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Instruction Manual MA887 Refractometer for Seawater Measurements
PRINCIPLE OF OPERATION
Light Source
Yellow LED
Measurement Time
Approximately 1.5 seconds
Minimum Sample Volume
100
μ
L (cover prism totally)
Sample Cell
Stainless Steel ring and flint glass prism
Temperature Compensation
Automatic between 0 and 40 °C (32 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
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Salinity determinations are made by measuring the refractive index of seawater. 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.
