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Automatic
Temperature
(ATC) system:
When using models provided with auto-
matic temperature compensation (ATC), it is
not necessary to look up the attached charts
to correct the measuring according to the wor-
king temperature, since this compensation is
made automatically by the instrument.
This system makes possible to measure the
concentration of a solution without taking
into account the temperature.
4. THEORETICAL FOUNDATIONS
Refractometry
When a light beam reaches the surface of
separation between two different environ-
ments, part of this light is reflected and the
rest of it is refracted (it goes in the second en-
vironment), propagating with a different
angle and speed than in the first environment.
These two magnitudes can be characterized
by means of the refractive index, which is a
characteristic value for each substance.
Figure 3
incident
ray
MEDIUM A
MEDIUM B
refracted
angle
The refractive index is related to the mass,
the load and the number of particles of the
substance through which the light radiation is
transmitted. There are different kinds of re-
fractometers but most of them are based on the
same principle.
An example that explains clearly the pheno-
menon of refraction is what happens when we
introduce a pencil into a glass filled with water:
the part of the pencil that is dipped into the
water seems to be bent with regards to the
other part that is out of the water. This is the
phenomenon of light refraction. If we sub-
merge the pencil in hot sugar-saturated water
the point of the pencil seems to be even more
bent.
Pag. 34
Manual 50100xxx
Compensation
I= incident angle
r= refractive angle
N= normal
Version 8 Jan-2015
Automatic Temperature Compensation (10-
30º C).
Scale:
0-140º Oe
0-25º KMW Babo
0-32% mas sacch
Accuracy: 1º Oe
0.2º KMW Babo
0.2% mas sacch
Size: 27x40x160 mm
Model 50305170
Designed for measuring the Oeschle degree
of fruit juice. Calibration is made with disti-
lled water and it is provided with Automatic
Temperature Compensation (10-30º C).
Scale:
0-170º Oe
Accuracy: 2º Oe
Size: 27x40x160 mm
Milk refractometer
Model 50308000
It is used to measure the water content in
milk. Calibration is made with distilled water
and it is provided with Automatic Tempera-
ture Compensation (10-30º C).
Scale: -1 - 20%
Accuracy: 0.2%
Size: 27x40x160 mm
Batteries and anti-freezing refractometers
Model 50304010
It is used to measure the freezing point of
cooling systems based on ethylene and
propylene glycol, as well as for checking the
strength of the electrolytic solutions of batte-
ries. Calibration is made with distilled water.
Scale:
- 60 a 32ºF (ethylene glycol)
-50 a 32 ºF (propylene glycol)
(anti-freezing)
1.15 - 1.30 sg (Battery)
Accuracy: 10 ºF
0.01 sg
Size: 27x40x160 mm
Manual 50100xxx
Version 8 Jan-2015
20
20
15
15
10
10
Milk
15ºC
5
5
0
0
%
Pag. 31
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