7.1 Zero point calibration
▸ Hold up the refractometer against a sufficiently bright light source and look through
, holding the rubber eyeshade
closely against your eye/glasses.
to adjust it for your eyesight, until you can see the scale
▸ Thoroughly clean the prism
and the underside of the prism cover
with alcohol if necessary
▸ Now apply a few drops of the calibration liquid
. The amount of fluid should be sufficient to moisten most
of the prism surface. There should not be any air bubbles between the measuring
▸ Wait about 30 seconds to allow the temperatures of the fluid and prism to
▸ Look through the eyepiece
while pointing the refractometer‘s prism surface
at a bright light source.
, you will see a bright and a blue field. The boundary line
between them shows the value on the scale which is also visible measured
▸ Use the supplied adjustment tool
to turn the adjustment screw
, and adjust the scale so that the
measuring device is optimally set up by moving the boundary line upwards or downwards.
Calibration value ORA 1WA/1WB: 0 % (Brix) / 0 °Oe (Oechsle) / 0 °KMW (KMW Babo)
Calibration value ORA 3WA/3WB: 0 % (Brix)
Calibration value ORA 7WA/7WB: 0 % (Brix) / 0 °Oe (Oechsle) / 0 °KMW (KMW Babo)
Calibration value ORA 2AB: 0 % ( )w/w
The ambient/room temperature and the sample temperature influ-ence the
refractometer measuring result. The scales of the refractometer models,
which have " B " in its name, are designed for an ambient W / AB
It is important that the samples being measured are representative samples. For
samples that evaporate easily, measurements should be carried out quickly. The
samples should be at the same temperature as the measuring instrument in order
to achieve an accurate result.
▸ Make sure your hands are dry before handling the refractometer.
and use the supplied pipette
the liquid evenly by pressing down on the prism cover
▸ Hold the device horizontally and wait about 30 seconds
equalisation between the sample and device
▸ View the measurement scale through the eyepiece
. Point the prism surface
of the refractometer at a bright light source while doing this.
▸ Rotate the adjustment ring
▸ The boundary line will move on the measurement scale depending on the concen-
tration. This bright/dark boundary line shows the result on the scale.
▸ If the temperature deviates from +20 °C , and a refractometer without ATC is used
correct the measured result using the corresponding value from the temperature
▸ Carefully clean the supplied pipette
and the refractometer aer carrying out
Aer every measurement, use a lint-free, absorbent cloth to remove
the fluids from the prism surface
carefully clean the prism and prism cover using a cloth moistened
with water or if necessary alcohol, and dry both parts using a so,
dry and lint-free cloth. Avoid rubbing the prism
BRIX
Refractive
index BRIX
Refractive
index BRIX
Refractive
index
0 1.33299 30 1.38115 60 1.44193
2 1.33586 32 1.38478 62 1.44650
3 1.33732 33 1.38661 63 1.44881
4 1.33879 34 1.38846 64 1.45113
5 1.34026 35 1.39032 65 1.45348
6 1.34175 36 1.39220 66 1.45584
7 1.34325 37 1.39409 67 1.45822
8 1.34476 38 1.39600 68 1.46061
9 1.34629 39 1.39792 69 1.46303
10 1.34782 40 1.39986 70 1.46546
11 1.34937 41 1.40181 71 1.46792
12 1.35093 42 1.40378 72 1.47037
13 43 1.40576 73 1.35250 1.47285
14 1.35408 44 1.40776 74 1.47535
15 1.35568 45 1.40978 75 1.47787
16 46 1.41181 76 .48040 1.35729 1
17 1.35891 47 1.41385 77 1.48295
18 1.36054 48 1.41592 78 1.48552
19 49 1.41799 79 1.4881 1.36218
20 1.36384 50 1.42009 80 1.49071
21 1.36551 51 1.42220 81 1.49333
22 1.36720 52 1.42432 82 1.49597
24 1.37060 54 1.42862 84 1.50129
25 1.37233 55 1.43080 85 1.50398
26 1.37406 56 1.43299
27 1.37582 57 1.43520
28 1.37758 58 1.43743
29 1.37936 59 1.43967
8. Cleaning and maintenance
Clean the refractometer using a so, lint-free cloth moistened with either water
or, if necessary, alcohol. Do not use any aggressive or abrasive cleaning agents.
Never immerse the device in water or hold it under running water. Never handle the
device with wet or damp hands.
Never touch the measuring prism
with hard tools made from plastic, wood,
rubber, metal, glass etc. Hard objects can quickly damage the relatively so prism
glass, resulting in measurement errors.
The refractometer is maintenance-free.
Cleaning should be carried out immediately before and aer each use of the refrac-
tometer to maximise its life and optimise measurement results.
