Hanna Instruments HI96750C Instruction Manual

Potassium low range & medium range ism

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HI96750C

Potassium Low Range & Medium

Range ISM

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Page 1 HI96750C Potassium Low Range & Medium Range ISM...
Page 2 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. All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895, USA.
Page 3: Table Of Contents
PRELIMINARY EXAMINATION .................... GENERAL DESCRIPTION ....................ABBREVIATIONS ......................SPECIFICATIONS ......................PRECISION AND ACCURACY ....................PRINCIPLE OF OPERATION ....................FUNCTIONAL DESCRIPTION ....................ERRORS AND WARNINGS ....................GENERAL TIPS FOR AN ACCURATE MEASUREMENT ............. STARTUP ........................RANGE SELECTION......................MEASUREMENT PROCEDURE .................... VALIDATION PROCEDURE ....................CALIBRATION PROCEDURE ....................
Page 4 Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occurred during shipment, please contact your local Hanna Instruments Office. Each HI96750 Ion Selective Meter is supplied complete with: • Sample Cuvettes and Caps (2 pcs.) •...
Page 5 The validation procedure is extremely user friendly. Just use the exclusive Hanna Instruments ready‑made, NIST traceable standards to verify the performance of the instrument and recalibrate if necessary.
Page 6: Specifications
SPECIFICATIONS 0.0 to 10.0 mg/L LR Range 10 to 100 mg/L MR Resolution 0.1 mg/L Accuracy LR: ±1.5 mg/L ±7 % of reading MR: ±15 mg/L ±7 % of reading @25 °C (77 °F) Light Source Light Emitting Diode Light Detector Silicon Photocell with narrow band interference filter @466 nm Tetraphenylborate method.
Page 7 The optical system of Hanna Instruments’ HI96750 colorimeter is based on special LED and narrow‑...
Page 8 A microprocessor controlled special LED 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 I or I.
Page 9 INSTRUMENT DESCRIPTION 1) RANGE/GLP 2) CAL CHECK key 3) ZERO/CFM key 4) READ /TIMER key 5) ON/OFF key 6) Liquid Crystal Display (LCD) 7) Cuvette alignment indicator 8) Cuvette holder KEYPAD DESCRIPTION • ON/OFF: to turn the meter on and off. •...
Page 10 OPERATING MODES • Measurement mode: default operation mode, enables both validation and measurement. • Calibration mode: may be entered by keeping CAL CHECK pressed for three seconds (the “CAL” tag appears), it enables calibration of the instrument. • GLP mode: may be entered by pressing RANGE/GLP for 3 seconds (“GLP”...
Page 11 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.
Page 12: Errors And Warnings
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. Standard High: The standard reading is higher than expected.
Page 13 The instructions listed below should be carefully followed during testing to ensure best accuracy. • Color or suspended matter in large amounts may cause interference, therefore these should be removed by treatment with active carbon and by prior filtration. • For a correct filling of the cuvette: the liquid in the cuvette forms a concavity on the top; the bottom of this concavity must be at the same level of the 10 mL mark.
Page 14 • 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 HI731318 or a lint‑free cloth prior to insertion. • Shaking the cuvette can generate bubbles in the sample, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.
Page 15: Startup
HI96750 can measure 0.0‑10.0 mg/L Potassium when range P1 is selected and 10‑100 mg/L Potassium when range P2 is selected. Note: Sample dilution is required when the P2 Potassium MR is selected. To change the range follow the procedure: • Turn the meter on by pressing ON/OFF. The display briefly shows all tags on. •...
Page 16: Measurement Procedure
The measurement procedure requires the instrument to be zeroed prior to sample measurement. The instrument is “zeroed” using an unreacted sample to compensate for the sample turbidity or color. The reagents are then added and the reacted sample is measured. •...
Page 17 • After a few seconds, the display will show “-0.0-”. The meter is now zeroed and ready for measurement. • Remove the cuvette. • Add the content of one packet of HI93750B‑0 powder reagent. Replace the cap and shake gently 1 minute. •...
Page 18 P2 Potassium MR for 10-100 mg/L Dilute the sample 1:10 by following the procedure below • Use the 5 mL syringe twice to measure 10 mL of sample. • To measure exactly 10 mL of sample with the 5 mL syringe, push the plunger completely into the syringe and insert the tip into the sample.
Page 19: Validation Procedure
Use the validation procedure to ensure that the instrument is properly calibrated. Warning: Do not validate the instrument with any standard solutions other than the Hanna Instruments CAL Check Standards, otherwise erroneous results will be obtained. Note: The validation is performed only for the selected parameter. For full validation of the instrument, the following procedure must be performed for each parameter.
Page 20: 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 Instruments CAL Check Standards, otherwise erroneous results will be obtained. When calibrating, only the selected range is affected.
Page 21 • Place the CAL Check Standard HI96750‑11 Cuvette A into the cuvette holder and ensure that the notch on the cap is positioned securely into the groove. • Press ZERO/CFM and the lamp, cuvette and detector icons will appear on the display, depending on the measurement phase.
Page 22 • After measurement the instrument will show for three seconds the CAL Check Standard value. Note: If the display shows “STD HIGH”, the standard value was too high. If the display shows “STD LOW”, the standard value was too low. Verify that both CAL Check Standards HI96750-11 Cuvettes, A and B are free from fingerprints or dirt and that they are inserted correctly.
Page 23 • Press RANGE/GLP to edit the desired month (01‑12). If the key is kept pressed, the month number is automatically increased. • When the correct month has been set, press ZERO/CFM or READ /TIMER to confirm. Now the display will show the day blinking. •...
Page 24 In the GLP mode, the last user calibration date can be verified and the factory calibration can be restored. LAST CALIBRATION DATE To display the calibration date: • Press and hold RANGE/GLP for 3 seconds to enter GLP mode. The calibration month and day will appear on the main display and the year on the secondary display.
Page 25 • Press ZERO/CFM to restore the factory calibration or press RANGE/GLP again to abort factory calibration restore. • The instrument briefly indicates “donE” upon restoration factory calibration prior to returning to measurement mode. To save battery, the instrument shuts down after 10 minutes of non‑use in measurement mode and after 1 hour of non‑use in calibration mode.
Page 26: Accessories
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. •...
Page 27 To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. Hanna Instruments reserves the right to modify the design, construction or appearance of its products without advance notice.
Page 28 World Headquarters Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA www.hannainst.com Local Office Hanna Instruments USA 270 George Washington Highway Smithfield, RI 02917 Phone: 800.426.6287 Fax: 401.765.7575 e‑mail: tech@hannainst.com Printed in ROMANIA MAN96750...

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