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Summary of Contents for Milwaukee MI456 PRO
- Page 1 INSTRUCTION MANUAL MI456 PRO Titratable Total Acidity Mini Titrator for Wine Analysis SATISFACTION GUARANTEED...
- Page 2 This instruction manual will provide you the necessary information for correct use of the meter. All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Milwaukee Instruments Inc., Rocky Mount, NC 27804 USA.
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Page 3: Table Of Contents
TABLE OF CONTENTS 1. FUNCTIONAL DESCRIPTION ............................4 2. GENERAL DESCRIPTION .............................6 3. PRINCIPLE OF OPERATION ............................8 4. SPECIFICATIONS ................................9 5. STARTUP ...................................10 6. GUIDE TO DISPLAY CODES ............................10 7. GENERAL TIPS FOR AN ACCURATE MEASUREMENT .................13 8. PUMP CALIBRATION PROCEDURE ........................14 9. -
Page 4: Functional Description
25 °C L. CALIBRATION MODE INDICATOR Keypad MI456 PRO Titratable Total Acidity Mini Titrator A. PUMP - to start/stop the pump B. CAL - to enter pump or pH calibration mode C. - Page 5 FUNCTIONAL DESCRIPTION 5 Front Panel A. TITRANT BOTTLE B. LIQUID CRYSTAL DISPLAY (LCD) C. KEYPAD D. ELECTRODE HOLDER Rear Panel E. pH ELECTRODE J. TEMPERATURE PROBE CONNECTOR F. TEMPERATURE PROBE K. BNC ELECTRODE CONNECTOR G. PERISTALTIC PUMP TUBE L. FUSE H.
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Page 6: General Description
The MI456 is a low-cost, easy to use, microprocessor-based automatic titrator. It has a simple and reliable peristaltic pump that ensure high dosing repeatability. By performing pump calibration with the provided Milwaukee standards, the instrument accuracy is assured. The instrument comes with a preprogrammed analysis method designed for Total Titratable Acidity measurements on wine. - Page 7 GENERAL DESCRIPTION 7 Proper acidity in wine is what makes it refreshing and an ideal accompaniment to food. The proper acid level of a wine varies, with sweeter wines generally requiring somewhat higher levels to retain the proper balance. For dry table wine the acceptable range is usually 0.60 to 0.75%;...
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Page 8: Principle Of Operation
8 MI456 Mini Titrator for Wine Analysis 3. PRINCIPLE OF OPERATION The determination of total acids in wine is made according to a neutralization reaction, that is the reaction between the acids found in wine and a base. This type of reaction forms the basis of titration methods of analysing acids. -
Page 9: Specifications 9
SPECIFICATIONS 9 4. SPECIFICATIONS Range 0.0 to 25.0 g/L of tartaric acid Resolution 0.1 g/L Accuracy 5% of reading Method Acid-base titration method Principle End-point titration pH Calibration One-point in selected end-point: 7.00 pH or 8.20 pH Sample volume 2 mL Temperature Compensation Automatic from 0.0 to 100.0 °C pH Electrode MA919B/1 (included) -
Page 10: Startup
10 MI456 Mini Titrator for Wine Analysis 5. STARTUP y Place the instrument on a flat table. Do not place the instrument on direct sun light. y Connect the titrator to mains socket with ground connection and the correct voltage and frequency. - Page 11 GUIDE TO DISPLAY CODES 11 Pump Calibration Messages This screen appears each time the meter enters pump or pH calibration mode by pressing the CAL button. The meter is ready to start pump calibration by pressing the PUMP button. The meter returns to the main screen by pressing the CAL button.
- Page 12 12 MI456 Mini Titrator for Wine Analysis pH Calibration Messages This screen appears each time the meter enters pump or pH calibration mode by pressing the CAL button. This screen appears when the pH calibration is started by pressing the pH button. Pressing again pH or the CAL button, the pH calibration is aborted and the instrument returns to the main screen.
