Instruction Manual
HI 93703
Portable Microprocessor
Turbidity Meter
This Instrument is in Compliance with the CE Directives
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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 all the neces-
sary information for the correct use of the
instrument, as well as a more precise idea of its
versatility in a wide range of applications.
This instrument is in compliance with the
directives.
TABLE OF CONTENTS
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... 15
Standard Suspension.......................... 16
Viewing the Calibration Date ............... 16
Battery Replacement ............................... 17
LCD and Error Codes ............................... 19
Accessories............................................. 21
Warranty .................................................. 22
CE Declaration of Conformity................... 23
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PRELIMINARY EXAMINATION
Remove the instrument from the packing material
and examine it to make sure that no damage has
occurred during shipping. If there is any damage,
notify your Dealer.
HI93703 is supplied complete with:
• 1.5V AA Size Batteries (4 ea.)
• Glass Cuvet
• Cap
Further to the above listed items, HI93703C is
a complete kit supplied with:
• Glass Cuvet
• Cap
• Cal. solutions HI93703-0 and HI93703-10
• Cleaning solution HI93703-50
• Cleaning tissue HI93703-70
• 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.
GENERAL DESCRIPTION
With HI 93703 turbidity measurements can be
performed with high precision in the field as well
as in the laboratory. HI93703 turbidity meter is
a hand-held, microprocessor-based, battery
operated instrument used to determine the
turbidity of water and waste-water. The meter
covers a 0-1000 FTU range in two scales: 0.00
to 50.00 FTU and 50 to 1000 FTU. The
autoranging feature of the instrument sets the
appropriate range for the measurement.
Note: HI 93703 has been designed
according to the ISO 7027
International Standard, consequently
the turbidity measurement unit is the
FTU (Formazine Turbidity Unit). FTU
is identical to the other internationally
recognized unit: NTU (Nephelometric
Turbidity Unit).
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HI 93703 is a portable turbidity meter with the
mark, in compliance with the European
directives, ensuring low emission values and
accurate measurements in presence of
electromagnetic fields.
The meter is housed in 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.
The meter is very simple to use. All operations
can be carried out with only four keys and
trouble-shooting functions can be performed
with displayed error code guides. An exclusive
positive-locking system guarantees that the
cuvet 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 measurements in different applications, from drinking water 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, and
cannot be reused because of their short life.
Hanna Instruments standards are extremely
stable, can be reused, and last up to six
months, if free from contamination. HI 93703
can be used with both standards.
* 1 FTU = 1 NTU
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PRINCIPLE OF OPERATION
HI 93703 has been designed to perform mea-
surements 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.
LIGHT
DETECTOR
IR LED
EMITTED LIGHT (890 nm)
90° SCATTERED
CUVET
LIGHT
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:
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
5
* 1 FTU = 1 NTU
FUNCTIONAL DESCRIPTION
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2
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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, to perform measurements
and to set the date (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
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SPECIFICATIONS
HI93703
Range 0.00 to 50.00 FTU *
50 to 1000 FTU *
Resolution 0.01 and 1 FTU *
Accuracy ±0.5 FTU* or ±5%
of reading (whichever greater)
EMC Typical ±2% Full Scale
Deviation
Light Source High Emission Infrared LED
Light Source Life Life of the instrument
Light Detector Silicon Photocell
Power Source 4 x 1.5V AA batteries
Battery Life 60 hours or 900 measurements
Auto-Shut off After 5 minutes
Operating 0 to 50
Conditions 0 to 95% RH (non-condensing)
Dimensions 220 x 82 x 66 mm
Weight 510 g (18 oz.)
°
C (32 to 122°F);
(8.7 x 3.2 x 2.6")
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* 1 FTU = 1 NTU
OPERATIONAL GUIDE
To prepare the instrument for taking
measurements, first install the batteries (see
Battery Replacement section on page 17) and
then turn the instrument on.
To maximize 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. After the test,
the LCD will change
to the measurement mode.
• When the LCD displays “----” the meter
is ready to measure.
• Fill a clean cuvet 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.
Note: do not overtighten the cap.
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