Instruction Manual HI 96719C Magnesium Hardness ISM www.hannainst.
Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary information for the correct use of the instrument. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com. TABLE OF CONTENTS PRELIMINARY EXAMINATION .............................................................................................. 3 GENERAL DESCRIPTION ...................................................
PRELIMINARY EXAMINATION Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occurred during shipment, please notify your Dealer.
GENERAL DESCRIPTION The HI 96719 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s years of experience as a manufacturer of analytical instruments. It has the advanced optical system based on a special tungsten lamp and a narrow band interference filter that allows most accurate and repeatable readings. All instruments are factory calibrated and the electronic and optical design minimizes the need of frequent calibration.
SPECIFICATIONS Range Resolution Accuracy Typical EMC Deviation Light Source Light Detector Method Environment Battery Type Auto-Shut off Dimensions Weight REQUIRED REAGENTS Code HI 93719A-0 HI 93719B-0 HI 93719C-0 HI 96719D-0 0.00 to 2.00 mg/L 0.01 mg/L ±0.11 mg/L ±5% of reading @ 25°C ±0.02 mg/L Tungsten lamp Silicon Photocell with narrow band interference filter @ 525 nm Adaptation of the Standard Methods for the Examination of Water and Wastwater, 18th edition, EDTA colorimetric method.
PRINCIPLE OF OPERATION Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and matter. When a light beam crosses a substance, some of the radiation may be absorbed by atoms, molecules or crystal lattices.
A microprocessor controlled special tungsten lamp emits radiation which is first optically conditioned and beamed to the sample contained in the cuvette. The optical path is fixed by the diameter of the cuvette. Then the light is spectrally filtered to a narrow spectral bandwidth, to obtain a light beam of intensity Io or I. The photoelectric cell collects the radiation I that is not absorbed by the sample and converts it into an electric current, producing a potential in the mV range.
KEYPAD DESCRIPTION • ON/OFF: to turn the meter on and off. • ZERO/CFM: to zero the meter prior to measurement, to confirm edited values or to confirm factory calibration restore. • READ/ /TIMER: this is a multi-functional key. In measurement mode, press to make a measurement, or press and hold for three seconds to start a pre-programmed countdown prior to measurement. In GLP mode press to view the next screen. • CAL CHECK: this is a bi-functional key.
ERRORS AND WARNINGS The instrument shows clear messages when erroneous condition appears. Messages are also displayed when the obtained values are outside expected range. The beeper is playing a beep on errors. a) on zero reading Light High: There is too much light to perform a measurement. Please check the preparation of the zero cuvette. Light Low: There is not enough light to perform a measurement. Please check the preparation of the zero cuvette. No Light:The instrument cannot adjust the light level.
Under range: A blinking “0.00” indicates that the sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvette for reference (zero) and measurement. Over Range: A flashing value of the maximum concentration indicates an over range condition. The concentration of the sample is beyond the programmed range: dilute the sample and re-run the test. c) during calibration procedure Standard Low: The standard reading is less than expected.
Battery low: The battery must be replaced soon. Dead battery: This indicates that the battery is dead and must be replaced. Once this indication is displayed, the meter will lock up. Change the battery and restart the meter. GENERAL TIPS FOR AN ACCURATE MEASUREMENT The instructions listed below should be carefully followed during testing to ensure best accuracy.
• It is important that the sample does not contain any debris. This would corrupt the reading. • Each time the cuvette is used, the cap must be tightened to the same degree. • Whenever the cuvette is placed into the measurement cell, it must be dry outside, and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI 731318 or a lint-free cloth prior to insertion. • Shaking the cuvette can generate bubbles in the sample, causing higher readings.
• When the beeper sounds briefly and the LCD displays dashes, the meter is ready. The blinking “ZERO” indicates that the instrument needs to be zeroed first. • Fill a graduated beaker with 50 mL of sample. • Add 0.5 mL of HI 93719A-0 Magnesium indicator solution, then swirl to mix. • In the same beaker add 0.5 mL of HI 93719B-0 Alkali solution for Magnesium, then swirl to mix. • Fill two cuvettes with 10 mL of sample each.
• Remove the blank and insert the sample into the instrument and ensure that the notch on the cap is positioned securely into the groove. • Press and hold READ/ /TIMER for three seconds. The display will show the countdown prior to measurement. The beeper is playing a beep at the end of countdown period. Alternatively, wait for 30 seconds then just press READ/ /TIMER. In both cases, the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase.
Now, follow normal measurement procedure. The true value of the sample is the reading obtained multiplied by a factor of one hundred (the dilution factor). For your reference, factors to convert readings in mg/L to French degrees (FD), German degrees (DD) and English degrees (ED) of hardness are as follows: 1 mg/L = 0.1 FD = 0.056 DD = 0.07 ED INTERFERENCES Interference may be caused by excessive amounts of heavy metals.
• After a few seconds, the display will show “-0.0-”. The meter is now zeroed and ready for validation. • Remove the cuvette. • Place the CAL CHECKTM Standard HI 96719-11 Cuvette B into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. • Press CAL CHECK and the lamp, cuvette and detector icons together with “CAL CHECK” will appear on the display, depending on the measurement phase.
CALIBRATION PROCEDURE Note: It is possible to interrupt calibration procedure at any time by pressing CAL CHECK or ON/OFF keys. Warning: Do not calibrate the instrument with standard solutions other than the HANNA CAL CHECKTM Standards, otherwise erroneous results will be obtained. • Turn the meter on by pressing ON/OFF. • When the beeper sounds briefly and the LCD displays dashes, the meter is ready. The blinking “ZERO” asks for instrument zeroing.
• After a few seconds the display will show “-0.0-”. The meter is now zeroed and ready for calibration. The blinking “READ” asks for reading calibration standard. • Remove the cuvette. • Place the CAL CHECKTM Standard HI 96719-11 Cuvette B into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. • Press READ/ /TIMER and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase.
DATE INPUT • Press GLP/ to edit the desired year (2000-2099). If the key is kept pressed, the year number is automatically increased. or • When the correct year has been set, press ZERO/CFM or READ/ /TIMER to confirm. Now the display will show the month blinking. • Press GLP/ to edit the desired month (01-12). If the key is kept pressed, the month number is automatically increased. or • When the correct month has been set, press ZERO/CFM or READ/ /TIMER to confirm.
• The instrument will return automatically to measurement mode by displaying dashes on the LCD. GLP In the GLP mode, the last user calibration date can be consulted and the factory calibration can be restored. LAST CALIBRATION DATE To display the calibration date: • Press GLP/ to enter GLP mode. The calibration month and day will appear on the main display and the year on the secondary display. • If no calibration was performed, the factory calibration message, “F.
• Press READ/ /TIMER to enter in the factory calibration restore screen. The instrument asks for confirmation of user calibration delete. • Press ZERO/CFM to restore the factory calibration or press GLP/ again to abort factory calibration restore. • The instrument briefly notifies “done” when restores factory calibration and returns to measurement mode.
BATTERY REPLACEMENT To replace the instrument’s battery, follow the steps: • Turn the instrument off by pressing ON/OFF. • Turn the instrument upside down and remove the battery cover by turning it counterclockwise. • Extract the battery from its location and replace it with a fresh one. • Insert back the battery cover and turn it clockwise to close.
WARRANTY HI 96719 is warranted for two years against defects in workmanship and materials when used for its intended purpose and maintained according to the instructions. This warranty is limited to repair or replacement free of charge. Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact your dealer. If under warranty, report the model number, date of purchase, serial number and the nature of the failure.
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.
