Milwaukee MI490 Bedienungsanleitung

INSTRUCTION MANUAL

SATISFACTION

GUARANTEED

MI490

Photometer for edible oils

Peroxide value

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.

THANK YOU for choosing Milwaukee Instruments!

This instruction manual will provide you the necessary information for correct use

of the meter.

TABLE OF CONTENTS

1. FUNCTIONAL DESCRIPTION......................................................................................................................................4

2. GENERAL DESCRIPTION.............................................................................................................................................5

3. SPECIFICATIONS.............................................................................................................................................................6

4. GUIDE TO DISPLAY CODES........................................................................................................................................7

5. GENERAL TIPS FOR AN ACCURATE MEASUREMENT..................................................................................8

6. MEASUREMENT PROCEDURE.................................................................................................................................9

7. ERROR MESSAGES........................................................................................................................................................ 11

8. BATTERY REPLACEMENT.........................................................................................................................................12

9. ACCESSORIES ................................................................................................................................................................13

CERTIFICATION...................................................................................................................................................................14

RECOMMENDATION.........................................................................................................................................................14

WARRANTY...........................................................................................................................................................................14

4MI490 Photometer for edible oils

1. FUNCTIONAL DESCRIPTION

Display

A. BATTERY STATUS ICON

B. HOURGLASS ICON

C. LAMP STATUS INDICATOR

D. MEASURE STATUS

E. MEASUREMENT UNIT

F. MAIN DISPLAY

G. PARAMETER NUMBER INDICATOR

H. TIMER MODE INDICATOR

I. SECONDARY DISPLAY

Front Panel

A. LID

B. CUVET HOLDER

C. LIQUID CRYSTAL DISPLAY (LCD)

D. ON/OFF KEY, TO TURN THE METER

ON AND OFF

E. ZERO KEY, TO START THE ZERO

MEASUREMENT

F. READ KEY, TO START THE SAMPLE

MEASUREMENT

G. TIMER KEY, TO ACTIVATE THE

COUNTDOWN MODE TIMER

GENERAL DESCRIPTION 5

2. GENERAL DESCRIPTION

The MI490 is an auto-diagnostic portable microprocessor meter. It has an advanced

optical system based on a special tungsten lamp and a narrow band interference filter

that allows most accurate and repeatable readings. All instruments are factory calibrated.

The auto-diagnostic feature of this meter ensures always optimal measurement

conditions to ensure most precise readings. The light level is automatically adjusted each

time a zero-measurement is made, and the temperature of the lamp is controlled to avoid

overheating.

Significance of Use

Peroxides are the primary products of oil oxidation. Their identification gives useful

information about oil conservation and rancidity. MI490 allows fast and simple analyses

of peroxides in oil in accordance with the EC 2568/91 method.

Oil peroxides content

< 10 meq O2/kg excellent conservation

10-15 meq O2/kg good conservation

< 10 meq O2/kg refined oil

> 20 meq O2/kg rancid oil

This meter is supplied with:

yReagents for 10 tests (MI490A-0, MI490B-0)

yFour graduated 1 mL syringes

yTissue for wiping vials

yFour 1.5V AA batteries

yInstruction manual

yInstrument quality certificate

yWarranty card

6MI490 Photometer for edible oils

3. SPECIFICATIONS

Range 0.0 to 25.0 meq O2/kg

Resolution 0.5 meq O2/kg

Accuracy ±0.5 meq O2/kg

Light Source Tungsten lamp

Light Detector Silicon Photocell with narrow band interference filter @ 466 nm

Method

Adaptation of EC 2568/91 method and following amendments.

The reaction between sample and reagent causes a color

variation, proportional to the peroxide content expressed in

meq O2/kg.

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

Battery Type 4 x 1,5 volt AA batteries

Auto-Shut o After 15’ of non-use in measurement mode

Dimensions 225 x 85 x 80 mm (8.7 x 3.3 x 3.1”)

Weight 500 g (17,6 oz.)

Required Reagents

Code Description Quantity/test

MI490A-0 Peroxide Reagent A 1 vial

MI490B-0 Peroxide Reagent B 1 packet

GUIDE TO DISPLAY CODES 7

4. GUIDE TO DISPLAY CODES

This prompt appears for a few seconds each time the

instrument is turned ON.

This prompt indicates the battery capacity value.

Indicates that the instrument is in a ready state and waiting for

the next command (Timer or Zero).

After Timer is pressed, a blinking hourglass icon appears and

the display shows a 60 minutes countdown. At the end of the

countdown an acoustic signal alerts the user that the timer is

finished.

Indicates that the meter is performing a zero measurement.

The light intensity is automatically readjusted (auto-calibration

features) if necessary.

The instrument is zeroed and a measurement can be made.

Indicates that the meter is making a measurement.

Batteries voltage is getting low and the batteries need to be

replaced.

Indicates that the batteries are dead and must be replaced.

After this message appears, the instrument is switched o.

Change the batteries and restart the meter.

8MI490 Photometer for edible oils

5. GENERAL TIPS FOR AN ACCURATE MEASUREMENT

The instructions listed below should be carefully followed during testing to ensure best

accuracy.

yThe oicial method EC 2568/91 recommends to work at room temperature, between

15 and 25 °C.

yWhenever the vial is placed into the measurement

cell, it must be dry outside, and completely free of

fingerprints, oil or dirt. Wipe it thoroughly with Mi0004

(tissue for wiping cuvets, see chapter ACCESSORIES)

or a lint-free cloth prior to insertion.

yIn order to avoid reagent leaking and to obtain more accurate measurements, it is

recommended to close the cuvet very well with the cap.

yIn order to measure exactly 1 mL of oil:

a. Push the plunger completely into the syringe.

b. Insert the syringe in the oil and push the plunger

up and down twice to rinse and eliminate air

bubbles; then pull the plunger up until the lower

edge of the seal is exactly on the 0.0 mL mark.

c. Take out the syringe and clean the outside of

the syringe tip. Then, keeping the syringe in

vertical position above the vial, push the plunger

completely down into the syringe.

yProper use of the powder reagent packet:

a. use scissors to open the powder packet;

b. push the edges of the packet to form a spout;

c. pour out the content of the packet.

MEASUREMENT PROCEDURE 9

6. MEASUREMENT PROCEDURE

Read the entire instructions before using the kit.

yRemove the cap from a vial of MI490A-0 Peroxide reagent.

yUse the graduated syringe to add exactly 1 mL of oil. For a correct use of the syringe,

please see GENERAL TIPS FOR AN ACCURATE MEASUREMENT.

yAdd the sample to the vial and replace the cap.

yMix by inverting the vial twice.

yTurn on the meter by pressing the ON/OFF key.

When the LCD displays “---”, it is ready.

yPlace the vial into the instrument.

yPress the ZERO key and “----” will blink on the

display.

yAfter a few seconds the display will show “-0.0-”.

The meter is zeroed and ready for measurement.

Remove the vial.

yRemove the cap from the vial and add one packet

of MI490B-0 Peroxide reagent.

yReplace the cap and press TIMER to start the

countdown.

yMix vigorously for 1 minute.

yInsert the vial into the instrument and wait for

5minutes.

Note: 30 seconds before countdown finishes,

invert the vial twice.

10 MI490 Photometer for edible oils

yWhen the countdown finishes, the meter makes

the reading. If you have not used the TIMER

key, press READ to make the measure. In both

cases the display will show “----” during the

measurement.

yThe meter directly displays the peroxide value in meq O2/kg on the LCD.

Notes:

To convert the reading to mmol O2/kg multiply the reading by 0.5.

To convert the reading to mg O2/kg multiply the reading by 8.

Inhaltsverzeichnis

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