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INSTRUCTION MANUAL
Milwaukee W
Milwaukee W
Milwaukee W
Milwaukee W ine L
Milwaukee W
Mi456
T T T T T itratable T
itratable T
itratable T
itratable T otal A
itratable T
ine L
ine L
ine L ab Minititrator
ine L
otal A
otal A
cidity
cidity
otal A
otal A cidity
cidity
cidity
www.milwaukeetesters.com
ab Minititrator
ab Minititrator
ab Minititrator
ab Minititrator
www.milwaukeetesters.com
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Summary of Contents for Milwaukee Mi456
- Page 1 Milwaukee W Milwaukee W ine L ine L ab Minititrator ab Minititrator Milwaukee W Milwaukee W Milwaukee W ine L ine L ine L ab Minititrator ab Minititrator ab Minititrator Mi456 T T T T T itratable T itratable T...
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Page 2: Table Of Contents
Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis TABLE OF CONTENTS FUNCTIONAL DESCRIPTION ................3 GENERAL DESCRIPTION ..................4 PRINCIPLE OF OPERATION .................. 6 SPECIFICATIONS ....................7 STARTUP ......................8 GUIDE TO DISPLAY CODES ................. 8 GENERAL TIPS FOR AN ACCURATE MEASUREMENT ..........11 PUMP CALIBRATION PROCEDURE .............. -
Page 3: Functional Description
www.milwaukeetesters.com FUNCTIONAL DESCRIPTION FRONT PANEL A. TITRANT BOTTLE B. LIQUID CRYSTAL DISPLAY (LCD) C. KEYPAD D. ELECTRODE HOLDER REAR PANEL pH ELECTRODE TEMPERATURE PROBE G. PERISTALTIC PUMP TUBE H. BEAKER PERISTALTIC PUMP TEMPERATURE PROBE CONNECTOR K. BNC ELECTRODE CONNECTOR FUSE M. -
Page 4: General Description
25 °C 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. - Page 5 www.milwaukeetesters.com SIGNIFICANCE OF USE Acids occur naturally during the growing of grapes and as part of the fermentation process. Wines show lower levels of acid when there are hot growing seasons or when the grapes come from hotter regions. In the proper proportion, acids are a desirable trait and give the wine character. The three predominant acids in wine are tartaric, malic and citric, all of which are intrinsic to the grape.
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Page 6: Principle Of Operation
Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis 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 7: Specifications
www.milwaukeetesters.com 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 Automatic from 0.0 to 100.0 °C Compensation pH Electrode... -
Page 8: Startup
Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis STARTUP • Place the instrument on a flat table. Do not place the instrument on direct sun light. • Connect the titrator to mains socket with ground connection and the correct voltage and frequency. - Page 9 www.milwaukeetesters.com 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 10 Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis This prompt appears for a few seconds before returning to the main screen, when the pH calibration is done. The “WRONG” “ ” / “WRONG” “ ” tags alternatively blinking appear when the buffer solution is not correct or when the probe is wrong.
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Page 11: General Tips For An Accurate Measurement
www.milwaukeetesters.com GENERAL TIPS FOR AN ACCURATE MEASUREMENT The instructions listed below should be carefully followed during testing to ensure best accuracy. • Purge the peristaltic pump to have fresh titrant when starting a new analysis or calibration. • Calibrate the peristaltic pump before performing an analysis. •... - Page 12 Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis • Immerse the pH and the temperature probe approximately 2 cm (0.8“) into the sample to be tested while paying attention to not touch the stir bar. • Insert the dosing tip in the appropriate holder place and pay attention to not be immersed into solution.
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Page 13: Ph Calibration Procedure
www.milwaukeetesters.com pH CALIBRATION PROCEDURE The pH calibration must be performed each time the pH electrode is changed. • Turn the instrument ON using the power switch from the rear panel of the instrument. • Fill the 50 mL beaker up to the 50 mL mark with Buffer Solution 1 (7.00 pH) or Buffer Solution 2 (8.20 pH). -
Page 14: Measurement Procedure
Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis MEASUREMENT PROCEDURE Warning: Make sure the instrument has been calibrated (pH and pump calibration) before performing a wine sample analysis. • Use the 2000 μL automatic pipette to add exactly 2 mL of wine sample to the 50 mL beaker. -
Page 15: Pump Tube Replacement
www.milwaukeetesters.com • 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 buffer on the secondary display. • At the end of the titration, the Total Titratable Acidity concentration is displayed in g/L. -
Page 16: Fuse Replacement
Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis 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. - Page 17 1 hour. Follow the Storage Procedure above. CLEANING PROCEDURE • Wine deposits Soak in Milwaukee MA9016 cleaning solution for 1 hour • Wine stains Soak in Milwaukee MA9016 cleaning solution for 1 hour IMPORTANT: After performing any of the cleaning procedures, rinse the electrode thor- oughly with distilled water, refill the reference chamber with fresh electrolyte and soak the electrode in MA9015 Storage Solution for at least 1 hour before taking measurements.
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Page 18: Accessories
Instruction Manual Mi456 TITRATABLE TOTAL ACIDITY Minititrator for wine analysis ACCESSORIES REAGENT SETS MA9015 Electrode storage solution (220 mL) MA9016 Cleaning solution (220 mL) MA9011 Electrode filling solution (230 mL) Mi456KIT Reagent set Mi556-001 Calibration standard (100 mL) Mi556-002 Titrant solution (100 mL) Mi556-003 Buffer solution 1 pH 7.00 (100 mL) - Page 19 Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered by the warranty. Milwaukee/Martini instruments reserves the right to make improvements in design, construction and appearance of its products without advance notice.
- Page 20 THANK YOU FOR CHOOSING Sales and Technical Service Contacts: Milwaukee Electronics Kft. Alsókikötő sor 11. 6726, Szeged, Hungary Tel: +36-62-428-050 Fax: +36-62-428-051 e-mail: sales@milwaukeeinst.com Milwaukee Instruments, Inc. 2950 Business Park Drive Rocky Mount, NC 27804 USA Tel: +1 252 443 3630 Fax: +1 252 443 1937 e-mail: sales@milwaukeetesters.com...