Hanna Instruments HI88713-01 User manual

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www.hannainst.com
HI88713
ISO Turbidity Meter
Instruction Manual

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TABLE OF CONTENTS
Dear Customer,
Thank you for choosing a Hanna Instruments product. This manual will provide you with the necessary
information for correct use of the instrument.
Please read this instruction manual carefully before using the instrument.
If you need additional technical information, do not hesitate to e‑mail us at [email protected] or
see the back side of this manual for our worldwide sales and technical service contacts.
This instrument is in compliance with directives.
PRELIMINARY EXAMINATION .....................................................................................................................3
GENERAL DESCRIPTION.............................................................................................................................3
ABBREVIATIONS.......................................................................................................................................4
PRINCIPLE OF OPERATION.........................................................................................................................4
FUNCTIONAL DESCRIPTION........................................................................................................................6
SPECIFICATIONS.......................................................................................................................................8
GENERAL TIPS FOR AN ACCURATE MEASUREMENT.......................................................................................9
START UP...............................................................................................................................................15
RANGE SELECTION..................................................................................................................................16
TUTORIAL MODE.....................................................................................................................................16
HELP MODE ...........................................................................................................................................17
MEASUREMENT PROCEDURE ..................................................................................................................17
CALIBRATION PROCEDURE ......................................................................................................................20
GOOD LABORATORY PRACTICE (GLP).........................................................................................................26
RESTORE FACTORY CALIBRATION .............................................................................................................26
LOG & LOG RECALL..................................................................................................................................27
SETUP ..................................................................................................................................................28
PC INTERFACE ........................................................................................................................................30
ACCESSORIES.........................................................................................................................................31
WARRANTY ............................................................................................................................................31
RECOMMENDATIONS FOR USERS.............................................................................................................31

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Please examine this Product carefully. Make sure the instrument is not damaged. If any damage has
occurred during the shipment, please contact your local Hanna Instruments Office.
This HI88713 Turbidity bench meter is supplied complete with:
• Six Sample Cuvettes and Caps
• Calibration Cuvettes
• Silicone Oil
• Cloth for wiping the cuvettes
• AC/DC power adapter
• Instruction Manual
• Instrument Quality Certificate
Note:Save all packing material until you are sure that the instrument works correctly. Any defective
item must be returned in the original packing with the supplied accessories.
PRELIMINARY EXAMINATION
The HI88713 Turbidity bench meter is a high accuracy, meter that benefits from Hanna Instruments’
years of experience as manufacturer of analytical instruments.
The HI88713 Turbidity bench meter meets and exceeds the requirements of ISO 7027 standard.
The instrument is based on a state‑of‑the‑art optical system which guarantees accurate results, assures
long term stability and minimizes stray light and color interferences. It also compensates for variations
in intensity of the LED, making no need for frequent calibration.
The 25 mm round cuvettes made from special optical glass guaranties reproductibility and consistency
of the measurements.
Turbidity measurements can be made in four modes: FNU (Formazin Nephelometric Units) ratio
mode FAU (Formazin Attenuation Units) NTU (Nephelometric Turbidity Units) NTU non‑ratio mode.
Alternative EBC (European Brewery Comitee) measuring units are available wen measuring in NTU modes.
Normal measurement, continuous measurement or signal averaging measurement can be selected,
depending on the sample and desired accuracy.
A two, three, four or five‑point calibration can be performed by using the supplied (<0.1, 15, 100,
750 FNU and 2000 NTU) standards, user prepared formar in standards can also be used in all modes.
Calibration points can be modified when they are used.
GENERAL DESCRIPTION
GENERAL DESCRIPTION

