3. General information
GB
3.1 Intended use
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
Operating manual
Analogue refractometer
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
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.
Betriebsanleitung
Analoges Refraktometer
KERN
ORA 4 RR Analog nD
(research special
Liquids)
KERN ORA 4 RR Analogue nD
(research special
liquids)
Version 1.1
KERN & Sohn GmbH
05/2016
Version 1.0
12/2014
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_4RR-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
2
3
3.1
3.2
4
4.1
4.2
5
6
7
7.1
7.2
7.3
8
9
10
11
12
13
4.1 Follow the instructions in the operating manual
Technical data.................................................................................................1
Description......................................................................................................2
General information........................................................................................3
Intended use....................................................................................................3
Warranty..........................................................................................................3
Basic safety information................................................................................4
Follow the instructions in the operating manual........................................4
Warning........................................................................................................4-5
Supplied items.................................................................................................5
Before the first use.........................................................................................6
Use/measurement.........................................................................................6
Zero point calibration.................................................................................7-8
Additional advice.............................................................................................9
Measuring procedure............................................................................... 9-10
Cleaning and maintenance.......................................................................... 11
Storage.......................................................................................................... 11
Service.......................................................................................................... 12
Disposal......................................................................................................... 12
Additional information................................................................................. 12
Annex....................................................................................................... 13-14
▸ 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.
Mes s bereic h
und
S kalen
nD: 1 ,4 4 0 -­‐
1 ,5 2 0
S kalen-­‐
t eilung
Genauig keit
0 ,0 0 1 nD
Models
KERN
Measuring range
and Scales
Scale graduations Accuracy
ORA 4 RR
RI: 1,440-1,520 nD
0,001 nD
ORA 4 RR
Beispiel der Skala für den ORA 4 RR
Abmessungen
Produkt
Nettogewicht
137x40x40mm
0,135kg
Dimensions
Product
▸ Make sure that you will not be hit by anything else while you are using the
refractometer, as this could cause serious eye injuries
Net weight
137x40x40mm
4
▸ This refractometer is not a toy. Keep out of reach of children.
1. Technical data
1 Technische Daten
Mo d e lle
K ERN
3
▸ 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.
0,135kg
Example scale on
ORA 4 RR
5. supplied items
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.
2 Gerätebeschreibung
3
4
1
2
5
3
4
6
2
1.
2.
3.
4.
5.
6.
1
1.
2.
3.
4.
5.
6.
3
Prismenabdeckung
Prismenfläche
Justierschraube
Okular mit Gummi-Augenmuschel
Einstellring des Diopters 6
Optische Röhre mit Gummigriff
9
Prismenabdeckung
Prismenfläche
Justierschraube
8
Okular mit Gummi-Augenmuschel
Einstellring des Diopters
Optische Röhre mit Gummigriff
5
10
11
9
7
5
6. Before the first use
2. Description
Gerätebeschreibung
1
▸ Refractometer
▸ Storage box
▸ Pipette
▸ Adjustment tool
▸ Cleaning cloth
▸ Calibration block + Contact liquid (Clove oil)
12
8
7. Aufbewahrungsbox
8. Pipette
10
1.
2.
3.
4.
5.
6.
Remove the protective film (if present) from the prism surface [2] and check that
the rubber eye-cup [4] is fitted correctly.
Prism cover
Prism surface
Adjustment screw
ORA_4RR-BA-d-1410
Eyepiece with rubber eyeshade
Diopter adjustment ring
Optical tubes with rubber grip
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.
7. Storage box
8. Pipette
9. Refractometer
10. Contact liquid
(Clove oil)
11. Adjustment tool
12. Cleaning cloth
Important!
2
!
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 maintenanceg
▸▸ 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. Water should only ever
be applied to the measuring prism, not to other parts of the device.
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.
▸ 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
block surface. There should not be any air bubbles between the measuring prism [2] and
calibration block.
▸ Wait about 30 seconds to allow the temperatures of the fluid and prism to equalise.
▸ Look through the eyepiece [4] while pointing the refractometer‘s prism surface [2]
at a bright light source.
▸ Through the eyepiece [4], you will see a bright and a blue field. The boundary line 7
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: 1,4875 nD (Refractive Index) (See the calibration line in the scale)
▸▸ For refractometers without automatic temperature compensation (ATC): Convert
the measured value to take account of the deviation in room and sample temperature from +20 °C. (See the table at the end of this manual, point 13.)
▸▸ Repeat step 4 (cleaning).
Store the refractometer in a dry, non-corrosive environment.
11
10. Service
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 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. We reserve the right to
make changes to reflect technical advancements, decorations not included.
Avoid exposing the refractometer to direct sunlight!
Never bring the refractometer into contact with solvents.
