PST MA886 Manuale utente
INSTRUCTION MANUAL
SATISFACTION
GUARANTEED
MA886
Digital Sodium Chloride
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, NC27804USA.
THANK YOU for choosing Milwaukee Instruments!
This instruction manual will provide you the necessary
information for correct use of the meters.
3
TABLE OF CONTENTS
1. FUNCTIONAL DESCRIPTION.................................................................................5
2. GENERAL DESCRIPTION.........................................................................................7
3. SPECIFICATIONS........................................................................................................8
4. PRINCIPLE OF OPERATION...................................................................................9
5. MEASUREMENT GUIDELINES.............................................................................11
6. CALIBRATION PROCEDURE.................................................................................12
7. MEASUREMENT PROCEDURE............................................................................ 14
8. CHANGING MEASUREMENT UNIT.................................................................. 16
9. CHANGING TEMPERATURE UNIT.....................................................................17
10. MAKING A STANDARD SODIUM CHLORIDE SOLUTION..................... 18
11. ERROR MESSAGES ................................................................................................ 19
12. BATTERY REPLACEMENT ...................................................................................21
CERTIFICATION..............................................................................................................22
RECOMMENDATION....................................................................................................22
WARRANTY......................................................................................................................22
4MA886 Digital Sodium Chloride Refractometer
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:
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.
FUNCTIONAL DESCRIPTION 5
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. 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
6MA886 Digital Sodium Chloride Refractometer
FRONT PANEL
MA886
Digital Sodium Chloride
Refractometer
1 g/100 g
2 g/100 mL
3 S.G. (20/20)
4 Baumé
A H G F
B C ED
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
BOTTOM
I
J
I. BATTERY COVER
J. BATTERY COMPARTMENT
GENERAL DESCRIPTION 7
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.
TheMA886 isan optical instrumentthat employs themeasurement
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 dierent 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:
yWaterproof models oers IP65 waterproof protection
yAutomatic Temperature Compensation (ATC)
yBattery operation with Low Power indicator
yAutomatically turns o after 3 minutes of non-use.
8MA886 Digital Sodium Chloride Refractometer
3. SPECIFICATIONS
g/100 g g/100 mL Specific
Gravity °Baumé °C (°F)
Range: 0 to 28 0 to 34 1.000 to 1.216 0 to 26 0 to 80 °C
(32 to 176 °F)
Resolution: 0.1 0.1 0.001 0.1 0.1 °C
(0.1 °F)
Accuracy: ±0.2 ±0.2 ±0.002 ±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 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 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.).
PRINCIPLE OF OPERATION 9
4. PRINCIPLE OF OPERATION
AqueousNaCldeterminationsaremadebymeasuringtherefractive
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. Aresult of this property is
that light will “bend”, or change direction, when it travels through
a substance of dierent 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.
i
r
n1
n2
= angle of incidence
= angle of refraction
n1 , n2 - refractive index
Refraction Critical Angle Total Internal Reflection
r
i
i critical
i
r
n2
n1
n2
i
i critical
i critical
< >
=
n1
θ
θ
θ
θ
θ θ
θ
θ
θ
θ θ
θ θ
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.
10 MA886 Digital Sodium Chloride Refractometer
Prism
Lens
L
inear Image Sensor
Sample
Shadow
Led
Sample Well
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.
Indice
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