Hanna Instruments | HI93703 | Owner Manual | Hanna Instruments HI93703 Owner Manual

Hanna Instruments HI93703 Owner Manual
Instruction Manual
HI 93703
Portable Microprocessor
Turbidity Meter
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 tech@hannainst.com or view our worldwide contact list at
PRELIMINARY EXAMINATION .............................................. 3
GENERAL DESCRIPTION...................................................... 3
PRINCIPLE OF OPERATION ................................................. 5
FUNCTIONAL DESCRIPTION ................................................ 6
SPECIFICATIONS ............................................................... 7
OPERATIONAL GUIDE ......................................................... 8
MEASUREMENT PROCEDURE ............................................... 8
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
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 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
• 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
With HI 93703 turbidity measurements can be performed with high
precision in the field as well as in the laboratory.
HI 93703 turbidity meter is a portable, microprocessor-based
instrument used to determine the turbidity of water and wastewater.
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).
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.
The meter is very simple to use: all operations can be carried out with
only four keys and troubleshooting functions can be performed with
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
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
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:
SiO2 (mg/L)
SiO2 (mg/L)
* 1 FTU = 1 NTU
Measurement cell
LCD (Liquid Crystal Display)
ON/OFF key
CAL key, to enter the calibration mode
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
0.00 to 50.00 FTU*
50 to 1000 FU*
0.01 FTU*
Resolut ion
1 FTU*
±0.5 FTU* or ±5% of reading
(whichever is greater)
Calibrat ion
3 point (0, 10 and 500 FTU*)
Light Source
Infrared LE D
Light Source Life
Life of the instrument
Light Det ect or
Silicon Photocell
Bat t ery Type
4 x 1.5V AA alkaline
Approx. 60 hours of use or
Bat t ery Life
900 measurements
Aut o-off
After 5 minutes of non-use
0 to 50 ºC (32 to 122 ºF);
RH max. 95% non-condensing
220 x 82 x 66 mm
(8.7 x 3.2 x 2.6 ")
510 g (1.1 lb.)
* 1 FTU = 1 NTU
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 the battery life the meter is automatically switched
off after 5 minutes of non-use. To reactivate it, simply press the
ON/OFF key.
• 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 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
• Wipe the cuvette thoroughly with
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
and check that the notch on 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
after approximately 25 seconds.
• 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
HI 93703-0 to obtain the final volume of 100 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:
Tn x 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 *
* 1 FTU = 1 NTU
• Each time the cuvette is used, tighten the cap to the same
• Discard the sample soon after the reading is taken to avoid
permanently clouding the glass.
• All glassware used to contain the standards and the samples
should be maintained clean, washed with HI 93703-50
cleaning solution and rinsed with HI 93703-0 or turbidity-free
• Collect the samples in clean glass or plastic bottles, fit stoppers
and perform the analysis quickly. If unavoidable, store the
sample in a cool, dark place, but not for longer than 24 hours
(the sample needs to be kept at room temperature prior to the
• To obtain a representative sample, gently, but thoroughly, mix
it before samples are taken. Do not shake (to prevent air
bubbles) and do not let the sample settle.
• It is recommended to monthly calibrate the meter with the
supplied HI 93703-10 @10 FTU* standard or more frequently
for greatest accuracy.
• Before inserting vials into the
instrument, wipe them with
HI 93703-70 soft, lint-free
tissue. Handle vials so that no
fingerprints can get on the
areas where light passes
(approximately 2 cm/1 inch
from the bottom of the vial).
If you experience any problems in taking measurements, please
contact your dealer or the nearest Hanna Instruments Customer
Service Department.
* 1 FTU = 1 NTU
• Presence of floating debris and coarse sediments which settle
out rapidly will give false readings.
• The infrared light source used for HI 93703 turbidity meter,
according to ISO 7027 International Standard, can effectively
minimize errors due to colored dissolved substances. This
effect, named “true color“, is a common interference for most
commercially available instruments operating in the range of
visible light.
• Air bubbles and the effect of vibrations that disturb the surface
of the sample will give false results.
