milwaukee MA873 Digital Glucose Refractometer Instruction Manual

milwaukee MA873 Digital Glucose Refractometer Instruction Manual

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)

Front Panel

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

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 MA873 is an optical instrument that employs the measurement of refractive index to determine the % Glucose 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 MA873 digital refractometer eliminates the uncertainty associated with mechanical refractometers and is easily portable for measurements on the go.

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:

• Dual-level LCD
• Automatic Temperature Compensation (ATC)
• Easy setup and storage
• Battery operation with Low Power indicator (BEPS)
• Automatically turns off after 3 minutes of non-use.

Remove the instrument from the packing materials and examinecarefully to ensure no damage has occurred during shipping. If any damage has occurred, notify your Dealer.

Each MA873 instrument is supplied with:

• 9 V battery
• Instruction 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

• 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:m  ABS
• Enclosure Rating:  IP 65
• Battery Type/Life:  1 x 9 volt AA batteries / 5000 readings
• Auto-Shut off : 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.)

PRINCIPLE OF OPERATION

The Glucose determination is made by measuring the 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 different 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 off the interface. The critical angle can be used to easily calculate the refractive index according to the equation:

Where n2 is the refractive index of the lower-density medium; n1 is the refractive index of the higher-density medium.

In the MA873, 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 MA873 automatically applies temperature compensation to the measurement and converts the refractive index of the sample to Glucose concentration in units of percent (by weight).

MEASUREMENT GUIDELINES

• Handle instrument carefully. Do not drop.
• Do not immerse instrument under water.
• Do not spray water to any part of instrument except the “sample well” located over the prism.
• The instrument is intended to measure sugar solutions. Do not expose instrument or prism to solvents that will damage it. This includes most organic solvents and extremely hot or cold solutions.
• Particulate 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.
• Use plastic pipettes to transfer all solutions. Do not use metallic tools such as needles, spoons or tweezers as these will scratch the prism.

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.

3. Press the ZERO key. If no error messages appear, your unit is calibrated. (For a description of error messages see “ERROR MESSAGES” section).
   Note: The 0.0 screen will remain until a sample is measured or the power is turned of
   

4. Gently absorb the ZERO water standard with a soft tissue. Use care not to scratch the prism surface. Wipe off the surface completely. The instrument is ready for sample measurement.
   Note: If instrument is turned off the calibration will not be lost.

MEASUREMENT PROCEDURE

Verify the instrument has been calibrated before taking measurements

1. Wipe off prism surface located at the bottom of the sample well.

2. Using plastic pipettes, drip sample onto the prism surface. Fill the well completely.

Note: If the temperature of the sample differs significantly from the temperature of the instrument, wait approximately 1 minute to allow thermal equilibration.

3. Press the READ key. Measurement is displayed in units of % by weight (w/w).
   
   Note: The ATC tag blinks and automatic temperature compensation is disabled if the temperature exceeds the 10‑40 °C / 50‑104 °F range.

4. Remove sample from the sample well by absorbing with a soft tissue.

5. Using plastic pipettes, rinse prism and sample well with distilled or deionized water. Wipe dry. The instrument is ready for the next sample.
   

MAKING A STANDARD % GLUCOSE SOLUTION

To make a Glucose Solution, follow the procedure below:

• Place container (such as a glass vial or dropper bottle that has a cover) on an analytical balance.
• Tare the balance.
• To make an X Glucose solution weigh out X grams of high purity Glucose (CAS #: 50-99-7) directly into the container.
• Add distilled or deionized water to the container so the total weight of the solution is 100g.

Note: Solutions above 20% may need to be vigorously stirred or shaken and heated in a water bath to roughly 40 °C (104 °F). Remove solution when glucose has dissolved. Cool completely before use. The total quantity can be scaled proportionally for smaller containers but accuracy may be sacrificed.

Example with 10% Glucose:

CHANGING TEMPERATURE UNIT

To change the temperature measurement unit from Celsius to Fahrenheit (or vice versa), follow this procedure.

1. Press and hold the ON/OFF key continuously for approximately 8 seconds. The LCD will display the “all segment” screen followed by a screen with the model number on the primary display and the version number on the secondary display. Continue pressing the ON/OFF key.
   

2. While continuing to hold the ON/OFF key, press the ZERO key. The temperature unit will change from °C to °F or vice versa.

ERROR MESSAGES

error, contact Milwaukee
LO Top display|

| Sample is reading lower than the 0 % standard used for meter calibration.
HI Top display|

| Sample exceeds maximum measurement range.
LO Top display CAL segment ON|

| Wrong calibration used to zero instrument. Use deionized or distilled water. Press Zero
HI Top display CAL segment ON|

| Wrong calibration used to zero instrument. Use deionized or distilled water. Press Zero.
t LO Top display CAL segment ON|

| Temperature exceeds ATC low limit (10 °C) during calibration
t HI Top display CAL segment ON| | Temperature exceeds ATC high limit (40 °C) during calibration.
Air| | Prism surface insufficiently covered.
ELt|

| Too much external light for measurement. Cover sample well with hand.
nLt|

| LED light is not detected. Contact Milwaukee.
Battery segment blinking| | <5% of battery life is remaining.
Temperature values are blinking 0.0°C or 80.0°C| | Temperature measurement out of sampling range (0.0 to 80.0°C).
ATC segment
blinking|

| Outside temperature compensation range (10 to 40°C)
SETUP segment blin|

| Factory calibration lost. Contact Milwaukee.

BATTERY REPLACEMENT

To replace the instrument’s battery, follow these steps:

• Turn the instrument OFF by pressing the ON/OFF key.

• Turn instrument upside down and remove the battery cover by turning it counterclockwise.

• Extract the battery from its location.

• Replace with fresh 9V battery making certain to observe polarity.

• Insert the back battery cover and fasten it by turning clockwise to engage.

CERTIFICATION

Milwaukee Instruments conform to the CE European Directives.

Disposal of Electrical & Electronic Equipment. Do not treat this product as household waste. Hand it over to the appropriate collection point for the recycling of electrical and electronic equipment.

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 (US only) or www.milwaukeeinst.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.

WARRANTY

This instrument is warranted against defects in materials and manufacturing for a period of 2 years from the date of purchase. Electrodes and Probes are warranted for 6 months. 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.

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

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

THANK YOU FOR CHOOSING

Documents / Resources

| milwaukee MA873 Digital Glucose Refractometer [pdf] Instruction Manual
MA873, Digital Glucose Refractometer
---|---

References

• Shop Milwaukee Instruments - the Official EU Site
• Shop Milwaukee Instruments - Official US Site

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>