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Models 50305150/50305152 (ECO series)
This instrument measures the probable de-
gree of alcohol in grape juice, as well as
Baumé and Brix degrees, thus allowing to es-
timate the ripeness point of grapes before and
during harvest. Provided with Automatic
Temperature Compensation (10-30º C). Cali-
bration is made with distilled water.
Scale:
0 - 25% Alcohol
0-22ºBaumé
0-40% Brix
Accuracy: 0.2 % Alcohol
0.2º Baumé
1 % Brix
Size: 27x40x160 mm
Model 50305052 (ECO series)
This instrument measures the probable de-
gree of alcohol in grape juice and degree
Baumé, thus allowing to estimate the ripeness
point of grapes before and during harvest. Wi-
thout automatic temperature compensation
(ATC). Calibration is made with distilled
water.
Scale:
0 - 25% Alcohol
0-22º Baumé
Accuracy: 0.2 % Alcohol
0.2º Baumé
Size: 27x40x160 mm
Model 50305120
A refractometer specially designed for me-
asuring the alcoholic strength in wine. It has
Automatic Temperature Compensation (10-
30º C). Calibration is made with distilled
water.
Scale: 0 - 25% Alcohol
Accuracy: 0.2 %
Size: 27x40x160 mm
Model 50305160
It is used to measure the alcohol degree
with 3 different scales, commonly used in dif-
ferent parts of the world. Calibration is made
with distilled water and it is provided with
Pag. 30
Manual 50100xxx
40
25
20
35
20
30
15
25
15
20
10
Baume
% Brix
10
15
10
5
5
5
0
0
0
% VOL
APPROXIMATE VALUE
DEGREE
ALCOHOL
Version 8 Jan-2015
Figure 4
The sample of liquid to be analysed is pla-
ced on the prism and then it is illuminated
with monochromatic or natural light (white
light). The light beam goes through the sam-
ple and the prism; then in the eyepiece we can
observe the prism surface up to find the
BOUNDARY LINE (the boundary line is the
refracted ray coming from a ray that has inci-
ded with an angle of 90º with the normal).
The reading is carried out dividing the eye-
piece field in a dark zone and a light zone. The
boundary line will determine both zones. All
the refracted rays come from incident rays
with an incident angle less than 90º.
Figure 5
incident
normal
rays
prism
sample
boundary line
Once the eyepiece field has been divided,
the value of the refractive index can be read
directly on the scale.
Before making any measurement, the ins-
trument must be calibrated with distilled
water (refractive index 1). For this purpose, a
drop of water must be placed on the prism of
the refractometer and make the necessary co-
rrection by turning the scale adjustment
screw.
A refractometer is an instrument that mea-
sure the concentration of aqueous solutions
by measuring the refractive index. All
aqueous solutions can be crossed by light. The
path length is proportional to its concentra-
tion.
Manual 50100xxx
Version 8 Jan-2015
dark zone
light
zone
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