Hanna Instruments HI 88703 Manual de usuario

www.hannainst.com

HI 88703

Turbidity Meter

Instruction Manual

TABLE OF CONTENTSTABLE OF CONTENTS

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 FOR RATIO/NON RATIO TURBIDITY RANGE .................................................. 17

CALIBRATION PROCEDURE FOR RATIO/NON RATIO TURBIDITY RANGE ..................................................... 20

GOOD LABORATORY PRACTICE (GLP) ...................................................................................................... 25

RESTORE FACTORY CALIBRATION ........................................................................................................... 25

LOG & LOG RECALL ............................................................................................................................... 26

SETUP ................................................................................................................................................. 27

LAMP REPLACEMENT ............................................................................................................................. 30

FUSE REPLACEMENT .............................................................................................................................. 30

PC INTERFACE ....................................................................................................................................... 30

ACCESSORIES ....................................................................................................................................... 31

WARRANTY ........................................................................................................................................... 31

RECOMMENDATIONS FOR USERS .......................................................................................................... 31

Please examine this Product carefully. Make sure the instrument is not damaged. If any damage has

occurred during the shipment, please notify your dealer.

This HI 88703 Bench Turbidity meter is supplied complete with:

• Five Sample Cuvets and Caps

• Calibration Cuvets for turbidimeter

• Silicone Oil

• Tissue for wiping the cuvets

• Power cord

• 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 EXAMINATIONPRELIMINARY EXAMINATION

PRELIMINARY EXAMINATION

HI 88703 is a high accuracy, meter that benefits from Hanna’s years of experience as manufacturer

of analytical instruments.

The HI 88703 is especially designed for water quality measurements, providing reliable and

accurate readings on low turbidity. The HI 88703 meets and exceeds the requirements of USEPA

and Standard Methods.

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 lamp, making no need for frequent calibration.

The 25 mm round cuvets made from special optical glass guarantee the repeatability and consistency

of the measurements.

Turbidity measurements

can be made in the 0.00 to 4000 NTU (Nephelometric Turbidity Units)

range when ratiometric measurements are used and in the 0.00 to 40.0 NTU range when non ratio

method is used. The instrument has an EPA compliance reading mode which rounds the reading to

meet EPA reporting requirements. Alternative EBC and Nephelos measuring units are available.

Depending on the measured sample and needed accuracy, normal measurement, continuous

measurement or signal averaging measurement can be selected.

A two, three, four or five-point calibration could be performed by using the supplied (<0.1, 15,

100, 750 and 2000 NTU) standards. When user prepared standards are used, the calibration points

can be modified.

GENERAL DESCRIPTION

GENERAL DESCRIPTIONGENERAL DESCRIPTION

GENERAL DESCRIPTION

ABBREVIATIONSABBREVIATIONS

ABBREVIATIONS

NTU Nephelometric Turbidity Units

JTU Jackson Turbidity Units

FTU Formazin Turbidity Units

USEPA US Environmental Protection Agency

LCD Liquid Crystal Display

RTC Real Time Clock

RH Relative Humidity

ID Identification

EBC European Brewery Comitee

Turbidity is the optical property that causes light to be scattered and absorbed, rather than transmitted.

The scattering of the light that passes through a liquid is primarily caused by the suspended solids. The

higher the turbidity, the greater the amount of scattered light. Because even the molecules in a very pure

fluid scatter light to a certain degree, no solution will have zero turbidity.

The USEPA Method 180.1 specify the key parameters for the optical system to measure turbidity

for drinking, saline and surface water in a 0 to 40 NTU range, using the nephelometric method.

The HI 88703 instrument is designed to meet or exceed the criteria specified by the USEPA Method

180.1 and Standard Method 2130 B.

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 like wavelenght of the incident light, particle size

and shape, refractive index and color.

The optical system includes a tungsten filament lamp, a scattered light detector (900) and a

transmitted light detector (1800).

PRINCIPLE OF OPERATIONPRINCIPLE OF OPERATION

PRINCIPLE OF OPERATION

HI 88703 has complete G.L.P. (Good Laboratory Practice) functions that allows traceability of the

calibration conditions. The last calibration points, time and date can be checked.

HI 88703 has a user-friendly interface with an easy to understand, graphical LCD. All messages are

in plain text, easy to read and understand. Comprehensive contextual help is available at a simple

key press. All messages and helps are available in several languages. Confirmation and error acoustic

signals help the user during instrument operation. Furthermore, a tutorial mode of operation guides

the user step by step through the analysis process.

The instrument’s logging function offers complete information for the measurement. Up to 200

measurements can be stored in the internal memory and consulted at any time. In order to further

store or analyse, the data can be downloaded to a PC using the USB port.

For the ratio turbidimeter range, the microprocessor of the instrument calculates the NTU value, from

the signals that reaches the two detectors, by using an effective algorithm. This algorithm corrects

and compensates for interferences of color, making the HI 88703 instrument color-compensated.

The optical system and measuring technique compensate also for the lamp intensity fluctuations,

minimizing the need of frequent calibration.

For the non ratio turbidimeter range, the NTU value is calculated from the signal on the scattered

light detector (90°). The method offers a high linearity on the low range. The method is more

sensitive to the lamp intensity fluctuations.

The lower detection limit of a turbidimeter is determined by the so called “stray light”. Stray light is the light

detected by the sensors, that is not caused by light scattering from suspended particles.

The optical system of HI 88703 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 most used units for turbidity are NTU (Nephelometric Turbidity Units). In the beer industry a

common unit is EBC (European Brewery Comitee).

The HI 88703 turbidimeter reports the measurements in NTU, EBC or Nephelos. One NTU is

equal with 0.245 EBC or 6.7 Nephelos.