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ABBREVIATIONS
NTU Nephelometric Turbidity Units
FAU Formazin Attenuation Units
FNU Formazin Nephelometric Units
ISO International Organization for
Standardization
LCD Liquid Crystal Display
RTC Real Time Clock
RH Relative Humidity
ID Identification
EBC European Brewery Comitee
Turbidityis the optical property that causes light to be scattered and absorbed, rather than transmitted.
The scattering of the light as it passes through a liquid is caused by the suspended solids. The higher
the turbidity, the greater the amount of scattered light. The molecules in a very pure fluid scatter light
to a certain degree, no solution will have zero turbidity.
The ISO 7027 Method specifies the key parameters for the optical system and the method to measure
the turbidity of water.
The HI88713 Turbidity bench meter is designed to meet or exceed the criteria specified by the
ISO 7027, DIN 38404 and NF EN 27027.
The light beam that passes through the sample is scattered in all directions. The intensity and pattern
of the scattered light is affected by many variables including the wavelenght of the incident light,
particle size and shape, refractive index and color.
The optical system of the HI88713 turbidity bench meter uses an IR LED, a scattered light detector
(900) and a transmitted light detector (1800).
PRINCIPLE OF OPERATION
The HI88713 Turbidity bench meter features G.L.P. (Good Laboratory Practice) functions that allow
traceability of the calibration conditions. The last calibration points as well as time and date
The HI88713 Turbidity bench meter has a user‑friendly interface with an easy to understand, graphical
LCD. Comprehensive contextual help is available at a simple key press. All messages and help screens
are available in several languages. Furthermore, a tutorial mode guides the user step by step through
the analysis process.
The HI88713 features a logging function that can hold up to 200 measurements in the internal
memory. Data can be viewed directly on the screen or it can be downloaded to a PC for further analysis
using the HI92000 Windows®compatible software.

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For the ratio turbidity mode, the microprocessor of the instrument calculates the NTU value, from the
signals that reaches the two detectors, by using an effective algorithm. The optical system and measuring
technique compensate the color interference and also the LED intensity fluctuations, minimizing the
need of frequent calibration.
For the FNU and NTU non ratio modes the turbidity is calculated from the signal that reaches the
scattered light detector (90°).
In FAU mode the turbidity is calculated from the signal that reaches the direct light detector, while in
NTU ratio mode the turbidity is obtained from signal ratio on scatter and transmitted light detectors.
The non ratio methods are more sensitive to the LED intensity fluctuations.
The lower detection limit of a turbidimeter is determined by the “stray light”. Stray light is the light that
reaches the detectors and is not caused by light scattering from suspended particles.
The optical system of HI88713 instrument is designed to have very low stray light, providing accurate
results for low turbidity samples. However, special care must be taken when measuring low turbidities
(see page 9 “General Tips for an Accurate Measurement” for sample preparation and measuring
techniques).
MEASUREMENT UNITS
The meter is using specific units according to the selected measurement mode. For NTU modes the
EBC unit option is available 1 EBC=0.245 NTU. When measuring in NTU modes a conversion to EBC
units is also available 0.245 NTU=1 EBC.

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ON
OFF
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6
4
USB
POWER
12VDC
HI 88713 - ISO Turbidimeter
HELP
ESC CAL
RANGE RCL SETUP
LOG
0 - 1000 FNU
10 - 4000 FAU
0 - 980 EBC
0 - 4000 NTU
Turbidity
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INSTRUMENT DESCRIPTION
1) Liquid Crystal Display (LCD). The LCD has backlight for better visibility in dark environments.
2) Keypad. Splash proof resistant.
3) Cuvette Lid.
4) USB connector
5) 12 Vdc power input
6) ON/OFF switch
FUNCTIONAL DESCRIPTION

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DISPLAY DESCRIPTION
The display contains the following fields:
1) Current time
2) Functional keys
3) Selected mode
4) Measuring units
5) Measured value
KEYPAD DESCRIPTION
The keypad contains 8 direct keys and 3 functional keys with the following functions:
Press to perform the function displayed above it. The function are screen releated.
Press to exit the current screen.
Press to access measurement modes.
Press to scroll up in a menu and help or to increment a set value.
Press to scroll down in a menu and help or to decrement a set value. Press to log the
current reading.
Press to access calibration menu.
Press to recall the log.
Press to display the help screen.
Press to access the setup menu.
ESC
RANGE
LOG
CAL
RCL
HELP
SETUP

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SPECIFICATIONS
FNU mode
Range 0.00 to 9.99; 10.0 to 99.9; 100 to 1000 FNU
Resolution 0.01; 0.1; 1 FNU
Accuracy ±2% of reading plus straylight
FAU mode
Range 10.0 to 99.9; 100 to 4000 FAU
Resolution 0.1; 1 FAU
Accuracy ±10% of reading
NTU ratio mode
Range 0.00 to 9.99; 10.0 to 99.9; 100 to 4000 NTU
0.00 to 9.99; 10.0 to 99.9; 100 to 980 EBC
Resolution 0.01; 0.1; 1 NTU
0.01; 0.1; 1 EBC
Accuracy ±2% of reading plus straylight
±5% of reading above 1000 NTU
NTU non ratio mode
Range 0.00 to 9.99; 10.0 to 99.9; 100 to 1000 NTU
0.00 to 9.99; 10.0 to 99.9; 100 to 245 EBC
Resolution 0.01; 0.1; 1 NTU
0.01; 0.1; 1 EBC
Accuracy ±2% of reading plus straylight
Range selection Automatic
Repeatibility ±1% of reading or straylight, whichever is greater
Stray Light < 0.1 NTU (0.05 EBC)
Light Detector Silicon Photocell
Method ISO 7027 Method
Measuring mode Normal, Average, Continuous.
Turbidity Standards <0.1, 15, 100, 750 FNU and 2000 NTU
Calibration Two, three, four or five‑point calibration
Light Source IR LED
Lamp life Instrument life
Display 40 x 70mm graphic LCD (64x128 pixels) with backlight
LOG Memory 200 records
Serial Interface USB
Environment 0 °C (32 °F) to 50 °C (122 °F); max 95% RH non‑condensing
Power supply 12 Vdc power input
Dimensions 230 x 200 x 145 mm (9 x 7.9 x 5.7”) L x W x H
Weight 2.5 Kg (88 oz.)