8
10
0.68
0.60
0.75
0.77
0.69
0.70
0.78
0.79
0.71
0.72
0.80
0.81
0.72
0.73
0.81
0.82
0.81
0.81
0.73
0.72
0.81
0.80
0.71
0.70
0.79
0.78
0.69
0.67
0.75
0.66
0.74
0.68
13
0.77
0.73
0.73
0.81
0.52
0.65
0.59
0.58
0.60
0.61
0.62
0.63
0.64
0.64
0.64
0.65
0.73
0.61
0.62
0.63
0.64
0.64
0.46
0.56
0.51
0.50
0.52
0.53
0.54
0.55
0.55
0.56
0.56
0.56
0.64
0.53
0.54
0.55
0.55
0.56
0.37
0.48
0.43
0.42
0.44
0.45
0.46
0.46
0.47
0.47
0.48
0.48
0.56
0.46
0.46
0.47
0.47
0.48
0.30
0.40
0.35
0.34
0.36
0.37
0.38
0.38
0.39
0.39
0.40
0.40
0.48
0.38
0.39
0.39
0.39
0.40
0.22
0.32
0.28
0.27
0.29
0.29
0.30
0.30
0.31
0.31
0.31
0.32
0.40
0.30
0.31
0.31
0.31
0.32
0.15
0.24
0.21
0.20
0.21
0.22
0.22
0.23
0.23
0.23
0.23
0.24
0.32
0.23
0.23
0.23
0.23
0.24
0.07
0.00
0.16
0.14
0.13
0.14
0.14
0.15
0.15
0.15
0.15
0.16
0.16
0.24
0.15
0.15
0.15
0.16
0.16
-0.07
0.08
0.16
0.08
0.00
0.00
0.08
0.08
0.00
0.00
0.08
0.08
0.00
0.00
0.08
0.08
0.08
0.00
0.00
0.08
0.07
0.00
0.00
0.07
0.07
0.00
0.07
0.06
0.00
0.00
0.00
0.07
0.00
0.00
0.08
-0.15
-0.08
-0.06
-0.06
-0.07
-0.07
-0.07
-0.07
-0.07
-0.08
-0.08
-0.08
0.00
-0.08
-0.08
-0.08
-0.08
-0.08
-0.22
-0.15
-0.13
-0.12
-0.13
-0.14
-0.14
-0.14
-0.15
-0.15
-0.15
-0.15
-0.08
-0.15
-0.15
-0.15
-0.15
-0.15
-0.30
-0.23
-0.19
-0.18
-0.20
-0.20
-0.21
-0.21
-0.22
-0.22
-0.23
-0.23
-0.15
-0.23
-0.23
-0.23
-0.23
-0.23
-0.37
-0.31
-0.25
-0.24
-0.26
-0.27
-0.28
-0.28
-0.29
-0.30
-0.30
-0.30
-0.23
-0.30
-0.30
-0.31
-0.31
-0.31
-0.44
-0.38
-0.31
-0.29
-0.32
-0.33
-0.34
-0.35
-0.36
-0.37
-0.37
-0.38
-0.31
-0.37
-0.38
-0.38
-0.38
-0.38
-0.52
-0.45
-0.36
-0.34
-0.38
-0.39
-0.40
-0.42
-0.43
-0.44
-0.44
-0.45
-0.38
-0.45
-0.45
-0.46
-0.46
-0.46
-0.59
-0.66
-0.41
-0.40
-0.43
-0.45
-0.47
-0.48
-0.50
-0.51
-0.52
-0.53
-0.46
-0.52
-0.53
-0.53
-0.53
-0.53
-0.73
-0.52
-0.53
-0.67
-0.74
-0.60
-0.60
-0.75
-0.67
-0.68
-0.75
-0.60
-0.61
-0.75
-0.68
-0.68
-0.75
-0.61
-0.60
-0.60
-0.59
-0.68
-0.67
-0.66
-0.75
-0.74
-0.73
-0.58
-0.72
-0.65
-0.64
-0.71
-0.57
-0.56
-0.69
-0.63
-0.61
-0.67
-0.55
-0.53
-0.65
-0.59
-0.57
-0.62
-0.51
-0.49
-0.47
-0.44
-0.54
-0.52
-0.49
!
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
▸▸ If the temperature deviates from +20 °C, 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.
-0.59
▸▸ 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.
-0.56
▸▸ 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 [4]. Point the prism surface [2]
of the refractometer at a bright light source while doing this.
9
▸▸ Rotate the adjustment ring [5] on the eyepiece [4] to adjust the focus.
Table 1: International Temperature
Correction Table
for °Brix (% sugar
gradient)
Correct the result by
the following values
(refractometer must
be correctly
calibrated at 20 °C).
-0.53
▸▸ 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] and eliminate any
air bubbles present.
13. Annex
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
7.3 Measuring procedure
12
% Brix
reading
0.0
5.0
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.
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].
9. Storage
11. Disposal
7.2 Additional advice
Important!
Cleaning should be carried out immediately before and after each use of the
refractometer to maximise its life and optimise measurement results.
13 Annex
Table 1: International Temperature Correction Table for °Brix (% sugar gradient)
Correct the result by the following values (refractometer must be correctly calibrated at 20 °C)
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 13.
The refractometer is maintenance-free.
Temperature °C
Important!
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.
14
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