Milwaukee MA886 Manual de usuario
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MA886
Refractometer for SodiumRefractometer for Sodium
Refractometer for SodiumRefractometer for Sodium
Refractometer for Sodium
Chloride MeasurementsChloride Measurements
Chloride MeasurementsChloride Measurements
Chloride Measurements
Milwaukee RefractometerMilwaukee Refractometer
Milwaukee RefractometerMilwaukee Refractometer
Milwaukee Refractometer
INSTRUCTION MANUAL
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Instruction Manual MA886 Refractometer for Sodium Chloride Measurements
FUNCTIONAL DESCRIPTION ............................................................................. 3
GENERAL DESCRIPTION .................................................................................... 5
SPECIFICATIONS .............................................................................................. 6
PRINCIPLE OF OPERATION ................................................................................ 6
MEASUREMENT GUIDELINES .............................................................................. 8
CALIBRATION PROCEDURE ............................................................................... 8
MEASUREMENT PROCEDURE ........................................................................... 10
CHANGING MEASUREMENT UNIT ................................................................... 11
CHANGING TEMPERATURE UNIT ..................................................................... 12
MAKING A STANDARD SODIUM CHLORIDE SOLUTION .................................... 12
ERROR MESSAGES ........................................................................................... 13
BATTERY REPLACEMENT ................................................................................... 14
WARRANTY ..................................................................................................... 15
TABLE OF CONTENTS
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 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.
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FUNCTIONAL DESCRIPTION
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. AUTOMATIC TEMPERATURE COMPENSATION
(BLINKS WHEN TEMPERATURE EXCEEDS 10-40 °C / 50-104 °F RANGE)
F. PRIMARY DISPLAY (DISPLAYS MEASUREMENT AND ERROR MESSAGES)
G. TEMPERATURE UNITS
H. SECONDARY DISPLAY (DISPLAYS TEMPERATURE MEASUREMENTS; WHEN BLINKING,
TEMPERATURE HAS EXCEEDED OPERATION RANGE: 0-80 °C / 32-176 °F)
I. RANGE INDICATOR
DISPLAYDISPLAY
DISPLAYDISPLAY
DISPLAY
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Instruction Manual MA886 Refractometer for Sodium Chloride Measurements
I. BATTERY COVER
J. BATTERY COMPARTMENT
BOTTOMBOTTOM
BOTTOMBOTTOM
BOTTOM
A. LIQUID CRYSTAL DISPLAY (LCD)
B. READ KEY (USER MEASUREMENT)
C. ZERO KEY (USER CALIBRATION)
D. RANGE KEY (USER MEASUREMENT UNIT)
E. ON/OFF
F. STAINLESS STEEL SAMPLE WELL AND PRISM
G. SECONDARY DISPLAY
H. PRIMARY DISPLAY
FRONT PANELFRONT PANEL
FRONT PANELFRONT PANEL
FRONT PANEL
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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 MA886 is an optical instrument that employs the measurement of the refractive index
to determine sodium chloride concentration in aqueous solutions used in food preparation.
It is not intended for sea water salinity measurements. The measurement of refractive index
is simple and quick and provides the user an accepted method for NaCl analysis. Samples
are measured after a simple user calibration with deionized or distilled water. Within
seconds the instrument measures the refractive index of the solution. The digital refractometer
eliminates the uncertainty associated with mechanical refractometers and is easily portable
for measurements where you need them.
The instrument utilizes internationally recognized references for unit conversion and
temperature compensation. It can display the measurement of NaCl concentration 4 different
ways: g/100 g, g/100 mL, Specific Gravity, and °Baumé.
Temperature (in °C or °F) is displayed simultaneously with the measurement (on 3 of the
ranges) on the large dual level display along with icons for Low Power and other helpful
message codes.
Key features include:
• Waterproof models offers IP65 waterproof protection
• Automatic Temperature Compensation (ATC)
• Battery operation with Low Power indicator
• Automatically turns off after 3 minutes of non-use.
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Instruction Manual MA886 Refractometer for Sodium Chloride Measurements
PRINCIPLE OF OPERATION
Light Source Yellow LED
Measurement Time Approximately 1.5 seconds
Minimum Sample Volume 100 PL (cover prism totally)
Sample Cell Stainless Steel 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 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.).
SPECIFICATIONS
g001/gLm001/gytivarGcificepSémuaB°)F°(C°
:egnaR 82ot043ot0612.1ot000.162ot0)F°671ot23(C°08ot0
:noituloseR 1.01.0100
.01.0)F°1.0(C°1.0
:ycaruccA 2.0±2.0±200.0±2.0±)F°5.0±(C°3.0±
Aqueous NaCl determinations are 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.
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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:
sin (Tcritical) = n2/ n1
Where n2is the refractive index of the lower-density medium; n1is the refractive index of
the higher-density medium.
In the MA886 refractometer, 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.
Specialized algorithms then apply temperature compensation to the measurement
and convert this refractive index to: g/100 g (% by mass), g/100 mL, Specific Gravity
(S.G. 20/20), or Baumé.
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Instruction Manual MA886 Refractometer for Sodium Chloride Measurements
CALIBRATION PROCEDURE
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 sodium chloride 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.
• Cover sample well with hand if measuring in direct sun.
Calibration should be performed daily, before measurements are made, when the
battery has been replaced, between a long series of measurements, or if environmental
changes have occured since the last calibration..
1. Press the ON/OFF key, then release. Two instrument test screens will be displayed
briefly; all LCD segments followed by the percentage of remaining battery life. It will
briefly display an indication of the measurement units set. When the LCD displays
dashes, the instrument is ready.
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2. Using a plastic pipette, fill the sample well with distilled or deionized water. Make
sure the prism is completely covered.
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 page 13).
Note: The 0.0 screen will remain until a sample is measured or the power is turned off.
4. Gently absorb the ZERO water standard with a soft tissue. Use care not to scratch
the prism surface. Dry the surface completely. The instrument is ready for sample
measurement.
Note: If instrument is turned off the calibration will not be lost.
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Instruction Manual MA886 Refractometer for Sodium Chloride Measurements
MEASUREMENT PROCEDURE
Verify the instrument has been calibrated before taking measurements.
1. Wipe off prism surface located at the bottom of the sample well. Make sure the prism
and sample well are completely dry.
2. Using a plastic pipette, 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. The results are displayed in unit of interest.
Note: The last measurement value will be displayed until the next sample is measured
or the instrument is turned off. Temperature will be continuously updated.
Note: The “ATC” tag blinks and automatic temperature compensation is disabled if the
temperature exceeds the 10-40 °C / 50-104 °F range.
Note: Temperature is not displayed in Baumé mode.
4. Remove sample from the sample well by absorbing on a soft tissue.
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