3. General information
GB
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
3.1 Intended use
Betriebsanleitung
Analoges Brix Refraktometer
The refractometer is a measuring instrument for determining the refractive index of
transparent substances in the liquid or the solid state. It is used to observe the
behaviour of light as it passes from a prism with known properties to the substance
being tested.
Use of the refractometer for other purposes is contrary to its intended use and may
be hazardous. The manufacturer shall not be liable for any damages caused
by improper use.
Für hohe Konzentration
Operating manual
Analogue Brix Refractometer
KERN
ORA 62 BB
ORA 82 BB
Version 1.0
12/2014
Version 1.3
KERN & Sohn GmbH
01 / 2025
ORA 62 BA
82 BB
For high concentrations
KERN
Tel: +49- [0]7433-9933-0
Fax: +49- [0]7433-9933-149
Internet: www.kern-sohn.com
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
ORA_62BB_82BB-BA-d-1410
3.2 Warranty
The warranty shall be void in the event of:
▸ Failure to observe the instructions in the operating manual
▸ Use for purposes other than those described
▸ Modifications or opening the device housing
▸ Mechanical damage and/or damage resulting from media, liquids,
natural wear and tear
Contents
4. Basic safety information
1 technical data.................................................................................................1
2 Description......................................................................................................2
3 General information .......................................................................................3
3.1 Intended use ...................................................................................................3
3.2 Warranty..........................................................................................................3
4 Basic safety information ...............................................................................4
4.1 Follow the instructions in the operating manual .......................................4
4.2 Warning ........................................................................................................4-5
5 supplied items................................................................................................5
6 Before the first use ........................................................................................6
7 Use/measurement ........................................................................................6
7.1 Zero point calibration ................................................................................ 7-8
7.2 Additional advice............................................................................................9
7.3 Measuring procedure ...............................................................................9-10
8 Cleaning and maintenance ........................................................................ 11
9 storage ........................................................................................................ 11
10 service ........................................................................................................ 12
11 Disposal........................................................................................................ 12
12 Additional information................................................................................ 12
13 Brix to refractive index (nD) conversion table ......................................... 13
14 Annex ........................................................................................................ 14
4.1 Follow the instructions in the operating manual
1.Technical data
▸ Make sure that you will not be hit by anything else while you are using the
refractometer, as this could cause serious eye injuries
Models
KERN
Measuring
Skalenteilung
range and
Genauigkeit
1 Technische Daten
Scales
Mo d e lle
K ERN
oRA 62 BA
Abmessungen
Produkt
Mes s bereic h
und
S kalen-­‐
t eilung
Abmessungen
Produkt
Nettogewicht
Brix
4 5 -­‐8 2 % Brix
0 ,5 % Brix
137x40x40mm
0,135kg
S kalen
Genauig keit
28-62
0,2
% Brix
160x40x40mm 160x40x40mm
0,140kg
O R A % Brix
2 8 -­‐6 2 % 0 ,2 % Brix
6 2 BB
ORA
8 2 BB
ORA 82 BB
45-82 % Brix
0,5 % Brix
137x40x40mm
▸ Carefully read through the operating manual even if you have prior
experience with KERN refractometers.
▸ Every language version includes a non-authoritative translation.
The original German document is the definitive version.
4.2 Warning
▸ Do not let acids come into contact with skin or eyes. If acid comes into contact
with skin, flush with copious amounts of water. Shower if larger areas of skin are
affected.
▸ If acid comes into contact with eyes, keep the eyelid open and flush the eye with
running lukewarm water from the outer corner to the inner corner. Flush eyes for
at least 15 minutes. Then consult a doctor or ophthalmologist immediately.
▸ Thoroughly clean the refractometer after each use.
▸ The refractometer must not be exposed to extreme temperatures, high
mechanical stresses, strong direct sunlight or high humidity.
Nettogewicht
▸ The rubber eyeshade may cause irritation when in prolonged contact with the
skin. If this happens, consult your doctor.
▸ Do not touch the lenses with your fingers.
0,140kg
5. supplied items
0,135kg
Example scale on
ORA 82 BB
Gerätebeschreibung
4
4
▸ This refractometer is not a toy. Keep out of reach of children.
Beispielder Skala für den ORA 82 BB
3
3
1
After unpacking and before using the device for the first time, check that all
listed parts have been supplied. Replace damaged or faulty parts immediately
and do not put them into operation.
