KERN ORA 4 RR Manuel utilisateur

ORA_4RR-BA-e-1510

KERN & Sohn GmbH

Ziegelei 1

D-72336 Balingen, Germany

E-mail: info@kern-sohn.com

Tel: +49-[0]7433-9933-0

Fax: +49 (0)7433-9933-149

Internet: www.kern-sohn.com

Operating manual

Analogue refractometer

KERN ORA 4 RR Analogue nD

(research special

liquids)

Version 1.0

01/2015

ORA_4RR-BA-e-1510 2

KERN ORA

Version 1.0 01/2015

Operating instructions

Analogue refractometer

Contents

Technical data................................................................................................ 3

Description..................................................................................................... 4

General information....................................................................................... 5

3.1

Intended use ............................................................................................................................. 5

3.2

Warranty.................................................................................................................................... 5

Basic safety information............................................................................... 6

4.1

Follow the instructions in the operating manual .................................................................. 6

4.2

Warning ..................................................................................................................................... 6

Supplied items ............................................................................................... 7

Before the first use........................................................................................ 7

Use/measurement.......................................................................................... 7

7.1

Zero point calibration............................................................................................................... 8

7.2

Additional advice...................................................................................................................... 9

7.3

Measuring procedure............................................................................................................... 9

Cleaning and maintenance ......................................................................... 10

Storage ......................................................................................................... 10

Service.......................................................................................................... 10

Disposal........................................................................................................ 10

Additional information................................................................................. 10

Annex.............................................................................................................. 1

3 ORA_4RR-BA-e-1510

1 Technical data

Models

KERN

Measuring

range

and

Scales

Scale gradua-

tions

Accuracy

Dimensions

Product Net weight

ORA 4RR nD: 1.440-

1.520

0.001 nD 137x40x40mm 0.135kg

Example scale on the ORA 4 RR

ORA_4RR-BA-e-1510 4

2 Description

1. Prism cover

2. Prism surface

3. Adjustment screw

4. Eyepiece with rubber eyeshade

5. Diopter adjustment ring

6. Optical tubes with rubber grip

7. Storage box

8. Pipette

9. Refractometer

10. Distilled water / calibration liquid

11. Adjustment tool

12. Cleaning cloth

5 ORA_4RR-BA-e-1510

3 General information

3.1 Intended use

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 im-

proper use.

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

ORA_4RR-BA-e-1510 6

4 Basic safety information

4.1 Follow the instructions in the operating manual

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 imme-

diately.

Thoroughly clean the refractometer after each use.

The refractometer must not be exposed to extreme temperatures, high me-

chanical stresses, strong direct sunlight or high humidity.

This refractometer is not a toy. Keep out of reach of children.

Make sure that you will not be hit by anything else while you are using the re-

fractometer, as this could cause serious eye injuries

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.

7 ORA_4RR-BA-e-1510

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.

Refractometer

Storage box

Pipette

Adjustment tool

Cleaning cloth

Distilled water / calibration liquid

6 Before the first use

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 in-

dex 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.

ORA_4RR-BA-e-1510 8

7.1 Zero point calibration

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.

Now apply a few drops of the calibration liquid [10] onto the prism surface [2].

The calibration liquid for the ORA 4RR is Brix 78.8% with block. Confor-

mity at 1.4875 nD

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 test 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 between them shows the refractive index 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. The bright/dark boundary line should be

at 0% Brix. For refractometers which are not adjusted at 0% Brix using distilled

water and have a special calibration liquid, set the bright/dark boundary line to

the calibration line in the field of view. The room temperature must be +20 °C.

For refractometers without automatic temperature compensation (ATC): Con-

vert 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).

Important!

The ambient/room temperature and the sample temperature influence the refracto-

meter 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.

9 ORA_4RR-BA-e-1510

7.2 Additional advice

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.

7.3

Measuring procedure

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.

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.

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.

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.

Important!

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].

ORA_4RR-BA-e-1510 10

8 Cleaning and maintenance

Clean the refractometer using a soft, lint-free cloth moistened with water, or if neces-

sary 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, re-

sulting in measurement errors.

The refractometer is maintenance-free.

Cleaning should be carried out immediately before and after each use of the refrac-

tometer to maximise its life and optimise measurement results.

9 Storage

Store the refractometer in a dry, non-corrosive environment.

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.

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.

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.

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