Hanna Instruments HI 93703-11 User manual

INSTRUCTION MANUAL
HI93703-11
Portable Logging
Turbidity Meter
with RS232

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.
Thank you for choosing a Hanna Instruments product.
Please read this instruction manual carefully before
using the meter. For more information about Hanna
Instruments and our products, visit www.hannainst.com
or e-mail us at [email protected].
For technical support, contact your local Hanna Instruments
Office or e-mail us at [email protected].
Dear
Customer,

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TABLE OF CONTENTS
TABLE OF CONTENTS
1. PRELIMINARY EXAMINATION .................................................4
2. GENERAL DESCRIPTION.........................................................5
3. PRINCIPLE OF OPERATION.....................................................7
4. FUNCTIONAL DESCRIPTION....................................................8
5. SPECIFICATIONS...................................................................9
6. OPERATIONAL GUIDE..........................................................10
6.1. MEASUREMENT PROCEDURE......................................10
6.2. LOG-ON-DEMAND.....................................................12
6.3. CLEARING LOGGED DATA............................................13
6.4. VIEWING LOGGED DATA.............................................13
6.5. VIEWING AND SETTING DATE AND TIME......................14
6.6. ERROR CODES ..........................................................15
7. CALIBRATION .....................................................................18
7.1. CALIBRATION PROCEDURE.........................................18
7.2. VIEWING CALIBRATION DATE .....................................20
7.3. VIEWING FIRMWARE VERSION...................................20
7.4. ENSURE ACCURATE CALIBRATION...............................21
7.5. STANDARD SUSPENSION...........................................21
8. BATTERY REPLACEMENT ......................................................22
9. PC CONNECTION.................................................................23
10. ACCESSORIES...................................................................24
CERTIFICATION........................................................................25
RECOMMENDATIONS FOR USERS..............................................25
WARRANTY .............................................................................26

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PRELIMINARY EXAMINATION
1. PRELIMINARY EXAMINATION
Remove the meter from the packing material and examine it carefully.
For further assistance, please contact your local Hanna Instruments
Office or email us at [email protected].
Each HI93703-11 is delivered in rugged carrying case and is
supplied with:
• Glass cuvette with cap
• Batteries (4 x 1.5V AA)
• Instruction manual
Note: Ensure that the meter functions correctly and save all
packing material. Items that need to be returned must be
returned in their original packing material with the supplied
accessories.

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GENERAL DESCRIPTION
2. GENERAL DESCRIPTION
With HI93703-11 turbidity measurements can be performed with
high precision in the field as well as in the laboratory. HI93703-11
turbidity meter is a microprocessor-based 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.
HI93703-11 also includes a real-time clock and log-on-demand
capability. The PC communication is made through a serial port of
your computer and the 5-pin socket on the meter.
Note: HI93703-11 has been designed according to the ISO
7027 International Standard, consequently the turbidity
measurement units are expressed in FTU (Formazine Turbidity
Unit). FTU is identical to the other internationally recognized
unit: NTU (Nephelometric Turbidity Unit).
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 5-minutes of non-use. This
feature is disabled when the meter is connected to the serial port of
the computer.
All operations can be carried out with only five keys and
troubleshooting functions can be performed with displayed error code
guides.
A 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.
Two or three point calibration (0,10, 500 FTU*) can be easily
performed using available standards, and the last calibration date is
automatically stored for future retrivial.
We have chosen 10 FTU* as the standard calibration point because
it best fits the water turbidity measurements in different applications,
from drinking water to wastewater treatment.
* 1 FTU = 1 NTU

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GENERAL DESCRIPTION
HANNA instruments® uses the primary standard AMCO-AEPA-1 to
avoid all formazine-related problems. Formazine is a 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.
HI93703-11 can be used with both standards.

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PRINCIPLE OF OPERATION
3. PRINCIPLE OF OPERATION
HI93703-11 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.
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:
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
* 1 FTU = 1 NTU

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FUNCTIONAL DESCRIPTION
4. FUNCTIONAL DESCRIPTION
1. Measurement cell
2. LCD (Liquid Crystal Display)
3. ON/OFF/CLR key, to turn the meter ON and OFF, and to clear
log memory
4. GLP/CAL key, to display last calibration date & time, and to
enter calibration mode
5. STO/VIEW key, to store sample after reading, and to view log
memory
6. READ/DATE key, to perform measurements, and to display
(toggle) current date/time
7. ALT key, to activate the second functions (second function keys
in orange)
8. RS232 connector (5 pin)

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SPECIFICATIONS
5. SPECIFICATIONS
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 is greater)
Calibration 3 point (0, 10 and 500 FTU*)
Light Source Infrared LED
Light Source Life Life of the instrument
Light Detector Silicon photocell
Data Logging 199 measurements, on-demand
PC Connection Through serial port, using HI920011
connection cable and HI92000
Windows® compatible software
Battery Type 4 x 1.5V AA alkaline batteries
Battery Life Approx. 60 hours of continuous use or 900
measurements
Auto-off After 5 minutes of non-use
Environment 0 to 50°C (32 to 122°F);
RH max 95% non-condensing
Dimensions 220 x 82 x 66 mm
(8.7 x 3.2 x 2.6”)
Weight 510 g (1.1 lb.)
* 1 FTU = 1 NTU

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OPERATIONAL GUIDE
6. OPERATIONAL GUIDE
To prepare the instrument for taking measurements, first install
the batteries (see Battery Replacement section) and then turn the
instrument on.
To maximize battery-life, the display is automatically switched off
after 5-minutes of non-use. To reactivate the display, simply press
the ON/OFF key.
6.1. 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.
• The meter will carry out a battery test showing in percentage the
battery life left.
• When the LCD displays “----” the meter is ready to measure.
• Fill a clean cuvette up to one quarter inch (0.5cm) from its rim
with the thoroughly agitated sample.

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OPERATIONAL GUIDE
• Allow sufficient time for bubbles to escape before securing the cap.
Note: Do not overtighten the cap.
Note: Wipe the cuvette thoroughly with a lint-free tissue
(HI93703-70) 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
(approx. the bottom 2 cm/1”).
• 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 20 seconds.

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OPERATIONAL GUIDE
Even though HI93703-11 covers a very wide range of turbidity
values, for very accurate measurements of samples exceeding
40FTU*, Standard Methods require dilution. In such cases, the
correct amount of HI93703-0 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 to
obtain the final volume of 100 mL.
T = HI93703 reading (exceeding 40FTU*)
E.g.: HI93703 reading = 200 FTU *
3000 / 200 = 15 mL (Vos)
15 mL (Vos)+85 mL (HI93703-0) = 100 mL
At this point, take a sample of this solution and measure its turbidity.
The correct turbidity value of the original sample will be:
Tnx 100 mL / Vos = Ta
where:
Tn= new HI93703 reading
Ta= actual turbidity value of the original sample
E.g. If Tn= 27 FTU *
Ta= 27 FTU* x 100 mL / 15 mL = 180 FTU*
Note: Any sample taken above 1000 FTU will show out of range
by blinking “1000”.
6.2. LOG-ON-DEMAND
• After taking a reading, press the STO button. The last sample read
will be stored in memory. The display will also show on the bottom
right corner the reference number of the stored sample.
* 1 FTU = 1 NTU

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OPERATIONAL GUIDE
Note: When the maximum number of samples has been reached
(199), the LCD display will show “FULL”. This is a warning that
you will be overwriting the oldest sample recorded. To store
the current sample, press the STO button again and this will
overwrite the oldest sample in the memory. All samples are
shifted (reference numbers reduced by one). Sample number
one remains the oldest sample.
6.3. CLEARING LOGGED DATA
• Press the ALT & CLR buttons together. The display will show “CLR”
for confirmation. Press ALT & CLR again to clear memory. To abort
the operation, press any button.
All samples previously stored will be erased from memory!
6.4. VIEWING LOGGED DATA
• Press the ALT & VIEW buttons together. The last sample will be
displayed.

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OPERATIONAL GUIDE
• Press the right arrow to scroll between turbidity value, date and
time of the sample.
• Press the UP/DOWN arrows to view the samples and use the right
arrow to scroll the date and time .
• Press ALT & VIEW again to exit this mode.
6.5. VIEWING & SETTING DATE & TIME
Viewing
• Press ALT & DATE to toggle between date and time.
Setting
• Press and hold ALT & DATE for 3-4 seconds.
• Press UP/DOWN to correct and set the year.