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Note: If you are using multiple cuvettes, always match the cuvettes.
CUVETTE HANDLING
The cuvettes should be free of scratches or cracks. Any cuvette with visible scratches should be
discarded. The cuvettes should be periodically washed with acid. After washing, the cuvettes should
be rinsed well with distilled or deionized water, multiple times. Allow cuvettes to air‑dry and store
them for long periods of time with theire caps, to avoid dirt entering inside. Always handle the
cuvette by touching only the cap or its top side (over the horizontal line).
Always store the cuvettes in separate boxes or with separators between them to avoid scratches
on the surface.
CUVETTE PREPARATION
Whenever a cuvette is used, it must be clean inside and outside. When it is placed into the instrument,
it must be dry outside, completely free of fingerprints or dirt.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT
The HI88713 is a highly accurate bench too turbidity meter. Special care must be taken during
calibration and sample preparation to optimize the instrument performance and to fully benefit from
its features. Is very important for the analyst to use proper measurement techniques for accurate,
precise and repeatable readings. The instructions listed below should be carefully followed during
calibration and measurement to ensure optimum accuracy.
GENERAL RULES
• Always put the instrument on a flat, rugged surface when taking measurements.
• Do not operate in direct sunlight.
• Keep the lid of the instrument closed when it is not used to prevent dust or dirt entering inside.
• Always close the cuvette lid during measurement.
• Always use cuvettes without scratches or cracks because they can cause inaccurate readings.
• Always cap the cuvettes to prevent the sample from spilling
• To prevent contamination of the optical system, do not use to much oil.
• When using multiple cuvettes, they should be indexed and matched, when possible.
CUVETTE
The cuvette is part of the optical system in all measurements. The light reaches the sample by passing
through the cuvette glass. As a result, the measurement can be affected by the glass imperfections,
dirt, dust, scratches, or fingerprints present on the cuvette surface. Special care must be taken in
preparing and handling the cuvette.

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If the cuvette is not indexed, use the factory marking to align the cuvette with the marking on the
cuvette holder.
CUVETTE OILING
To hide minor imperfections and scratches, the cuvettes should be oiled outside with the supplied
silicone oil. This is very important, especially for low turbidity samples (< 1 FNU), otherwise scratches
can contribute and alter turbidity readings.
The silicone oil has the same refractive index as the glass and will not alter the turbidity readings. It
is important to apply only a thin layer of silicone oil.
Warning: Do not apply silicone oil in excess because it may retain dirt or contaminate the cuvette
holder of the instrument, altering the turbidity readings.
It is very important to apply the silicone oil on a clean, dry cuvette. Apply a few drops of oil and wipe
the cuvette thoroughly with a lint‑free cloth. Wipe off the excess oil till you obtain a thin, uniform
layer. If the procedure is correctly followed, the cuvette should appear nearly dry with no visible oil.
Note: The supplied cloth for oiling should be stored together with the silicone oil bottle and cuvettes,
taking care to avoid contamination with dirt. After a few oiling procedures, the cloth will contain
enough oil to wipe the bottle with it without adding more oil. From time to time add some
drops of oil on the cuvette to provide the necessary oil quantity in the cloth.
INDEXING A CUVETTE
It is very important for low turbidity readings to always insert the cuvette into the instrument in
the same position. All cuvettes are factory indexed. The factory mark on the cuvette can be used to
align the cuvette with sign on the cuvette holder.
10 ml
10 ml
10 ml
CUVETTE PREPARATION
Whenever a cuvette is used, it must be clean inside and outside. When it is placed into the instrument,
it must be dry outside, completely free of fingerprints or dirt.