Instruction Manual HI 88703 Turbidity Meter w w w. h a n n a i n s t .
Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using this instrument. This manual will provide you with the necessary information for correct use of this instrument, as well as a precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com or view our worldwide contact list at www.hannainst.com.
TABLE OF CONTENTS WARRANTY .......................................................................................................................... 2 PRELIMINARY EXAMINATION................................................................................................. 4 GENERAL DESCRIPTION ........................................................................................................ 4 ABBREVIATIONS ................................................................................................
PRELIMINARY EXAMINATION Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occurred during shipment, please notify your local Hanna Office.
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.
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.
FUNCTIONAL DESCRIPTION INSTRUMENT DESCRIPTION 1) 2) 3) 4) 5) 6) 7) 8) Liquid Crystal Display (LCD). The LCD has backlight for better visibility in dark environments. Keypad. Splash proof resistant. Cuvette Lid. Close the cuvette lid prior to start a measurement.
DISPLAY DESCRIPTION The display contains the following fields: 1 1) 2) 3) 4) 5) 6) 6 2 5 3 4 The current time in selected format Information related to the measurement Functional keys Currently selected parameters Measuring units 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.
SPECIFICATIONS Range - non ratio mode Resolution - non ratio mode Range - ratio mode Resolution - ratio mode Range selection Accuracy Repeatibility Stray Light Light Detector Method Measuring mode Turbidity Standards Calibration Light Source Lamp life Display LOG Memory Serial Interface Environment Power supply Auto Shut-off Dimensions Weight 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 0.01; 0.1 NTU 0.1; 1 Nephelos 0.01 EBC 0.00 to 9.99; 10.0 to 99.
GENERAL TIPS FOR AN ACCURATE MEASUREMENT HI 88703 is a highly accurate meter for turbidity. 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.
If the cuvette is not indexed, put the cuvette with the factory mark aligned with the sign on the instrument top. 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 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.
For indexing one cuvette or matching multiple cuvettes, the continuous reading mode is suggested. In this mode multiple successive readings are taken without turning off the lamp. The turbidity is immediately displayed, reducing considerably the measurement time. Note: The instrument can not perform continuous readings if the average mode is on. In order to index a cuvette follow the next steps: • Fill the cuvette with high quality water (<0.1 NTU) up to the 10 mL mark.
• Mark this position on the thicker white band on the top of the cuvette with a water resistant pencil. • Always use this position to align it with the sign on the instrument top. MATCHING MULTIPLE CUVETTES Precise measurements require the use of a single cuvette. If it is not possible, cuvette selection and matching must be performed before taking measurements. In order to match multiple cuvettes follow the next steps: • Fill some cuvettes with high quality water (<0.1NTU) up to the 10 mL mark.
• Insert the second cuvette into the instrument and take a reading. • 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 the Read key pressed and, after the first value is displayed, open the lid and start rotating the cuvette until the read value matches the first cuvette.
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. APPLICATION OF VACUUM Vacuum works by decreasing the atmospheric pressure. In this way the bubbles from the solution came out to the surface. Application of vacuum is a very simple procedure and can be applied with any vacuum source at hand.
HEATING THE SAMPLE Use of heat to remove air bubbles, although very effective in some cases, should be handled with care because it can alter the turbidity of the sample. When heating a sample, the volatile components from the sample can vaporize, the suspended components can dissolve or the sample characteristics can change. Therefore, the heating procedure should be used with extreme care. The best way is to use a warm water bath and immerse the cuvette with sample into the bath.
RANGE SELECTION The HI 88703 instrument has two measuring ranges: Ratio Turbidity, Non Ratio Turbidity. When the instrument is in the main screen, the selected range is displayed in the right side of the LCD, on the message line. To change the range, press the RANGE key. When the display shows the Change parameter screen, press s or t keys until the new range is highlighted. Press the CFM key to select the new range. The instrument returns to the main screen.
HELP MODE The HI 88703 offers an interactive context help mode that assists the user at any moment. To access help screens, just press HELP. Depending which menu you are in, a screen with additional information will appear. To read all available data, scroll down or up the text using the s or t keys. Press the Support key to access a page with Hanna support centers and their contact details. Press the Accessories key to access a page with instrument accessories.
• Wipe the cuvette thoroughly with a lint-free cloth to remove any fingerprints, dirt or water spots. • Apply silicone oil on the cuvette and wipe with a lint-free cloth to obtain an even film over the entire surface of the cuvette. Note: It is very important to oil the cuvette, especially for low turbidity values (< 1 NTU) to hide the glass imperfections which can influence the reading. • Place the cuvette into the instrument.
