Milwaukee Mi-456 - Manual

9

Mi 456 - Mini-titrator

for the determination of TITRATABLE TOTAL ACIDITY for wine analysis

Mi456 is a user-friendly microprocessor-based mini-titrator for the determi-

nation of the titratable total acidity in the process of wine making. This mini-

titrator gives you direct readings in g/L of tartaric acid, with a range of 0.0

to 25.0 g/L.

The instrument comes with a pre-programmed analysis method for the

titratable total acidity measurements on wine sample.

Also called TA and sometimes total acidity, titratable acidity is the sum of the

fixed and volatile acids present in a wine. This is determined by a chemical

process called titration. The titratable acidity is usually expressed in terms of

tartaric acid, even though the other acids are also measured. Titratable acidi-

ty is expressed either as a percentage or as grams per liter. For example, 0.7%

TA is the same as 7 grams per liter (or 7 g/l) TA.

Acidity in the must will result in a poor fermentation and a slightly medicinal

and flat taste. Too much acid will give the wine an unpleasant sourness or

tartness. Some acid is necessary for fermentation, and up to one-fourth of

the initial acid content will be consumed by the yeast during fermentation.

Low-acid musts are usually corrected by adding tartaric acid (the princi-

ple acid in grapes), malic acid, citric acid, or acid blend. An acid testing

kit is indispensable in measuring initial acidity.

Glass electrode & Temp Probe

pH electrodes and Temperature Probe are
supplied with the Mi456.

Accessories

Mi556-001 Calibration standard TA (100 mL bottle)

Mi556-002 Titrant TA (100 mL bottle)

Mi556-003 Buffer pH 7.0 (100 mL bottle)

Mi556-004 Buffer pH 8.2 (100 mL bottle)

MA919B/1 pH Electrode

MA831R

Temperature probe

MA9011

Refilling Electolyte Solution 3.5M KCl,

for ORP electrodes, 230 mL bottle

Mi0009

Small stir bars (5 pcs)

Mi0020

50 mL beaker (4 pcs)

Mi0022

2000 µL pipette (1 pc)

Mi0023

Pipette tips for 2000 µL pipette (4 pcs)

www.milwaukeetesters.com

Mi456

T itratable Total Acidity

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

1 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)

Temperature Probe

MA831R (included)

Pump Volume

0.5 mL/min

Stirring Speed

1500 rpm

Environment

0 to 50°C; max RH 95%

Power Supply

220V/50 Hz; 10VA

Dimensions

208 x 214 x 163 mm

Weight 2.2

Kg

Ordering Information

Mi456 is supplied complete with:

Calibration standard TA, Titrant TA, Buffer pH 7.0, Buffer pH 8.2,

MA919B/1 pH Electrode, MA831R Temperature probe,

MA9011Refilling Electolyte Solution 3.5M KCl, for pH electrodes

230 mL bottle, small stir bar, 2 x 50 mL beakers, 2000 µL pipette,

test tube set, O-ring, 1 mL syringe, power cable and instruction

manual.