Hanna-instruments HI 98703 Manual de usuario Pagina 16
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• Open the instrument lid, slightly rotate the cuvette and take a new reading.
• Repeat the last step for the second cuvette until the reading is within 0.01 NTU of the value
obtained for the first cuvette.
• Alternatively, keep READ u pressed and, after the first value is displayed, open the lid and start
rotating the cuvette until the displayed value matches the first cuvette.
• Mark this position on the second cuvette with a water resistant pencil.
• Follow the same procedure for all the necessary cuvettes.
Note: If the cuvette is indexed, use the index to position it in the instrument.
SAMPLING TECHNIQUE
When taking turbidity measurements it is very important to select a representative sample. For
consistent results, follow the next tips when sampling:
• Gently mix the water before taking the sample.
• If the sample is taken from a pipe, discard the first few liters.
• If measuring a non uniform source, collect samples from different places and mix them.
When measuring the collected sample, keep in mind the following:
• Samples should be analyzed immediately after collection because the turbidity can change in
time.
• To avoid dilution of the sample it is better to rinse the cuvette with a quantity of sample and then
discard. Only after this you can fill the cuvette with sample.
• Pay attention that cold samples do not condense on the sample cell.
REMOVING AIR BUBBLES
Any air bubbles present in the sample will cause high turbidity readings. To obtain accurate
measurements, remove the air bubbles using one of these methods:
• Application of a partial vacuum;
• Addition of a surfactant, such as Triton X-100;
• Use of an ultrasonic bath;
• Heating the sample.
Sometimes it is necessary to combine two or more methods for efficient air bubble removal.
Note: Each method can alter the sample turbidity, if misused, so they have to be used with caution.
- HI 98703 1
- TABLE OF CONTENTS 2
- WARRANTY 2
- PRELIMINARY EXAMINATION 3
- GENERAL DESCRIPTION 4
- TAG IDENTIFICATION SYSTEM 5
- ABBREVIATIONS 5
- PRINCIPLE OF OPERATION 6
- MEASUREMENT UNITS 7
- FUNCTIONAL DESCRIPTION 8
- SPECIFICATIONS 11
- CUVETTE HANDLING 12
- CUVETTE PREPARATION 12
- CUVETTE OILING 13
- INDEXING A CUVETTE 13
- MATCHING MULTIPLE CUVETTES 15
- USE OF AN ULTRASONIC BATH 17
- APPLICATION OF VACUUM 17
- ADDITION OF SURFACTANT 17
- HEATING THE SAMPLE 18
- MEASUREMENT PROCEDURE 19
- NORMAL MEASUREMENT 20
- CONTINUOUS MEASUREMENT 20
- AVERAGED MEASUREMENT 20
- RANGE AND UNITS 21
- CALIBRATION PROCEDURE 22
- TWO-POINT CALIBRATION 23
- THREE-POINT CALIBRATION 24
- FOUR-POINT CALIBRATION 24
- LOG SEARCHING 27
- RECORD VIEWING 27
- DELETE LAST RECORD 28
- DELETE ALL RECORDS 28
- LCD BACKLIGHT 35
- TAG INSTALLATION 35
- BATTERIES MANAGEMENT 36
- LAMP REPLACEMENT 36
- ERROR CODES 38
- PC INTERFACE 38
- ACCESSORIES 39
- Printed in ROMANIA 40
- MAN98703 06/14 40
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