• Press the Read key and keep it pressed to take continuous readings. The display will show “READ” in the left side and blinking dashes. The dashes and lamp icon will appear during different measurement phases. The first value is displayed after 10 seconds and then a new reading is displayed each second as long as the Read key is kept pressed. When a new value is displayed, the measurement value will briefly blink. The last value remains on the display after the Read key is released.
EPA MODE To round the readings as EPA specifications press the EPA key. The “EPA” text is displayed on the left side of the LCD and the reading is rounded as follows: NTU Round to Nearest 0.0-1.0 0.05 1-10 0.1 10-40 1 40-100 5 100-400 10 400-1000 50 >1000 100 CALIBRATION PROCEDURE FOR RATIO / NON RATIO TURBIDITY RANGE HI 88703 has a powerful calibration function that compensates for lamp aging or changing.
FORMAZIN PREPARATION In order to prepare formazin 4000 NTU stock solution, follow the next procedure: Solution I : Dissolve 1.000 grams of hydrazine sulfate, (NH2)2 H2SO4, in distilled, deionized water and dilute to 100 mL in a volumetric flask. Warning: Handle hydrazine sulfate with care because it is a carcinogen reagent. Avoid inhalation, ingestion, or skin contact. Formazin solution can also contain some hydrazine traces. Solution II : Dissolve 10.
Note: The reading of the first point colud be skipped by pressing the Skip key. In this case, the 0.00 NTU point will be used for calibration. • Place the <0.1 NTU standard cuvette (or the cuvette with dilution water) into the holder and ensure that the cuvette mark is aligned with the sign on the instrument top. • Close the lid and press the Read key. The display will show the value blinking and the lamp icon during measurement.
THREE-POINT CALIBRATION (Ratio Turbidity only) To perform a three-point calibration, continue the procedure with the following steps: • Remove the second standard cuvette. • Place the 100 NTU standard cuvette (or the third prepared formazin standard) into the holder, with the cuvette mark aligned to the sign on the instrument top. • Close the lid and press the Read key. The display will show the value blinking and the lamp icon during measurement.
FIVE-POINT CALIBRATION (Ratio Turbidity only) To perform a five-point calibration, continue the procedure with the following steps: • Remove the fourth standard cuvette. • Place the 2000 NTU standard cuvette (or the fourth prepared formazin standard) into the holder, with the cuvette mark aligned to the sign on the instrument top. • Close the lid and press the Read key. The display will show the value blinking and the lamp icon during measurement.
GOOD LABORATORY PRACTICE (GLP) The HI 88703 has built in complete GLP information. The calibration date and the calibration points are displayed in a comprehensive mode for each range. To display the GLP information, simply press CAL key. A screen with instrument serial number and with information about the calibration is displayed. For further information, press the GLP key. The GLP contains: • Instrument serial number • The last user calibration date, in selected format and time in hh.mm format.
LOG AND LOG RECALL The HI 88703 has a powerful log function that could store up to 200 records. Each record contains: • the measuring range, • the reading value, • the measuring units, • the date and time of the measurement, • the current log number. Notes:• The log can be saved only after a measurement is completed. • A measurement can be saved only once. LOG SAVE To log a record, simply press LOG key after the measurement is completed. A record number is assigned to each logged measurement.
SETUP In the Setup mode, the instrument’s parameters, can be changed. Some parameters affect the measuring sequence and others are general parameters that change the behaviour or appearence of the instrument. The setup mode may be accessed from the main screen by pressing the SETUP key. Press ESC or SETUP to return to the main screen. A list of setup parameters will be displayed with currently configured setting. Press HELP for aditional information.
Date / Time This option is used to set the instrument’s date and time. Press the Modify to change the date/time. Press the ⊳ u functional keys to highlight the value to be modified (year, month, day, hour, minute or second). Use the s or t keys to change the value. Press the Accept key to confirm or ESC to return to the setup without saving the new time or date . Time format Option: AM/PM or 24 hours. Press the functional key to select the new value.
Instrument ID Option: 0 to 9999. This option is used to set the instrument’s ID (identification number). The instrument ID is used while exchanging data with a PC. Press the Modify key to access the instrument ID screen. Press the s or t keys in order to set the desired value. Press the Accept key to confirm the value or ESC to return to the setup menu without saving the new value.
FUSE REPLACEMENT To change the fuse follow next steps: •Disconnect the power cord from the rear panel of the instrument. •Pull out the fuse holder located near the power cord connector. •Replace the fuse with a similar one. •Push the fuse holder with the fuse in the appropriate place. PC INTERFACE Log data download from the instrument to the PC can be done with the HI 92000 Windows compatible software (optional). HI 92000 also offers graphing and on-line help features.
Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Technical Support for Customers Tel. (800) 426 6287 Fax (401) 765 7575 E-mail tech@hannainst.com www.hannainst.
