Milwaukee MA881 Manuel utilisateur

INSTRUCTION MANUAL

SATISFACTION

GUARANTEED

MA881

Digital Invert Sugar

Refractometer

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 meters.

TABLE OF CONTENTS

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

2. GENERAL DESCRIPTION........................................................................................6

3. SPECIFICATIONS.........................................................................................................7

4. PRINCIPLE OF OPERATION...................................................................................8

5. MEASUREMENT GUIDELINES.............................................................................9

6. CALIBRATION PROCEDURE................................................................................ 10

7. MEASUREMENT PROCEDURE.............................................................................12

8. CHANGING TEMPERATURE UNIT.................................................................... 14

9. ERROR MESSAGES................................................................................................. 15

10. BATTERY REPLACEMENT...................................................................................17

CERTIFICATION.............................................................................................................. 18

RECOMMENDATION.................................................................................................... 18

WARRANTY...................................................................................................................... 18

4MA881 Digital Invert Sugar Refractometer

1. FUNCTIONAL DESCRIPTION

DISPLAY

A. BATTERY STATUS ICON

(BLINKS WHEN LOW BATTERY CONDITION DETECTED)

B. MEASUREMENT IN PROGRESS TAG

C. SETUP: FACTORY CALIBRATION TAG

D. CAL: CALIBRATION TAG

E. PRIMARY DISPLAY

(DISPLAYS MEASUREMENT AND ERROR MESSAGES)

F. AUTOMATIC TEMPERATURE COMPENSATION

(BLINKS WHEN TEMPERATURE EXCEEDS 10-40 °C / 50-104 °F

RANGE)

G. TEMPERATURE UNITS

H. SECONDARY DISPLAY

(DISPLAYS TEMPERATURE MEASUREMENTS;

WHEN BLINKING, TEMPERATURE HAS EXCEEDED OPERATION

RANGE: 0-80 °C / 32-176 °F)

FUNCTIONAL DESCRIPTION 5

FRONT PANEL

MA881

Digital Invert Sugar Refractometer

0 to 85 %Mass

A E F G

B C D

A. LIQUID CRYSTAL DISPLAY (LCD)

B. READ KEY (USER MEASUREMENT)

C. ZERO KEY (USER CALIBRATION)

D. ON/OFF

E. PRIMARY DISPLAY

F. SECONDARY DISPLAY

G. STAINLESS STEEL SAMPLE WELL AND PRISM

BOTTOM

H. BATTERY COVER

I. BATTERY COMPARTMENT

6MA881 Digital Invert Sugar Refractometer

2. GENERAL DESCRIPTION

SIGNIFICANCE OF USE

Thank you for choosing Milwaukee. This instruction manual will

provide you the necessary information for correct use of the meter.

The MA881 is an optical instrument that employs the measurement

of refractive index to determine the % Invert Sugar in aqueous

solutions. The method is both simple and quick. Samples are

measured after a simple user calibration with deionized or distilled

water. Within seconds the instrument measures the refractive

index of the sample and converts it to % by weight concentration

units. The MA881 digital refractometer eliminates the uncertainity

associated with mechanical refractometers and is easily portable

for measurements in the field.

The measurement technique and temperature compensation

employ methodology recommended in the ICUMSA Methods Book

(Internationally recognized body for Sugar Analysis).

Temperature (in °C or °F) is displayed simultaneously with the

measurement on the large dual level display along with icons for

Low Power and other helpful message codes.

Key features include:

yDual-level LCD

yAutomatic Temperature Compensation (ATC)

yEasy setup and storage

yBattery operation with Low Power indicator (BEPS)

yAutomatically turns o after 3 minutes of non-use.

Remove the instrument from the packing materials and examine

carefully to ensure no damage has occurred during shipping. If

any damage has occurred, notify your Dealer.

Each MA881 instrument is supplied with:

y9 V battery

yInstruction manual

Note: Save all packing material until you are sure that the

instrument functions correctly. A defective instrument must be

returned in its original packing.

SPECIFICATIONS 7

3. SPECIFICATIONS

Range 0 to 85% 0 to 80 °C (32 to 175 °F)

Resolution 0.1% 0.1 °C (0.1 °F)

Accuracy ± 0.2% ± 0.3 °C (± 0.5 °F)

Light Source Yellow LED

Measurement Time Approximately 1.5 seconds

Minimum Sample Volume 100 µL (cover prism totally)

Sample Cell SS ring and flint glass prism

Temperature

Compensation

Automatic between 10 and 40 °C

(50 to 104 °F)

Case Material ABS

Enclosure Rating IP 65

Battery Type/Life 1 x 9 volt AA batteries / 5000 readings

Auto-Shut o After 3 minutes of non-use

Dimensions 19.2 x 10.2 x 6.7 cm (7.5 x 4 x 2.6")

Weight 420 g (14.8 oz.).

8MA881 Digital Invert Sugar Refractometer

4. PRINCIPLE OF OPERATION

TheInvert sugardetermination is madeby measuringthe refractive

index of a solution. Refractive Index is an optical characteristic of a

substance and the number of dissolved particles in it. Refractive

Index is defined as the ratio of the speed of light in empty space

to the speed of light in the substance. A result of this property is

that light will “bend”, or change direction, when it travels through

a substance of dierent refractive index. This is called refraction.

When passing from a material with a higher to lower refractive

index, there is a critical angle at which an incoming beam of

light can no longer refract, but will instead be reflected o the

interface. The critical angle can be used to easily calculate the

refractive index according to the equation:

sin (θcritical) = n2/ n1

Where n2is the refractive index of the lower-density medium; n1is

the refractive index of the higher-density medium.

= angle of incidence

= angle of refraction

n1 , n2 - refractive index

Refraction Critical Angle Total Internal Reflection

i critical

< >

θ θ

In the MA881, light from an LED passes through a prism in contact

with the sample. An image sensor determines the critical angle

at which the light is no longer refracted through the sample. The

MA881 automatically applies temperature compensation to the

measurement and converts the refractive index of the sample to

Invert sugar concentration in units of percent (by weight).

Prism

Lens

Linear Image Sensor

Sample

Shadow

Led

Sample Well

MEASUREMENT GUIDELINES 9

5. MEASUREMENT GUIDELINES

yHandle instrument carefully. Do not drop.

yDo not immerse instrument under water.

yDo not spray water to any part of instrument except the

“sample well” located over the prism.

yThe instrument is intended to measure seawater solutions. Do

not expose instrument or prism to solvents that will damage

it. This includes most organic solvents and extremely hot or

cold solutions.

yParticulate matter in a sample may scratch the prism. Absorb

sample with a soft tissue and rinse sample well with deionized

or distilled water between samples.

yUse plastic pipettes to transfer all solutions. Do not use

metallic tools such as needles, spoons or tweezers as these

will scratch the prism.

10 MA881 Digital Invert Sugar Refractometer

6. CALIBRATION PROCEDURE

Calibration should be performed daily, before measurements are

made, when the battery has been replaced, or between a long

series of measurements.

1. Press the ON/OFF key, then release. Two instrument test

screens will be displayed briefly; an “all segment” screen

followed by the percentage of remaining battery life. When

LCD displays dashes, the instrument is ready.

2. Using plastic pipettes, fill the sample well with distilled or

deionized water.

Note: If the ZERO sample is subject to intense light such as

sunlight or another strong source, cover the sample well with

your hand or other shade during the calibration.

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