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Page 13: General Tips For An Accurate Measurement 13
GENERAL TIPS FOR AN ACCURATE MEASUREMENT 13 pH End Point Setup Messages This screen appears when the meter is in main screen and the pH button is pressed. Press the CAL button in order to change the end-point. Each time the pH button is pressed the end point value is changed and the meter returns to the main screen. -
Page 14: Pump Calibration Procedure
14 MI456 Mini Titrator for Wine Analysis 8. PUMP CALIBRATION PROCEDURE Warning: The calibration of the pump must be performed each time the pump tube, the reagent bottle or the pH electrode is changed. It is recommended to perform the pump calibration before each set of measurements. -
Page 15: Ph Calibration Procedure 15
pH CALIBRATION PROCEDURE 15 y After sample preparation, press the CAL button to enter the pump calibration mode. The CAL tag will start blinking. y Press PUMP in order to start the pump calibration. y At the end of the calibration, “done” appears for a few seconds and the meter returns to the measurement mode. -
Page 16: Measurement Procedure
16 MI456 Mini Titrator for Wine Analysis 10. MEASUREMENT PROCEDURE Warning: Make sure the instrument has been calibrated (pH and pump calibration) before performing a wine sample analysis. y Use the 2000 L automatic pipette to add exactly 2 mL of wine sample to the 100 mL beaker. -
Page 17: Pump Tube Replacement 17
PUMP TUBE REPLACEMENT 17 y Press the START STOP button to start the titration. The display will show “----” during titration, along with stirrer and pump tags blinking on the LCD, and 7.00 or 8.20 pH bu er on the secondary display. y At the end of the titration, the Total Titratable Acidity concentration is displayed in g/L. -
Page 18: Fuse Replacement
18 MI456 Mini Titrator for Wine Analysis 12. FUSE REPLACEMENT To change the fuse follow next steps: y Disconnect the power cord from the rear panel of the instrument. y Pull out the fuse holder located near the power cord connector. y Replace the fuse with a similar one. -
Page 19: Electrode Conditioning & Maitenance 19
ELECTRODE CONDITIONING & MAITENANCE 19 13. ELECTRODE CONDITIONING & MAITENANCE Preparation Procedure Remove the protective cap of the pH electrode (MA919B/1). Do not be alarmed if salt deposits are present. This is normal with electrodes. They will disappear when rinsed with water. During transport, tiny bubbles of air may form inside the glass bulb a ecting proper functioning of the electrode. - Page 20 Allow the electrode to stand upright for 1 hour. Follow the Storage Procedure above. CLEANING PROCEDURE y Wine deposits: Soak in Milwaukee MA9016 cleaning solution for 1 hour y Wine stains: Soak in Milwaukee MA9016 cleaning solution for 1 hour...
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Page 21: Accessories
ACCESSORIES 21 14. ACCESSORIES Reagent Sets MA9011 Electrode filling solution (230 mL) MA9015 Electrode storage solution (230 mL) MA9016 Cleaning solution (230 mL) MI556-001 Calibration standard (100 mL) MI556-002 Titrant solution (100 mL) MI556-003 Bu er solution 1 pH 7.00 (100 mL) MI556-004 Bu er solution 2 pH 8.20 (100 mL) Other Accessories... -
Page 22: Certification
If service is required, contact your local Milwaukee Instruments Technical Service. If the repair is not covered by the warranty, you will be notified of the charges incurred. When shipping any meter, make sure it is properly packaged for complete protection. - Page 23 Milwaukee Instruments reserves the right to make improvements in design, construction and appearance of its products without advance notice.
- Page 24 THANK YOU FOR CHOOSING Milwaukee Instruments, Inc. 2950 Business Park Drive Rocky Mount, NC 27804 USA tel: +1 (252) 443-3630 fax: +1 (252) 443-1937 www.milwaukeeinstruments.com e-mail: sales@milwaukeeinstruments.com Distributor in Australia Pacific Sensor Technologies Pty Ltd Unit 4, 3 Neutron Place Rowville, VIC 3178 Australia 1300 662 720 | sales@pacificsensortech.com.au...