Store the refractometer in a dry, non-corrosive environment, preferably
Aer reading this operating manual, if you have any questions about setting up
or using the refractometer, or if any unexpected problem occurs, please contact
your dealer. The device housing may only be opened by trained service technicians
The packaging consists of environmentally friendly materials which can be disposed
of via local recycling facilities.
The device and storage box should be disposed of by the operator in accordance
with applicable national or regional regulations at the place of use.
12. Additional information
The product may differ slightly from the illustrations. Avoid exposing the refracto-
meter to direct sunlight. Never bring the refractometer into contact with solvents.
13. Brix to refractive index (nD) conversion table
Data from „ICUMSA“ International Commission for Uniform Methods
of Sugar Analysis, at 20 °C and 589 nm wavelength.
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0
Temperature °C
- - - - - - - - - - - - - - - - - - 0.53 0.56 0.59 0.62 0.65 0.67 0.69 0.71 0.72 0.73 0.74 0.75 0.75 0.75 0.75 0.75 0.74 0.73
- - - - - - -0 - - - - - - - - - - - 0.49 0.52 0.54 0.57 0.59 0.61 .63 0.64 0.65 0.66 0.67 0.68 0.68 0.68 0.68 0.67 0.67 0.66
- - - - - - - - - - - - - - - - - - 0.44 0.47 0.49 0.51 0.53 0.55 0.56 0.57 0.58 0.59 0.60 0.60 0.61 0.61 0.60 0.60 0.60 0.59
- - - - - - - - - - - 3 - - - - - - - 0.40 0.41 0.43 0.45 0.47 0.48 0.50 0.51 0.52 0.52 0.5 0.53 0.53 0.53 0.53 0.53 0.52 0.52
- - - - - - - - - - - - - - - - - - 0.34 0.36 0.38 0.39 0.40 0.42 0.43 0.44 0.44 0.45 0.45 0.46 0.46 0.46 0.46 0.45 0.45 0.44
- - - - - - - - - - - - - - - - - - 0.29 0.31 0.32 0.33 0.34 0.35 0.36 0.37 0.37 0.38 0.38 0.38 0.38 0.38 0.38 0.38 0.37 0.37
- - - - - - - - - - - - - - - - - - 0.24 0.25 0.26 0.27 0.28 0.28 0.29 0.30 0.30 0.30 0.31 0.31 0.31 0.31 0.31 0.30 0.30 0.30
- - - - - - - - - - - - - - - - - - 0.18 0.19 0.20 0.20 0.21 0.21 0.22 0.22 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.23 0.22
- - - - - - - - - - - - - - - - - - 0.12 0.13 0.13 0.14 0.14 0.14 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15
- - - - - - - - - - - - - - - - - - 0.06 0.06 0.07 0.07 0.07 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.07
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.06 0.07 0.07 0.07 0.07 0.07 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.07
0.13 0.14 0.14 0.14 0.15 0.15 0.15 0.15 0.16 0.16 0.16 0.16 0.16 0.16 0.15 0.15 0.15 0.15
0.20 0.21 0.21 0.22 0.22 0.23 0.23 0.23 0.23 0.24 0.24 0.24 0.24 0.23 0.23 0.23 0.23 0.22
0.27 0.28 0.29 0.29 0.30 0.30 0.31 0.31 0.31 0.32 0.32 0.32 0.32 0.31 0.31 0.31 0.30 0.30
0.34 0.35 0.36 0.37 0.38 0.38 0.39 0.39 0.40 0.40 0.40 0.40 0.40 0.39 0.39 0.39 0.38 0.37
0.42 0.43 0.44 0.45 0.46 0.46 0.47 0.47 0.48 0.48 0.48 0.48 0.48 0.47 0.47 0.46 0.46 0.46
0.50 0.51 0.52 0.53 0.54 0.55 0.55 0.56 0.56 0.56 0.56 0.56 0.56 0.55 0.55 0.54 0.53 0.52
0.58 0.59 0.60 0.61 0.62 0.63 0.64 0.64 0.64 0.65 0.65 0.64 0.64 0.64 0.63 0.62 0.61 0.60
0.66 0.67 0.68 0.69 0.70 0.71 0.72 0.73 0.73 0.73 0.73 0.73 0.72 0.72 0.71 0.70 0.69 0.68
0.74 0.75 0.77 0.78 0.79 0.80 0.81 0.81 0.81 0.82 0.81 0.81 0.81 0.80 0.79 0.78 0.75 0 .77
Table 1: International Temperature Correction Table for °Brix
Correct the result by the following values
refractometer must be correctly
temperature of +20 °C! If the measurements are carried out at a temperature other than +20 °C,
the results must be correspondingly corrected. A correction table can be found in the annex,
Point 14. Refractometer models, which have " A" in its name, are equipped with an automatic W
temperature compensation (ATC). Between +10°C and +30°C measurement differences due to
temperature changes are automatically compensated.
