Milwaukee MI455 Manual de usuario

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Milwaukee Wine Line L

ine Line L

ine Lab Minititratorab Minititrator

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Mi455

Free & Tree & T

ree & Tree & T

ree & Total Sulphur Dioxideotal Sulphur Dioxide

otal Sulphur Dioxideotal Sulphur Dioxide

otal Sulphur Dioxide

INSTRUCTION MANUAL

Instruction Manual Mi455 FREE & TOTAL SULPHUR DIOXIDE Minititrator for wine analysis

FUNCTIONAL DESCRIPTION ............................................................................... 3

GENERAL DESCRIPTION ..................................................................................... 4

PRINCIPLE OF OPERATION .................................................................................. 6

SPECIFICATIONS ............................................................................................... 7

STARTUP ........................................................................................................... 8

GUIDE TO DISPLAY CODES ................................................................................. 9

GENERAL TIPS FOR AN ACCURATE MEASUREMENT ............................................... 11

PUMP CALIBRATION PROCEDURE ...................................................................... 11

FREE SO2MEASUREMENT PROCEDURE ............................................................... 13

TOTAL SO2MEASUREMENT PROCEDURE ............................................................. 14

PUMP TUBE REPLACEMENT ................................................................................ 15

FUSE REPLACEMENT ......................................................................................... 16

ELECTRODE CONDITIONING AND MAINTENANCE ............................................. 16

ACCESSORIES ................................................................................................. 18

TABLE OF CONTENTS

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FUNCTIONALDESCRIPTION

FRONT PANEL

A. TITRANT BOTTLE

B. LIQUID CRYSTAL DISPLAY (LCD)

C. KEYPAD

D. ELECTRODE HOLDER

DISPLAY

A. HOURGLASS ICON

B. BATTERY STATUS ICON

C. ERROR MESSAGE

D. MEASURE STATUS

E. CALIBRATION MODE INDICATOR

F. MAIN DISPLAY

G. MEASUREMENT UNIT

H. TIMER MODE INDICATOR

I. SECONDARY DISPLAY

REAR PANEL

E. ORP ELECTRODE

F. PERISTALTIC PUMP TUBE

G. BEAKER

H. PERISTALTIC PUMP

I. BNC ELECTRODE CONNECTOR

J. FUSE

K. POWER CABLE CONNECTOR

L. POWER SWITCH

Instruction Manual Mi455 FREE & TOTAL SULPHUR DIOXIDE Minititrator for wine analysis

GENERAL DESCRIPTION

The Mi455 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 pre-programmed analysis method designed for Free and

Total Sulphur Dioxide measurements on wine samples. The instrument has a powerful

and effective built-in algorithm to analyze the shape of the electrode response and to

determine the reaction completion. This algorithm automatizes the analysis, makes all

the necessary calculations and assures a simple and effective interface for the user.

By simply pressing the START STOP button, the instrument will automatically make the

titration up to the equivalence point. The result is immediately displayed in convenient

units, then the instrument is ready for another titration.

SIGNIFICANCE OF USE

An important reason for adding SO2 is to avoid oxidation. When there is oxygen around,

SO2itself becomes oxidized before phenol compounds in the wine , and so acts as an oxygen

scavenger. Also SO2 suppresses the activity of enzymes that cause browning and other

problems.

What is really protecting your wine is molecular SO2. When you add SO2, depending of

circumstances, some of it immediately becomes bound. The relationship between the

amount of added SO2and the amount of SO2remaining free is complex. It is clear,

however, that it is largely governed by the total SO2content of the wine. The rate of binding

decreases as the free SO2concentration increases. The exact relationship between free

and bound (total - free) SO2will vary from wine to wine.

Below 30-60 ppm, 33% to 50% of SO2addition becomes bounded. What remains is

called “free” and it is divided in two parts. The larger, and relatively ineffective free part is

KEYPAD

A. PUMP - to start/stop the pump

B. CAL - to enter pump calibration mode

C. STIR - to start/stop the stirrer while in

measurement or purging mode

D. START STOP - to start/stop titration or

pump calibration

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“bisulphite” (HSO3-). The smaller part of the free is the active molecular SO2. The amount

of molecular SO2in your wine depends both on the level of free SO2present as well as pH.

For instance, at pH 3.2, the amount of free SO2for 0.8 ppm molecular SO2is 22 ppm. At

pH 3.5, you will need 43 ppm free - essentially double.

This meter is supplied with:

• Reagents set for 20 titrations

• Two 50 mL beakers

• Two 20 mL beakers

• Tubes set with cap

• ORP probe

• Stir bar

• Power cable

• One 230 mL bottle of Refill Solution

• One 1 mL syringe

• Instruction manual

• Warranty code

Note: Save all packing material until you are sure that the instrument works correctly.

Any defective item must be returned in its original packing.

Free SO2concentration (ppm) for 0.8 ppm molecular SO2:

In most situations, 0.8 ppm molecular SO2during bulk storage and at bottling will provide

you with adequate protection from oxidation and bacterial action. This includes prevention

of malolactic bacteria as well.

It is important to remember that the amount of free SO2in the wine depends on three

things: how much is added, how much was present before the addition and how much of

your addition promptly becomes bound.

The level at which molecular SO2can be detected by the human senses is about 2.0 ppm.

This is also the level which is needed for maximum protection of your wine. This is

particularly true in the case of sweet, and most notably, botrytised wines.

The Milwaukee Mi455 offers the possibility to test free or total SO2in all the wines

including the red ones, that are difficult to test with manual methods because the color

changes are hardly seen.

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Instruction Manual Mi455 FREE & TOTAL SULPHUR DIOXIDE Minititrator for wine analysis

PRINCIPLE OF OPERATION

Determination of sulphur dioxide in wine samples is made by titration of the sulphur

dioxide present in wine with iodate. In this procedure an excess of iodine is added to the

wine sample and it is titrated with iodate.

For precise results it is very important to know the exact sample volume, titrant volume and

concentration.

The peristaltic pump has a good repeatability but the dosing volume depends on many

factors as the diameter of the tube or the tube stretching. To compensate for all this errors,

the pump need to be calibrated. The calibration of the pump is also needed in order to have

high precision of the titrations.

The calibration procedure is in fact the analysis of a known solution. By doing this, the

instrument makes a differential analysis between the standard and the wine sample. The

pump volumetric debit and the real concentration of the titrant is compensated. Only the

sample volume has to be precisely known.

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This instrument is in compliance with CE Directives.

SPECIFICATIONS

Range 0 to 400 ppm SO2

Resolution 1 ppm

Accuracy 5% of reading

Method Ripper titrimetric method

Principle Equivalence point redox titration

Sample volume 50 mL

ORP Electrode MA924B/1 (included)

Pump debit 0.5 mL/min

Stirring speed 1500 rpm

Environment 0 to 50 °C (32 to 122 °F) ; max 95% RH non-condensing

Power supply 220V/50Hz; 10VA

Dimensions 208 x 214 x 163 mm (8.2 x 8.4 x 6.4") (with beaker)

Weight 2200 g (77,6 oz.).

Required Reagents

Code Description Quantity/test

Mi555-001 Standard (for Free & Total SO2) 50 mL

Mi555-002 Titrant (for Free & Total SO2)

Mi555-003 Alkaline Reagent (for Total SO2)5mL

Mi555-004 Acid Reagent (for Total SO2)5mL

Mi555-005 Acid Reagent (for Free SO2)5mL

Mi555-006 Stabilizer (for Free & Total SO2) 1 packet

Instruction Manual Mi455 FREE & TOTAL SULPHUR DIOXIDE 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. See the label on the instrument rear for this.

• Place the peristaltic pump tube on the pump. See the Pump Tube Replacement section

for the procedure.

• Remove the reagent bottle cap and place the bottle cap of the tubes set. Place the

reagent bottle in the appropriate place on the titrator top.

• Connect the tubes with the peristaltic pump (inlet tube is connected with the reagent

bottle, outlet tube is connected with the dosing tip).

• Turn the instrument ON using the power switch from the rear panel of the instrument

and wait until it displays dashes.

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PROBE FUNCTIONAL DESCRIPTIONPROBE FUNCTIONAL DESCRIPTION

PROBE FUNCTIONAL DESCRIPTION

GUIDE TO DISPLAY CODES

Purging mode message.

Main screen display with stirrer active.

Main screen display.

This screen appears for a few seconds each time the

instrument is turned ON.

This screen appears each time the meter enters pump

calibration mode. The meter is ready to start pump

calibration by pressing the START STOP button.

PUMP CALIBRATION MESSAGES

This screen appears while pump calibration is in progress.

Pressing CAL or START STOP button, the minititrator

returns to the main screen.

This screen appears for a few seconds before returning

to the main screen, when pump calibration is done.

Instruction Manual Mi455 FREE & TOTAL SULPHUR DIOXIDE Minititrator for wine analysis

1010

The used standard solution is wrong.

This error message appears when the input readings

(mV) exceed the input limits (0

1000mV).

This error message appears when the sample

concentration exceeds 400 ppm.

This screen appears each time a titration is running.

When the START STOP button is pressed the minititrator

returns to the main screen.

TITRATION MESSAGES

The titration result, expressed as concentration of sulphur

dioxide in ppm (mg/L), is displayed at the end of the titration

process. Press the START STOP button to return to the main

screen.

This error message appears when the input reading

exceeds the input limits (0

1000mV).

This screen appears when the sample concentration

exceeds 400 ppm.

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