Instruction Manual
HI 93703
Portable Microprocessor
Turbidity Meter
This Instrument is in Compliance with the CE Directives
1
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 necessary 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 |
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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 |
HowToEnsureAccurateMeasurements . 11 |
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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 |
2
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. HI 93703 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 bat- tery-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 |
4 |
|
PRINCIPLE OF OPERATION
HI 93703 has been designed to perform measurements according to the ISO 7027 International Standard.
The instrument functions by passing a beam of infraredlightthroughavialcontainingthesample 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.
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LIGHT |
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DETECTOR |
IR LED |
90° SCATTERED |
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|
EMITTED LIGHT (890 nm) |
LIGHT |
|
CUVET
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
5
FUNCTIONAL DESCRIPTION
1
2
3 |
6 |
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4 |
5 |
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1)MeasurementCell
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
6
SPECIFICATIONS
|
HI93703 |
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Range |
0.00 to 50.00 FTU * |
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50 to 1000 FTU * |
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Resolution |
0.01 and 1 FTU * |
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Accuracy |
±0.5 FTU* or ±5% |
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of reading (whichever greater) |
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|
EMC Typical |
±2% Full Scale |
Deviation |
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Light Source |
HighEmissionInfraredLED |
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Light Source Life |
Life of the instrument |
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Light Detector |
SiliconPhotocell |
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Power Source |
4 x 1.5V AA batteries |
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Battery Life |
60 hours or 900 measurements |
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Auto-Shut off |
After 5 minutes |
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Operating |
0 to 50°C (32 to 122°F); |
Conditions |
0 to 95% RH (non-condensing) |
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Dimensions |
220 x 82 x 66 mm |
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(8.7 x 3.2 x 2.6") |
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Weight |
510 g (18 oz.) |
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|
* 1 FTU = 1 NTU
7
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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