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 Preliminary Examination ............................ 3 General Description ....................................
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.
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 battery-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.
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 infrared light through a vial containing the sample 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.
FUNCTIONAL DESCRIPTION 1 2 6 3 4 5 1) 2) 3) 4) 5) Measurement Cell LCD (Liquid Crystal Display) ON/OFF Key CAL Key, to enter the Calibration Mode 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 Range 0.00 to 50.00 FTU * 50 to 1000 FTU * Resolution Accuracy 0.01 and 1 FTU * ±0.5 FTU* or ±5% of reading (whichever greater) EMC Typical Deviation Light Source Light Source Life ±2% Full Scale High Emission Infrared LED Life of the instrument Light Detector Silicon Photocell Power Source 4 x 1.
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.
• Wipe the cuvet thoroughly with a lint-free tissue (HI 93703-70) before inserting into the measurement cell. The cuvet must be completely free of fingerprints and other oil or dirt, particularly in the area where the light goes through (approximately the bottom 2 cm/1 inch of the cuvet). • Place the cuvet into the cell and check that the notch on the cap is positioned securely into the groove. • The mark on the cuvet cap should point towards the LCD.
• Even though HI93703 covers a very wide range of turbidity values, for very accurate measurements of samples exceeding 40 FTU *, Standard Methods require dilution. In such cases, the correct amount of HI 93703-0 or turbidity-free water to be added to the sample can be calculated as follows: Vos = 3000 / T where: Vos = volume of sample combined with HI obtain the final 100 mL. T = HI 93703 reading 40FTU*) (mL) to be 93703-0 to volume of (exceeding E.g.
HOW TO ENSURE ACCURATE MEASUREMENTS • Each time the cuvet 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 HI 93703-50 cleaning solution and rinsed with HI 93703-0 or turbidity-free water. • Collect the samples in clean glass or plastic bottles, fit stoppers and perform the analysis quickly.
SOURCES OF INTERFERENCE • Presence of floating debris and coarse sediments which settle out rapidly will give false readings. • The infrared light source used for HI 93703 turbidity meter, according to ISO 7027 International Standard, can effectively minimize errors due to colored dissolved substances. This effect, named "true color", is a common interference for most commercially available instruments operating in the range of visible light.
CALIBRATION A monthly calibration is recommended. To check the date of last calibration, simply hold the DATE/⇒ key down for few seconds. A more frequent check of the instrument is suggested by using the supplied standard solution. CALIBRATION PROCEDURE • Turn the meter on and wait for the display to show "----". • Press the CAL key once, the "CAL" message will blink on the display for about 6 seconds, then the calibration mode stops. • While the "CAL" message is still blinking, press CAL again.
• To confirm the displayed data values and to go to the next step, press the CAL key once. A blinking "ZERO" message will appear. • Take the HI 93703-0 bottle containing the ZERO FTU* Standard (or turbidity-free dilution water) and fill the measurement cuvet. Note: in order to minimize any error introduced by the cuvet, it is recommended to use, during calibration, the same cuvet you are going to use to perform the measurement.
• Insert the cuvet with the HI 93703-10 AMCO-AEPA-1 standard @10 FTU* into the measurement cell and press the CAL key again. • After approximately 50 seconds the LCD will display "----". Now the instrument is calibrated and ready for use. HOW TO ENSURE ACCURATE CALIBRATION The instructions listed below should be carefully followed during testing and during calibration: • All glassware that comes into contact with standards should be maintained clean.
STANDARD SUSPENSION Presently, there are only two recognized primary standards: AMCO-AEPA-1 and formazine. Hanna Instruments supplies HI 93703 with the AMCO-AEPA-1 which has a much longer shelf life at all concentrations (approximately six months, if free from contamination). In addition, no special handling or disposal is required and a much higher stability of suspended particles has been observed.
BATTERY REPLACEMENT All components have been selected to minimize current drain without compromising functionality. In order to minimize the battery consumption, the meter is equipped with an auto-shut off function which switches the meter off after 5 minutes of non-use. The power source is 4 x 1.5V batteries with an expected life of 60 hours, or over 900 measurements. To always grant accurate measurements, the batteries are monitored to ensure that readings are not taken when there is insufficient power .
Battery replacement must only take place in a non hazardous area using the battery types specified in this instruction manual (see page 21). To install or replace the batteries, turn the unit off and unscrew the 2 screws located on the back of the battery cover. Remove the battery cover exposing the battery compartment. Place the batteries in the compartment while paying attention to the polarity.
LCD AND ERROR CODES HI 93703 will display several different LCD codes in different situations to help the user to operate the meter. This indicates that the meter is in a ready state and measurement or calibration can be performed. This indicates that the Calibration Mode is active. If the CAL key is not pressed within 6 seconds, the meter will automatically switch to the Measurement Mode. This indicates that the Calibration Date Setting Mode is active.
This indicates a 10 FTU* standard calibration is required. This indicates the last calibration date (MM.DD). This indicates that measurement is performed. This indicates that batteries are weak and have to be replaced. When this message appears, the instrument is able to perform 50 more measurements. This indicates that batteries are too weak to perform measurements. The message appears for a few seconds, then the meter will automatically switch off.
ACCESSORIES BAT1-5AA/P 1.
WARRANTY All Hanna Instruments meters are warranted for two years against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. This warranty is limited to repair or replacement free of charge. Damages due to accidents, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument.
CE DECLARATION OF CONFORMITY Recommendations for Users Before using this product, make sure that it is entirely suitable for the environment in which it is used. Operation of this instrument in residential area could cause unacceptable interferences to radio and TV equipments, requiring the operator to take all necessary steps to correct interferences. Any variation introduced by the user to the supplied equipment may degrade the instrument's EMC performance.
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