• Dirty glassware could also affect readings along with scratched
or edged vials.
A monthly calibration is recommended. To check the date of last
calibration, simply hold the DATE/ key down for few seconds.
A more frequent check of the instrument is suggested by using the
supplied standard solution.
• Turn the meter on and wait for
the display to show “----“.
• Press the CAL key once, the
“CAL“ message will blink on
the display for about 5 seconds.
• After the 5 seconds interval the
current date is displayed for a
few seconds.
• Press the CAL key or wait a few
seconds to skip the date settings
and enter calibration.
• Press DATE/ key to set the
date. Year info start blinking.
• Press READ/key to change
the year value.
• Press DATE/ key and the
month value will blink.
• Press READ/ key to change
the month value.
• Press DATE/ key and the
day info will blink.
• Press READ/ key to set the
date value.
• Press DATE/ key and time
is displayed with hour item
• Press READ/ key to change
the hour value.
• Press DATE/key and the
minute info will blink.
• Press READ/key to change
the minutes.
• Press DATE/key and the
meter will ask for the first
calibration value.
• Take the HI 93703-0 bottle
containing the ZERO FTU*
Standard (or turbidity-free
dilution water) and fill the
measurement cuvette.
Note: In order to minimize any error introduced by the cuvette,
it is recommended to use, during calibration, the same cuvette
you are going to use to perform the measurement.
• Insert the cuvette with the
HI 93703-0 @ ZERO FTU*
standard solution (or turbidityfree dilution water) into the
measurement cell and press the
CAL key. A blinking “SIP“
message indicates that the
instrument is performing the
measurement. After approximately
50 seconds the instrument will
ask for the HI 93703-10
standard solution @10 FTU*
by displaying “10.0“.
• Repeat the same procedure with
HI 93703-10 @10 FTU*
standard solution.
• Insert the cuvette with the
HI 93703-10 AMCO-AEPA-1
standard @10 FTU* into the
measurement cell and press the
CAL key again.
• After the second calibration point
(10.00 FTU*) has been accepted,
the meter will display “500”,
asking for the 500 FTU* solution
to be placed in the cuvette holder.
Note:: At this point the user can exit the calibration mode and save
the two-point calibration by pressing READ/.
To perform a three-point calibration, place the 500 FTU* standard
solution in the cuvette holder.
• Press CAL: “SIP” and “CL” will
start blinking.
• After approximately 30 seconds,
the display will show “----“.
Now the meter is calibrated and
ready for use.
• If “ERR1“ is displayed, the calibration data are maintained.
• Press ON/ OFF key to exit calibration in any moment.
The display will show “----’ and meter enter measurement
* 1 FTU = 1 NTU
The instructions listed below should be carefully followed during
testing and during calibration:
• All glassware that comes into contact with standards should be
maintained clean. Wash with HI 93703-50 cleaning solution
and rinse with HI 93703-0 or turbidity free water.
• Rinse the vial twice with 5 ml of the liquid to be tested. This
removes the effect of any previous liquid and any dust or foreign
matter that may be present inside. Gently pour the liquid down
the side of the vial to reduce air bubbles (no mixing is required
when HI 93703-0 and HI 93703-10 AMCO-AEPA-1 standards
are used).
• Before inserting the vial into
the instrument, wipe it with
HI 93703-70 soft, lint-free
tissue. Handle vials so that no
fingerprints can get on the
areas where light passes
(approx. 2cm/1'' from the
bottom of the vial).
Presently, there are only two recognized primary standards:
AMCO-AEPA-1 and formazine.
HANNA instruments supplies HI 93703 with the AMCO-AEPA-1
which has a much longer shelf life at all concentrations (approximately six months, if free from contamination). In addition, no
special handling or disposal is required and a much higher stability
of suspended particles has been observed.
On the other hand, formazine is a very toxic substance, generated
by a known carcinogen, its stability is poor (particles flocculate and
settle quickly). Lower concentrations change value within a few
days or hours after dilution from stock solutions.
The consistency of HI 93703 readings by using both standards has
been separately established by Advanced Polymer Systems and
HANNA instruments.
