Principle Of Operation; Functional Description; Top View; Bottom - Hanna Instruments HI 96801 Instruction Manual

PRINCIPLE OF OPERATION

The Brix determination is 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.
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 (θ ) = n
critical
Where n is the refractive index of the lower-density medium; n
2
density medium.
In the HI 96801, 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.
The HI 96801 automatically applies temperature compensation to the measurement and converts
the refractive index of the sample to sucrose concentration in units of percent (by weight) Brix.
/ n
2 1
is the refractive index of the higher-
1
4

FUNCTIONAL DESCRIPTION

FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION FUNCTIONAL DESCRIPTION

TOP VIEW

1. Liquid Crystal Display (LCD)
2. Read Key (User Measurement)
3. Zero Key (User Calibration)
4. On/Off
5. Primary Display
6. Secondary Display
7. Stainless Steel Sample Well and Prism

BOTTOM

8. Battery Cover
9. Battery Compartment
5