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OPERATIONAL GUIDE
• Press right arrow to scroll to month and day, use UP/DOWN to set.
• Press right arrow again to scroll to time, use UP/DOWN to set.
• Press right arrow again to save and exit date and time setup.
Note: Press ALT & DATE to leave this mode without saving.
6.6. ERROR CODES
Every time the meter is switched on, the Real Time Clock and EEPROM
are tested, and if an error is found the corresponding error code will
be displayed.
The list of error codes is as follows:
• NO cover error (check cuvette position)
• Calibration error (check calibration standard value)
• Real Time Clock error*
• EEPROM error*

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OPERATIONAL GUIDE
• Internal communication error*
• Internal Bus error*
* Contact the Hanna Instruments office nearest to you.
Ensure Accurate Measurements
• Each time the cuvette is used, tighten the cap to the same degree.
• 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 the HI93703-50
cleaning solution and rinsed with HI93703-0 or turbidity-free
water.
• Collect the samples in clean glass or plastic bottles, fit stoppers
and perform the analysis quickly. If necessary, store the sample in
a cool, dark place, for up to a maximum of 24 hours (the sample
needs to be kept at room temperature prior to the analysis).
• 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 calibrate the meter with the supplied
HI93703-10 @10 FTU* standard at least once a month or more
frequently for greater accuracy.
• Before inserting vials into the instrument, wipe them with
HI93703-70 or a soft, lint-free tissue. Handle vials so that no
fingerprints get on the areas where light passes (approx. the
bottom 2 cm/1 inch).
If you experience any problems in taking measurements, contact your
nearest Hanna Customer Service Center.
* 1 FTU = 1 NTU

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OPERATIONAL GUIDE
Sources of Interference
• Presence of floating debris and coarse sediments which settle out
rapidly will give false readings.
• The infrared light source used for HI93703-11 turbidity meter,
complies with the ISO 7027 International Standard and can
effectively minimize any errors due to colored dissolved substances.
This effect, called “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 may give false results and should be avoided.
• Dirty glassware could also affect readings along with scratched or
dented vials.

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CALIBRATION
7. CALIBRATION
To check the date of last calibration, simply press the GLP/CAL key.
Press again to toggle between date and time.
To make sure that the meter is calibrated, take a measure of a
standard solution.
The instrument can be calibrated at two or three points and a monthly
calibration is recommended.
7.1. CALIBRATION PROCEDURE
• Turn the meter on and wait for the display to show “----”.
• Press the ALT & CAL buttons together. The “CAL” message will
blink on the display 3 times. The meter then enters the calibration
mode, displaying “0.00 cl” and prompting the user to insert the
0.00 FTU standard.
• Place the 0.00 FTU standard in the cuvette holder.
• Press CAL, SIP and CL will start blinking.

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CALIBRATION
• If “ERR1” appearson the LCD, please check the standard solution.
• After approximately 30 seconds the meter will display 10.00,
prompting the user to place the 10.00 FTU standard solution in
the cuvette holder.
• Place the 10.00 FTU standard in the holder press CAL, SIP and CL
will start blinking.
• After approximately 30 seconds the meter will display 500, asking
the user to place the 500 FTU buffer solution in the cuvette 500
holder.
NOTE: At this point the user can save the two point calibration
setup by pressing ALT & CAL buttons, leaving the calibration
mode.
• To perform a three point calibration, place the 500 FTU standard
solution in the cuvette holder.

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CALIBRATION
• Press CAL, SIP and CL will start blinking.
• After approximately 30 seconds the LCD will display “----”. Now
the instrument is calibrated and ready for use.
Note: If “ERR1” is displayed, the calibration data is maintained.
7.2. VIEWING CALIBRATION DATE
To display the last calibration time and date, press the GLP button
to toggle through the date and time. If the display shows “FS”, the
instrument has factory calibration settings loaded and no date will
be displayed.
7.3. VIEWING FIRMWARE VERSION
To display the firmware version press and hold the ON/OFF key for
approx. ten seconds (when turning the meter on).
The firmware version will be displayed.