HANNA HI96821 DIG. REFRACTOMETER NACL (SALT)

Hanna offers the HI 96821 digital refractometers for sodium chloride to meet the requirements of the food industry. This optical instrument uses refractive index measurement to determine sodium chloride concentration in aqueous solutions used in food preparation. The instrument is not intended for measurements of seawater salinity.

Refractive index measurement is simple and rapid, providing the user with an accepted method for NaCl analysis. Samples are measured after simple calibration by the user with deionized or distilled water. Within seconds, these instruments measure the refractive index of the solution. The digital refractometer eliminates the uncertainty associated with mechanical refractometers and are easy to carry for measurements where you need them.

The instrument uses internationally recognized references for unit conversion and temperature compensation. It can show the measurement of NaCl concentration in four different ways: g/100g, g/100 ml, relative density and °Baumé. Temperature (in °C) is displayed simultaneously with the measurement (on three of the ranges) on the large two-panel display, along with icons for low voltage and other helpful message codes.

Simple operation: When the HI 96821 is turned on, test screens are displayed, followed by the percentage of battery voltage remaining and the measurement status.

Unit selection: Simply press the range button to cycle through the HI 96821's units of measure: g/100g, g/100 ml, relative density and °Baumé. Temperature selection can also be easily changed.

Calibration:
Perform a quick and easy calibration after startup:
Using a plastic pipette, completely cover the prism in the sample cell with distilled or deionized water
Press the zero button
Measurements

Achieve fast, professional results:
Using a plastic pipette, drip the sample onto the prism surface until the sample cell is full
Press the read key and the results are displayed in the selected units
Working Principle.

Aqueous NaCl determinations are made by measuring the refractive index of a solution. The refractive index is an optical property of a substance and the number of dissolved particles in it. The refractive index is defined as the ratio of the speed of light in empty space to the speed of light in the substance. The consequence of this property is that light will "refract" or change direction when it passes through a substance with a different refractive index. This is called refraction. When an incoming light beam passes from a material with a higher to a lower refractive index, there is a critical angle at which it can no longer be refracted, but instead reflected from the interface.

The critical angle can be used to easily calculate the refractive index according to the equation: sin(critical) = n2/n1. n2 is the refractive index of the lower density medium; n1 is the refractive index of the higher density medium. In the HI 96821 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 by the sample. Specialized algorithms then determine the temperature compensation for the measurement and convert the refractive index into: g/100g (% by mass), g/100 ml, relative density (S.G. 20/20) or °Baumé.

Professional Features:

• Two-part LCD display shows measurement and temperature at the same time
• Automatic temperature compensation
• Simple measurement
• Place a few drops of the sample into the sample cell and press the read button
• IP65 water-resistant protection
• Fast, accurate results
• Measurements are displayed after approximately 1.5 seconds
• 1-point calibration
• With distilled or deionized water
• Small sample size, from 2 drops
• Automatic switch-off
• Stainless steel sample cell