Additional documentation about the formazine standard and more
complex calibration procedures is available upon request.
• Turn the meter on and wait for
the display to show “----“.
• Press and hold the DATE/
key and a “MM.DD“ message
appears for few seconds
followed by the time.
All components have been selected to minimize current drain
without compromising functionality.
In order to minimize the battery consumption, the meter is
equipped with an auto-off function which switches the meter off
after 5 minutes of non-use.
The power source are 4 alkaline batteries (1.5V AA) with an
expected life of 60 hours, or 900 measurements.
To always grant accurate measurements, the batteries are monitored
to ensure that readings are not taken when there is insufficient
A “LO BAT“ indication will appear on the lower right corner of the
display when the batteries are weak and require replacement. The
instrument can still perform approx. 50 measurements.
A “-BA-“ indication will appear on the display when the batteries
are too weak to perform reliable measurements. The message
appears for a few seconds, and then the meter will automatically
switch off. Batteries must be immediately replaced.
Battery replacement must only take place in a safe area and using
the battery types specified in this instruction manual.
To install or replace the batteries, turn
the unit off and unscrew the 2 screws
located on the back of the meter.
Remove the battery cover and insert
the new batteries in the compartment
while paying attention to the polarity.
After the batteries have been installed,
close the battery cover and tighten the
2 screws.
HI 93703 will display several different LCD messages to help the
user throughout all operations.
The meter is in a ready state and
measurement or calibration can be
Calibration mode is active. If the CAL
key is not pressed within 6 seconds, the
meter will automatically switch to the
measurement mode.
Calibration date setting mode is active.
0FTU* standard for calibration is
Calibration is in progress.
10FTU* standard for calibration is
Last calibration date (MM.DD).
“Sample In Progress“: measurement is
being performed.
* 1 FTU = 1 NTU
Low battery: when this message
appears, the instrument can still
perform approx. 50 measurements.
Batteries are too weak to ensure
reliable measurements. This message
appears for a few seconds, then the
meter will automatically switch off.
Batteries must be replaced immediately.
HI 731318
Tissue for wiping cuvettes (4 pcs.)
HI 731321
Spare glass cuvette (4 pcs.)
HI 731313
Maintenance kit: rugged carrying case including
HI 93703-0, HI 93703-10 and HI 93703-05
calibration standards, 1 tissue for wiping cuvettes
and 2 cuvettes
HI 93703-0
AMCO-AEPA-1 @0 FTU* calibration solution,
30 mL
HI 93703-05
AMCO-AEPA-1 @500 FTU* calibration
solution, 30 mL
HI 93703-10
AMCO-AEPA-1 @10 FTU* calibration solution,
30 mL
HI 93703-50
Cuvette cleaning solution, 230 mL
HI 93703 is guaranteed for two years against defects in workmanship
and materials when used for their intended purpose and maintained
according to instructions. This warranty is limited to repair or replacement free of charge. Damage due to accidents, misuse, tampering or
lack of prescribed maintenance is 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 problem. 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 Technical
Service department and then send it with shipping costs prepaid.
When shipping any instrument, make sure it is properly packed for
complete protection.
All rights are reserved. Reproduction in whole or in part is prohibited
without the written consent of the copyright owner.
* 1 FTU = 1 NTU
Recommendations for Users
Before using this product, make sure that it is entirely suitable for the
environment in which it is used.
Operation of this instrument 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 instrument's EMC performance.
To avoid electrical shock, do not use this instrument when voltages at
the measurement surface exceed 24 Vac or 60 Vdc.
To avoid damages or burns, do not perform any measurement in
microwave ovens.
Hanna Instruments reserves the right to modify the design,
construction or appearance of its products without advance notice.
Hanna Instruments Inc.
Highland Industrial Park
584 Park East Drive
Woonsocket, RI 02895 USA
Technical Support for Customers
Tel. (800) 426 6287
Fax (401) 765 7575
E-mail tech@hannainst.com
Local Sales and Customer Service Office
Printed in ROMANIA
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF