milwaukee MI490 Photometer for Edible Oils Peroxide Value Instruction Manual

: June 5, 2024
: Milwaukee

milwaukee MI490 Photometer for Edible Oils Peroxide Value

THANK YOU for choosing Milwaukee Instruments!
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.

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

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.

< 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:

Reagents for 10 tests (MI490A-0, MI490B-0)
Four graduated 1 mL syringes
Tissue for wiping vials
Four 1.5V AA batteries
Instruction manual
Instrument quality certificate
Warranty card

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 off| 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

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 off. Change the batteries and restart the meter.

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

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

The official method EC 2568/91 recommends to work at room temperature, between 15 and 25 °C.
Whenever 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.
In order to avoid reagent leaking and to obtain more accurate measurements, it is recommended to close the cuvet very well with the cap.
In 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.
Proper 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

Read the entire instructions before using the kit.

Remove the cap from a vial of MI490A-0 Peroxide reagent.
Use 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.
Add the sample to the vial and replace the cap.
Mix by inverting the vial twice.
Turn on the meter by pressing the ON/OFF key.
When the LCD displays “—“, it is ready.
Place the vial into the instrument.
Press the ZERO key and “—-” will blink on the display.
After a few seconds the display will show “-0.0-“. The meter is zeroed and ready for measurement. Remove the vial.
Remove the cap from the vial and add one packet of MI490B-0 Peroxide reagent.
Replace the cap and press TIMER to start the countdown.
Mix vigorously for 1 minute.
Insert the vial into the instrument and wait for 5 minutes.
Note: 30 seconds before countdown finishes, invert the vial twice.
When 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.
The 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.

ERROR MESSAGES

The meter has lost its configuration. Contact your dealer or the nearest Milwaukee Instruments Customer Service Center.

On Zero Reading

“Light high”: there is too much light to perform a measurement. Please check the preparation of the zero cuvet.

“Light low”: there is not enough light to perform a measurement. Please dilute the sample five times (see GENERAL TIPS FOR AN ACCURATE MEASUREMENT).

“No Light”: the instrument cannot adjust the light level. Please check that the sample does not contain any debris.

On Sample Reading

“Inverted”: the sample and the zero cuvet are inverted.

The sample absorbs less light than the zero reference. Check the procedure and make sure you use the same cuvet for reference (zero) and measurement.

A flashing value of the maximum concentration indicates an over range condition. The concentration of the sample is beyond the programmed range: dilute the sample and measure again.

BATTERY REPLACEMENT

Battery replacement must only take place in a non-hazardous area. The blinking ” ” will appear when the batteries power gets low. When batteries are completely discharged, “0% bAtt” will appear and after two seconds the instrument is switched off.
Remove the battery cover from the bottom of the instrument and change the old batteries with 4 fresh 1.5V batteries, paying attention to the correct polarity. Replace the cover.

ACCESSORIES

Reagent Sets

Mi590-021| Peroxides reagents (21 tests)
Other Accessories

Mi0006| 1.5V AA batteries (4 pcs.)
Mi0004| Tissue for wiping cuvets (4 pcs.)

CERTIFICATION

Milwaukee Instruments conform to the CE European Directives.

Disposal of waste batteries. This product contains batteries. Do not dispose of them with other household waste. Hand them over to the appropriate collection point for recycling.

Please note: proper product and battery disposal prevents potential negative consequences for human health and the environment.. For detailed information, contact your local household waste disposal service or go to www.milwaukeeinstruments.com.

RECOMMENDATION

Before using this product, make sure it is entirely suitable for your specific application and for the environment in which it is used. Any modification introduced by the user to the supplied equipment may compromise the meter’s performance. For your and the meter’s safety do not use or store the meter in hazardous environment. To avoid damage or burn, do not perform any measurement in microwave ovens. The chemicals contained in this kit may be hazardous if improperly handled. Read the relevant Health and Safety Data Sheet before performing this test.

WARRANTY

This instrument is warranted against defects in materials and manufacturing for a period of 2 years from the date of purchase. This warranty is limited to repair or free of charge replacement if the instrument cannot be repaired. Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered by warranty. 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.
MANMI490 09/20

Milwaukee Instruments reserves the right to make improvements in design, construction and appearance of its products without advance notice.

THANK YOU FOR CHOOSING

Sales and Technical Service Contacts:

Milwaukee Electronics Kft.
Alsó-kikötő sor 11C
H-6726 Szeged – HUNGARY
tel: +36 62 428 050
fax: +36 62 428 051
www.milwaukeeinst.com
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
www.milwaukeeinstruments.com
e-mail: sales@milwaukeeinstruments.com