3. General information
GB
3.1 Intended use
KERN & Sohn GmbH
Operating manual
Betriebsanleitung
Analogue refractometer Analoges Refraktometer
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
KERN
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
ORA 90 BE Analog Expert
3-fach Skala Brix
Analog Expert
3-fach Skala nD
KERN ORA 90 BE Analogue Expert 3x Brix scale
ORA 1 RE Analogue Expert 3x nD scale
ORA 1 RE
Version 1.0
12/2014
KERN & Sohn GmbH
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]
Version 1.2 04/2019
KERN
Contents
1
2
3
3.1
3.2
4
4.1
4.2
5
6
7
7.1
7.2
8
9
10
11
12
13
14
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
3
4.1 Follow the instructions in the operating manual
ORA_90BE_1RE-BA-d-1410
▸▸ 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 immetdiately.
▸▸ 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.
Measuring range
and Scales
Scale graduations Accuracy
1 Technical data
Brix: 0-42%
0,2 % Brix
Brix: 42-71%
0,2 % Brix
Brix: 71-90%
0,2 % Brix
Models
KERN
ORA 90BE
RI: 1,3331,5200 nD
ORA 1RE
ORA 1RE
4
▸▸ This refractometer is not a toy. Keep out of reach of children.
1.Technische Daten
ORA 90BE
3.2 Warranty
4. Basic safety information
Technical data..................................................................................................1
Description......................................................................................................2
General information........................................................................................3
Intended use....................................................................................................3
Intended use....................................................................................................3
Basic safety information.................................................................................4
Follow the instructions in the operating manual...........................................4
Warranty...................................................................................................... 4-5
Supplied items.................................................................................................5
Before the first use..........................................................................................6
Use/measurement..........................................................................................7
Additional advice.............................................................................................8
Measuring procedure.................................................................................. 8-9
Cleaning and maintenance........................................................................... 10
Storage.......................................................................................................... 10
Service.......................................................................................................... 11
Disposal........................................................................................................ 11
Additional information................................................................................. 12
Brix to refractive index (nD) conversion table........................................12-13
Annex............................................................................................................ 14
Models
KERN
The refractometer is a measuring instrument for determining the refractive index of
transparent substances in liquid or in some cases also in 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.
Measuring range
and
Scales
Brix: 0-­‐42%
Brix: 42-­‐71%
Brix: 71-­‐90%
nD: 1.333-­‐
1.5200
Net weight
200x40x40mm
0,600kg
▸▸ Do not touch the lenses with your fingers.
0,600kg
5.Supplied items
Scale gradua-­‐
tions
Accuracy
Dimensions
Product
0.2 % Brix
0.2 % Brix
0.2 % Brix
0.005 nD
200x40x40mm
0,005 nD
▸▸ Make sure that you will not be hit by anything else while you are using the refractometer, as this could cause serious eye injuries
Dimensions
Product
Net weight
0.600kg
200x40x40mm
200x40x40mm
▸▸ The rubber eyeshade may cause irritation when in prolonged contact with the
skin. If this happens, consult your doctor.
0.600kg
Example scale on the ORA 90 BE
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.
Example scale on
ORA 90 BE
▸▸ Refractometer
▸▸ Storage box
▸▸ Pipette
▸▸ Tools
▸▸ Cleaning cloth
Gerätebeschreibung
1
1
5
4
2. Description
Gerätebeschreibung
6. Before the first use
5
3
2
1
2
6
3
4
1.
2.
3.
4.
5.3
6.
Prismenabdeckung
Prismenfläche
Messbereich Verstellrad
Dispersions – Einstellring
Optische Röhre
Okular mit Einstellring des Diopters
1.
2.
3.
4.
5.
6.
Prismenabdeckung
9
Prismenfläche
Messbereich
8 Verstellrad
Dispersions – Einstellring
Optische Röhre
Okular mit Einstellring des Diopters
5
6
10
1.
2.
3.
4.
5.
6.
ORA_90BE-BA-e-1510
Prism cover
Prism surface
Adjusting wheel measuring range
Dispersion adjusting ring
Optical tubes
Eyepiece with diopter
adjustment ring
Remove the protective film (if present) from the prism surface [2] and move the
measuring range adjusting wheel [3] to position 1.
!
7. Storage box
8. Pipette
9. Refractometer
10. Tools
11. Cleaning cloth
The refractometer cannot be used for the measurement of oil-based fluids.
9
7
8
7. Aufbewahrungsbox
11
2
6
7. Use/measurement
10.Service
▸▸ The refractometer can be used to quickly and accurately determine the refractive
index of transparent substances, liquid or solid ones. Please make sure your hands
are dry before handling the measuring device.
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.
▸▸ The measuring instrument has three measuring ranges. Please use the measuring
range adjusting wheel on the underside of the casing to switch measuring ranges.
