PM-595 ABBE REFRACTOMETER

For convenient accurate and quick determination of the
refractive indices, mean dispersion of liquids, solids, powder
requiring no calculation and skillfulness. Correct refractive
index & sugar percentage can be read directly in the field.
Heavy casted round base with aluminium body and all other parts 0
of plated brass. Fixed body leaned at 60 angle, Abbe double prisms
with the thermostat, compensator, telescope mirror, limb,
graduated sector, reading magnifier and radial arm which carries
vernier. Abbe’s double prisms leaves a narrow space between the
adjoining faces of the prisms. Compensator consists of the amici
prisms which serve for rendering the line of achromatic separation.
Adjust the eye pieces of both telescopes and reading magnifier, so
that well defined images of cross lines and scales is obtained. Open
the Abbe’s double prism and put two or three drops of liquid upon
the adjoining face of the prism for measuring. When the prisms are
closed the liquid spreads over the whole surface of the prisms
forming a thin layer. Adjust the mirror to get proper incident light,
and also the compensator and radial arm, so that the boundary line
of bright and dark is clearly seen in the visual field of telescope. Turn
radial arm by means of fine adjustment to bring the line precisely on
the cross line and read of scale on the sector. For the dark color
substance to be examined as molasses, fructose or jam, the light
from the mirror is not sufficient for observation, take off the cover
of the circular opening. Then the light proceeds so as to be reflected
on the boundary surface and the prism for convenient observation.
Abbe double prisms are heated by a double jacket metal casing in
which warm water under 70°C circulates. Temperature of water can
be adjusted and read by the thermometer fitted at the double
prism. To check the instruments for its accuracy with the aid of the
standard plate and liquid that accompanies. Apply a small drop of
standard oil on the standard plate and place it with a gentle
pressure upon the face of the polished refractometer prism. Critical
line should then be achromatized by means of compensator.
Repeated readings should be taken, and compare the result of
readings with the value of index mentioned on the standard plate.
Complete with standard glass test plate, 4 ml. Monobrom
Naphthalene (contact liquid), thermometer in a metal jacket, zero
aluminium knob, brush, dust cover in a wooden cabinet

SKU: PM-595 ABBE REFRACTOMETER Category: