The refractive index (RI) is a constant for a given pair of materials. It can be defined as the speed of light in material A divided by the speed of light in material B. It is the ratio of the velocity of light in a vacuum to its velocity in the substance. It is also the ratio of the sine of the angle of incidence to the sine of the angle of refraction ASTM D642. There are no units associated with the index of refraction.
Brix is a sugar industry term which relates the weight of total solids to the weight of solids + water. Relationship between Brix and Conductivity: 70 Brix at 60°C = 8 mS/cm. On the Brix scale graduations are equal to the percent by weight of sucrose in solution at standard temperature.
Other unlisted measurements including high fructose corn syrup (HFCS), energy per gram of solution, dissolved solids concentration, total titratable alkali content, etc.
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The ratio of the velocity of light in a vacuum to the velocity in some medium. Refractive index generally increases with the concentration of the sample. There are no units associated with the index of refraction.
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Brix is a sugar industry term which relates the weight of total solids to the weight of solids + water. Relationship between Brix and Conductivity: 70 Brix at 60°C = 8 mS/cm. On the Brix scale graduations are equal to the percent by weight of sucrose in solution at standard temperature.
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The range of the wavelength of light refracted by the prism in the refractometer.
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This is the full required range of ambient operating temperature.
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The samples are individually injected into the refractometer for analysis. The refractometer is not part of a process line.
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The instrument is mounted or fixtured in place for long term use.
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The instrument has an analog display or control panel. Analog display would consist of a meter or simple indicator. Analog control panel consists of analog user inputs such as potentiometers, dials, switches, for adjustment of output, ranges, etc.
The machine uses a digital display or control panel. Digital displays provide a discrete numeric or alphanumeric visual output such as LED or LCD displays. Digital control panels have digital keypads or menus for programming.
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The refractive index of a sugar solution changes with temperature while its solid content remains the same. The error due to temperature variation is of the magnitude of up to 2 BRIX° error. The ATC corrects for this error. Thus, the RI of the solution shown by the refractometer is the RI of that solution after compensating for temperature.
In some applications the sample temperature must be controlled either by the refractometer or a circulating water bath to get a stable and correct reading. If the refractometer has a thermostat the temperature can be controlled.
For any refractometer it is necessary to keep the prism surface clean. A prism wash system will clean the prism without having to remove it from the refractometer.
The device must be certified by a national or international organization (USDA, FDA, UNICEF, etc.) for use in a sanitary environment such as in medical or food processing applications.
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. There are no units associated with the index of refraction.