turbidity meter is a portable, microprocessor-based
instrumentusedtodeterminetheturbidityofwaterandwastewater.
The meter covers a 0 to 1000 FTU range in two scales: 0.00 to
50.00 FTU and 50 to 1000 FTU. The auto-ranging feature sets the
appropriate range for the measurement.
HI 93703 has been designed according to the ISO7027
International Standard, consequently the turbidity unit is
the FTU (Formazine Turbidity Unit). FTU is equivalent to
the other internationally recognized unit: NTU
(Nephelometric Turbidity Unit).
Remove the instrument from the packing material and examine it
tomake sure that no damage has occurred during shipping. Ifthere
is any damage, notify your dealer or the nearest Hanna Costumer
Service Center.
HI 93703 is supplied complete with:
• Glass cuvette with cap
• Batteries (4 x 1.5V AA) and instructions
HI 93703C is a complete kit supplied with:
• 2 glass cuvettes with caps
• Batteries (4 x 1.5V AA) and instructions
•HI 93703-0, HI 93703-10 and HI 93703-05 calibration
standards
• Tissue for wiping cuvettes
• Rugged carrying case
Note: Save all packing material until you are sure that the
meter functions correctly. All defective items must be
returned in its original packaging with the supplied
accessories.
PRELIMINARY EXAMINATION
GENERAL DESCRIPTION

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* 1 FTU = 1 NTU
The meter housing is a rugged and lightweight case, with an
easy-to-read LCD.
To save battery-life, the instrument is equipped with an automatic
shut-off feature which is activated after 4 minutes of non-use.
Themeterisverysimpletouse:alloperationscanbecarriedoutwith
onlyfour keys andtroubleshootingfunctionscan be performedwith
displayed error code guides.
An exclusive positive-locking system guarantees that the cuvette is
firmly placed in the cell. The keypad is water-resistant and can be
wiped with a moist cloth for quick cleanups.
The one-point calibration at 10 FTU* can be easily performed
using the available standard. In addition, HI 93703 is the first
portable turbidity meter that allows to store the last calibration
date and to retrieve it at the user’s convenience.
HANNA instruments has chosen 10 FTU * as the calibration
point because it is the value that best fits the water turbidity
measurementsindifferentapplications,fromdrinkingwater
to wastewater treatment.
HANNA instruments uses the primary standard AMCO-AEPA-1 to
avoid all formazine-related problems. Formazine is a very toxic,
unstable substance, which requires particular care: its standards
have to be prepared only a few minutes before performing the
calibration,andcannotbereused because of their short life. Hanna
Instrumentsstandardsare extremelystable,canbereused,andlast
up to six months, if free from contamination.
HI 93703 can be used with both standards.

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* 1 FTU = 1 NTU
HI 93703 has been designed to perform measurements according
to the ISO 7027 International Standard.
The instrument functions by passing a beam of infrared light
through a vial containing the sample being measured.
The light source is a High Emission Infrared LED with a wavelength
peaking at 890 nm, ensuring that the interference caused by
colored samples is minimum.
A sensor, positioned at 90° with respect to the direction of light,
detects the amount of light scattered by the undissolved particles
present in the sample. The microprocessor converts such readings
into FTU* values.
As noted above, FTU unit is equal to the NTU unit. However, there
are other known measurement units for turbidity: Jackson Turbidity
Unit (JTU) based on the old method of Jackson's candle, and Silica
Unit (mg/L of SiO2). For your reference the conversion table
between these measurement units is shown below:
PRINCIPLE OF OPERATION
JTU FTU/NTU SiO2 (mg/L)
JTU 1 19 2.5
FTU/NTU 0.053 1 0.13
SiO2 (mg/L) 0.4 7.5 1

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1) Measurement cell
2) LCD (Liquid Crystal Display)
3) ON/OFF key
4) CAL key, to enter the calibration mode
5) READ/key,toperformmeasurementsandtosetthedate
(day and month) of the last calibration
6) DATE/key, to display the last calibration date and to
select either the month or the day of last calibration
FUNCTIONAL DESCRIPTION

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* 1 FTU = 1 NTU
SPECIFICATIONS
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Topreparetheinstrumentfortakingmeasurements,firstinstallthe
batteries (see Battery Replacement section on page 17) and then
turn the instrument on.
To maximize the battery life the meter is automatically switched
off after 5 minutes of non-use. To reactivate it, simply press the
ON/OFF key.
MEASUREMENT PROCEDURE
• Turn the meter on by pressing the
ON/OFF key.
• The meter will carry out a self-test
displaying a full set of figures.
Afterthetest,the LCDwillchange
to the measurement mode.
• When the LCD displays “----”
the meter is ready to measure.
• Fill a clean cuvette up to one
quarter inch (0.5 cm) from
its rim with the thoroughly
agitated sample.
• Allow sufficient time for bubbles to escape before securing the
cap.
OPERATIONAL GUIDE

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• Wipethecuvettethoroughlywith
a lint-free tissue (HI 93703-70)
before inserting into the
measurement cell. The cuvette
must be completely free of
fingerprints and other oil or
dirt, particularly in the area
where the light goes through
(approximately the bottom
2 cm/1 inch of the cuvette).
• Place the cuvette into the cell
andcheckthatthenotchon the
cap is positioned securely into
the groove.
• The mark on the cuvette cap
should point towards the LCD.
• Press the READ/key and
the LCD will display a blinking
“SIP” (Sampling in Process).
The turbidity value will appear
afterapproximately25seconds.

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* 1 FTU = 1 NTU
• Even though HI 93703 covers a very wide range of turbidity
values, for very accurate measurements of samples exceeding
40 FTU*, Standard Methods require dilution. In such cases,
the correct amount of HI 93703-0 or turbidity-free water to
be added to the sample can be calculated as follows:
Vos = 3000 / T
where: Vos= volume of sample (mL) to be combined with
HI93703-0 toobtainthe final volumeof100 mL.
T=HI 93703 reading (exceeding 40 FTU*)
E.g.: HI 93703 reading = 200 FTU *
3000 / 200 = 15 mL (Vos)
15 mL (Vos)+85 mL (HI 93703-0) = 100 mL
At this point, take a sample of this solution and measure turbidity.
The correct turbidity value of the original sample will be:
Tnx 100 mL / Vos = Ta
where: Tn= new HI 93703 reading
Ta= actual turbidity value of the original sample
E.g. If Tn= 27 FTU *
Ta= 27 FTU *x100 mL / 15 mL = 180 FTU *