11. Disposal
▸▸ The light falling on the prism can be changed using a rotating flap on the underside
of the prism.
▸▸ In addition, the refractometer is provided with an adjusting ring [4], which can
reduce chromating, primarily with low liquid concentrations.
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 light/dark transition is clearly visible.
Important!
!
The ambient/room temperature and the sample temperature influence
the refractometer measuring result.
The scales 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.
11
7
7.1 Additional advice
12. Additional information
It is important that the samples being measured are representative samples.
Measurements should be carried out quickly on samples that evaporate easily. The
samples should be at the same temperature as the measuring instrument in order
to achieve an accurate result.
The product may differ slightly from the illustrations.
Avoid exposing the refractometer to direct sunlight!
Never bring the refractometer into contact with solvents.
7.2 Measuring procedure
1.43967 1.43743 1.37936 29 59 1.37758 28 58 1.37582 27 9
8. Cleaning and maintenance
Clean the refractometer using a soft, lint-free cloth moistened with 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.
13
14. Annex
Table 1: International Temperature Correction Table for °Brix (% sugar gradient)
correctly
14 Annex
the Temperature result by the
following
refractometer
must be
TableCorrect
1: International
Correction Table forvalues
°Brix (% (sugar
gradient)
Correct
the result byat
the 20
following
calibrated
°C). values (refractometer must be correctly calibrated at 20 °C)
The refractometer is maintenance-free.
Temperature °C
Cleaning should be carried out immediately before and after each use of the
refractometer to maximise its life and optimise measurement results.
9.Storage
Store the refractometer in a dry, non-corrosive environment, preferably between
10°C and 30 °C.
10
Data from "ICUMSA" International Commission for Uniform Methods
of Sugar Analysis, at 20 °C and 589 nm wavelength.
1.50398 1.43520 1.37406 26 57 1.50129 1.37233 56 1.43299 85 1.43080 1.49862 25 55 84 1.42862 1.37060 24 54 1.49333 1.49597 82 81 83 1.42647 1.42432 1.42220 1.36889 23 53 1.36720 22 52 1.36551 21 51 1.4881 1.49071 80 79 1.41799 1.42009 1.36384 20 50 1.36218 19 49 1.48552 1.48295 1.48040 76 77 78 1.41592 1.41385 1.41181 1.36054 18 46 1.35891 17 48 1.35729 16 47 1.47535 1.47285 1.47037 1.47787 75 1.40978 1.35568 15 45 74 72 73 1.40576 1.40378 1.40776 44 42 43 1.35250 1.35093 1.35408 14 12 12
13 1.46303 1.46792 71 1.40181 1.34937 11 41 1.46061 1.46546 70 69 1.39792 1.34629 1.34782 9 10 39 1.39986 1.45822 38 1.34476 40 68 1.45584 1.45348 8 1.39600 67 1.34325 1.39409 1.45113 7 37 65 66 1.39220 1.34175 1.39032 1.34026 6 36 1.44881 5 35 64 1.38846 1.33879 4 34 1.44420 1.44650 62 61 63 1.38661 1.38478 1.38296 1.33732 3 33 1.33586 2 32 1.33442 1 31 nD 1.44193 60 1.33299 1.38115 Refractive index 0 30 % BRIX Refractive index nD % nD BRIX Refractive index !
% 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].
Data from „ICUMSA“ International Commission for Uniform Methods
of Sugar Analysis, at 20 °C and 589 nm wavelength.
BRIX Important!
13. Brix to refractive index (nD) conversion table
13 Brix to refractive index (nD) conversion table
▸▸ 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], then close the prism cover [1].
Spread the liquid evenly by pressing down on the prism cover [1].
▸▸ Hold the device horizontally and wait about 30 seconds (for optimal temperature
equalisation between the sample and device).
▸▸ View the measurement scale through the eyepiece [6]. Point the prism surface [2]
of the refractometer at a bright light source while doing this.
▸▸ The light falling on the prism can be changed using a rotating flap on the
underside of the prism.
8
▸▸ Rotate the adjustment ring [6] on the eyepiece [6] to adjust the focus.
▸▸ The boundary line will move on the measurement scale depending on the concentration. This bright/dark boundary line shows the result directly on the scale.
▸▸ The measuring instrument has three measuring ranges. Please use the measuring
range adjusting wheel on the underside of the casing to switch measuring ranges.
▸▸ The light/dark boundary can be brought into sharp focus using the dispersion
adjusting ring [6]. This is useful for low liquid concentrations.
▸▸ If the temperature deviates from +20 °C, correct the measured result using the
corresponding value from the temperature correction table (Point 14).
▸▸ Carefully clean the supplied pipette [8] and the refractometer after carrying out
the measurement.
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
-0.75
-0.74
-0.73
-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
0.20
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
0.50
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
0.15
0.46
14
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