▸ Refractometer
▸ Storage box
▸ Pipette
▸ Adjustment tool
▸ Cleaning cloth
▸ Calibration block + Contact liquid (Clove oil) (ORA 82 BB)
▸ Calibration liquid (Saturated salt solution) (ORA 62 BA)
5
2
6. Before the first use
2. Description
Gerätebeschreibung
1
3
2
1
5
3
4
6
1.
2.
3.
4.
5.
6.
Prismenabdeckung
Prismenfläche
Justierschraube
Okular mit Gummi-Augenmuschel
Einstellring des Diopters
6
Optische Röhre mit Gummigriff
1.
2.
3.
4.
5.
6.
9
Prismenabdeckung
Prismenfläche
8
Justierschraube
Okular mit Gummi-Augenmuschel
Einstellring des Diopters
Optische Röhre mit Gummigriff
5
10
11
9
7
12
8
7. Aufbewahrungsbox
1.
2.
3.
4.
5.
6.
Prism cover
Prism surface
Adjustment screw
Eyepiece with rubber eyeshade
Diopter adjustment ring
Optical tubes with rubber grip
ORA_62BB_82BB-BA-d-1410
7. Storage box
8. Pipette
9. Refractometer
10. Calibration / contact liquid
(Saturated salt solution / clove oil)
11. Adjustment tool
12. Cleaning cloth
2
10
Remove the protective film (if present) from the prism surface [2] and check that
the rubber eye-cup [4] is fitted correctly.
7. Use/measurement
The refractometer can be used to quickly and accurately determine the refractive
index of transparent substances, liquid or solid ones. To ensure correct measurement, the measuring device should be adjusted before measurements are carried
out. Please make sure your hands are dry before handling the measuring device.
Important! (ORA 82 BB)
!
Avoid bringing the supplied contact liquid (clove oil) into contact with the prism
cover [1]. Even the smallest amounts of clove oil will damage the material of the
cover and lead to its opacification.
Therefore, pay big attention to this aspect while carrying out the adjustment of the refractometer
described below.
If still there is accidentally contact between clove oil and the prism cover, it would not affect
subsequent measurement operations even when high opacification occurs.
6
7.1 Zero point calibration
8. Cleaning and maintenance
▸ Hold up the refractometer against a sufficiently bright light source and look through
the eyepiece [5], holding the rubber eyeshade [4] closely against your eye/glasses.
▸ Rotate the eyepiece [5] to adjust it for your eyesight, until you can see the scale
sharply.
▸ Open the prism cover [1].
▸ Thoroughly clean the prism [2] and the underside of the prism cover [1] using a soft
cloth or soft paper (with alcohol if necessary) and wipe dry.
▸ ORA 62BA: Now apply a few drops of calibration liquid [10] onto the prism surface [2]. The
amount of fluid should be sufficient to moisten most of the prism surface.
ORA 82BB: Moisten the polished surface of the calibration block with the contact fluid. Now
put the block with the moistened surface downward onto the prism surface [2].
▸ Close the prism cover [1]. The amount of fluid should be sufficient to moisten most
of the prism surface. There should not be any air bubbles between the measuring
prism [2] and prism cover [1].
▸ Wait about 30 seconds to allow the temperatures of the fluid and prism to equalise.
Clean the refractometer using a soft, 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 [2] with hard tools made from plastic, wood,
rubber, metal, glass etc. Hard objects can quickly damage the relatively soft prism
glass, resulting in measurement errors.
The refractometer is maintenance-free.
Cleaning should be carried out immediately before and after each use of the refractometer to maximise its life and optimise measurement results.
9.Storage
▸ Look through the eyepiece [4] while pointing the refractometer‘s prism surface [2]
7
at a bright light source.
▸ Through the eyepiece [4], you will see a bright and a blue field. The boundary line
between them shows the measured value on the scale which is also visible
through the eyepiece [4].
▸ Use the supplied adjustment tool [11] to turn the adjustment screw [3] behind
the prism surface [2] (under the rubber cap), and adjust the scale so that the
measuring device is optimally set up by moving the boundary line upwards or downwards.
Calibration value ORA 62BA: 29,6 % (Brix) (See the calibration line in the scale)
Calibration value ORA 82BBB: 78,8 % (Brix) (See the calibration line in the scale)
▸ Repeat step 4 (cleaning).
After 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
authorised by KERN.
11. Disposal
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.
!