Calibration and measurements are done only in NTU and the results in other units are obtained

by multiplying with the respective factors.

FUNCTIONAL DESCRIPTIONFUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION

INSTRUMENT DESCRIPTION

1) Liquid Crystal Display (LCD). The LCD has backlight for better visibility in dark environments.

2) Keypad. Splash proof resistant.

3) Cuvet Lid. Close the cuvet lid prior to start a measurement.

4) Lamp lid and the related fixing screw

5) USB connector

6) Fuse holder

7) Mains switch

8) Mains connector

DISPLAY DESCRIPTION

The display contains the following fields:

1) The current time in selected format

2) Information related to the measurement

3) Functional keys

4) Currently selected parameters

5) Measuring units

6) Measured value

KEYBOARD DESCRIPTION

The keyboard contains 8 direct keys and 3 functional keys with the following functions:

The function of each of the three functional keys depends on the name

displayed on the LCD above them.

ESC

Press to return to the main screen.

RANGE

When in the main screen, press to access the change parameter screen.

Press to move up in menu and help or to increment a set value.

LOG

Press to move down in menu and help or to decrement a set value. Press

to log the current reading.

CAL

Press to access calibration menu.

RCL

Press to recall the log.

HELP

Press to display the help screen.

SETUP

Press to access the setup screen.

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

Range - non ratio mode 0.00 to 9.99; 10.0 to 40.0 NTU

0.0 to 99.9; 100 to 268 Nephelos

0.00 to 9.80 EBC

Resolution - non ratio mode 0.01; 0.1 NTU

0.1; 1 Nephelos

0.01 EBC

Range - ratio mode 0.00 to 9.99; 10.0 to 99.9; 100 to 4000 NTU

0.0 to 99.9; 100 to 26800 Nephelos

0.00 to 9.99; 10.0 to 99.9; 100 to 980 EBC

Resolution - ratio mode 0.01; 0.1; 1 NTU

0.1; 1 Nephelos

0.01; 0.1, 1 EBC

Range selection Automatically

Accuracy ±2% of reading plus 0.02 NTU (0.15 Nephelos; 0.01 EBC)

±5% of reading above 1000 NTU (6700 Nephelos; 245 EBC)

Repeatibility ±1% of reading or 0.02 NTU (0.15 Nephelos; 0.01 EBC)

whichever is greater

Stray Light < 0.02 NTU (0.15 Nephelos; 0.01 EBC)

Light Detector Silicon Photocell

Method Nephelometric method (90°) or Ratio Nephelometric Method

(90° & 180°), Adaptation of the USEPA Method 108.1 and

Standard Method 2130 B.

Measuring mode Normal, Average, Continuous.

Turbidity Standards <0.1, 15, 100, 750 and 2000 NTU

Calibration Two, three, four or five-point calibration

Light Source Tungsten filament lamp

Lamp life greater than 100,000 readings

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 230 V/50 Hz or

115 V/60 Hz 20 W

Auto Shut-off After 15 minutes of non-use

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.)

Note: If you are using multiple cuvets, always match the cuvets.

CUVET HANDLING

The cuvets should be free of scratches or cracks. Any cuvet with visible scratches will be

discarded. The cuvets should be periodically washed with acid. After washing, the cuvets should

be well rinsed multiple times with distilled or deionized water. Allow cuvets to air-dry and store

them for long periods of time with caps, to avoid dirt entering inside. Always handle the cuvet

by touching only the cap or its top side (over the horizontal line).

Always store the cuvets in separate boxes or with separators between them to avoid scratches on

the surface.

CUVET PREPARATION

Whenever a cuvet 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 MEASUREMENTGENERAL TIPS FOR AN ACCURATE MEASUREMENT

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

HI 88703 is a highly accurate combined meter for turbidity and free & total chlorine. To meet the

instrument’s performance and fully benefit of its features, it is very important for the analyst to use

proper measurement techniques for accurate, precise and repeatable readings. Special care must be

taken during sample preparation and handling. The instructions listed below should be carefully

followed during measuring and calibration to ensure best 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 lid of the instrument during measurement.

• Always use cuvets without scratches or cracks because they can cause inaccurate readings.

• Always cap the cuvets to avoid spillage of the sample into the instrument.

• Do not use too much oil to prevent contamination of the optical system.

• If possible use indexed and matched cuvets.

• If possible use the same cuvet for zero and read for Free and Total Chlorine measurements.

CUVET

The cuvet is part of the optical system in all measurements. The light reaches the sample by

passing through the cuvet glass. As a result, the measurement can be affected by the glass

imperfections, dirt, dust, scratches, or fingerprints present on the cuvet surface. Special care must

be taken in preparing and handling the cuvet.

If the cuvet is not indexed, put the cuvet with the factory mark aligned with the sign on the

instrument top.

CUVET OILING

To hide minor imperfections and scratches, the cuvets should be oiled outside with the supplied silicone oil.

This is very important, especially for low turbidity samples (< 1 NTU), 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 cuvet

holder of the instrument, altering the turbidity readings.

It is very important to apply the silicone oil on a clean, dry cuvet. Apply a few drops of oil and wipe

the cuvet 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 cuvet should appear nearly dry with no visible oil.

Note: The supplied cloth for oiling should be stored together with the silicone oil bottle and cuvets,

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 cuvet to provide the necessary oil quantity in the cloth.

INDEXING A CUVET

It is very important for low turbidity readings to always insert the cuvet into the instrument in the

same position.

All cuvets are factory indexed. This index can be used to put the cuvet with the factory mark on the

cuvet aligned with the sign on the instrument top.

To further reduce the effect of glass imperfections, the cuvet can be indexed and use this new index

as the position mark.

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