The ambient/room temperature and the sample temperature influ-ence
the refractometer measuring result. The scales of the refractometer
models, which have "BB" in its name, are designed for an ambient
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 "BA" in its name, are equipped with an automatic
temperature compensation (ATC). Between +10°C and +30°C measurement differences due to
temperature changes are automatically compensated.
12. Additional information
The product may differ slightly from the illustrations. Avoid exposing the refractometer to direct sunlight. Never bring the refractometer into contact with solvents.
13. Brix to refractive index (nD) conversion table
After every measurement, use a lint-free, absorbent cloth to remove
the fluids from the prism surface [2] and prism cover [1]. Then
carefully clean the prism and prism cover using a cloth moistened
with water or if necessary alcohol, and dry both parts using a soft,
dry and lint-free cloth. Avoid rubbing the prism [2].
!
10
1.50398 1.43967 1.37758 1.37936 28 29 59 1.37582 27 58 1.43743 85 1.43520 1.43299 1.43080 1.37406 26 57 1.37233 25 56 1.37060 55 1.49862 1.50129 84 1.42862 1.49597 24 54 83 82 1.42432 1.42647 53 52 1.36720 1.36889 23 1.36551 21 22 1.4881 1.49071 1.49333 81 1.42220 1.48552 1.36384 20 51 79 80 1.42009 1.41799 1.36218 19 50 1.48295 1.36054 18 49 78 1.41592 1.48040 1.35891 17 48 77 1.41385 1.47787 1.35729 16 47 76 1.41181 1.47535 1.35568 15 46 75 1.40978 1.47285 1.47037 1.35408 14 45 74 1.40776 1.46792 1.35250 13 44 72 71 73 1.40576 1.40378 1.40181 1.35093 12 43 1.34937 11 42 1.34782 10 41 1.46303 1.46546 70 1.39986 1.46061 1.34629 9 40 69 1.39792 1.45822 1.34476 8 39 68 1.39600 1.45584 1.45348 1.34325 7 38 67 1.39409 1.45113 1.34175 6 37 65 66 1.39220 1.39032 1.34026 5 36 1.33879 4 35 1.44881 63 64 1.38846 1.38661 1.33732 3 34 1.33586 2 33 1.44650 1.44420 61 62 1.38478 1.38296 1.33442 1 31 nD 1.33299 32 60 1.38115 % 0 30 Refractive index nD BRIX Refractive index % 12
13
14. Annex
Table 1: International Temperature Correction Table for °Brix (% sugar gradient)
14Correct
Annex the result by the following values (refractometer must be correctly
Table 1: International Temperature Correction Table for °Brix (% sugar gradient)
adjusted at 20 °C).
Correct the result by the following values (refractometer must be correctly adjusted at 20 °C)
Temperature °C
Important!
BRIX Refractive index ▸ The boundary line will move on the measurement scale depending on the concen- 9
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
correction table [13].
▸ Carefully clean the supplied pipette [8] and the refractometer after carrying out
the measurement.
BRIX ▸ Make sure your hands are dry before handling the refractometer.
▸ Open the prism cover [1] and use the supplied pipette [8] to apply a few drops of
the sample liquid [8] onto the prism surface [2]. Close the prism cover [1]. Spread
the liquid evenly by pressing down on the prism cover [1] and elimi-nate any air
bubbles present.⇨
▸ Hold the device horizontally and wait about 30 seconds (for optimal tempera-ture
equalisation between the sample and device).
▸ View the measurement scale through the eyepiece [4]. Point the prism surface [2]
of the refractometer at a bright light source while doing this.
▸ Rotate the adjustment ring [5] on the eyepiece [4] to adjust the focus.
13 Brix to refractive index (nD) conversion table
7.3 Measuring procedure
nD 7.2 Additional advice
1.44193 Data from „ICUMSA“ International Commission for Uniform Methods
of Sugar Analysis, at 20 °C and 589 nm wavelength.
8
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.
11
10.Service
% Important!
Store the refractometer in a dry, non-corrosive environment, preferably
between 10 °C and 30 °C.
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
% Brix
reading
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
-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
-0.74
-0.49
-0.52
-0.54
-0.57
-0.59
-0.61
-0.63
-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
-0.40
-0.41
-0.43
-0.45
-0.47
-0.48
-0.50
-0.51
-0.52
-0.52
-0.53
-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
0.77
0.75
-0.75
-0.73
14
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