KERN OPTICS ORA 1UA-UB UREA Basic Analogue Refractometer Instruction Manual

: June 16, 2024
: KERN OPTICS

KERN OPTICS ORA 1UA-UB UREA Basic Analogue Refractometer Instruction Manual
$KERN OPTICS ORA 1UA-UB UREA Basic Analogue Refractometer$

Technical data

Models KERN| Measuring range and Scales| Scale graduations Accuracy| Dimensions Product| Net weight
---|---|---|---|---
ORA 1UA/UB| 0-40 % urea| 0,2 %| 160x40x40mm| 0,140kg
oRA 4UA/UB| urea: 30-35% EG: -50°C – 0°C PG: -50°C – 0°C CW: -40°C – 0°C BF: 1,10 – 1,40 kg/l| 0,2 % 1°C 1°C 5°C 0,01 kg/l| 160x40x40mm| 0,140kg

Example scale on ORA 1 UB

Example scale on ORA 4 UB

Description

Prism cover
Prism surface
Adjustment screw
Eyepiece with rubber eyeshade
Diopter adjustment ring
Optical tubes with rubber grip
Storage box
Pipette
Refractory
Calibration liquid (Distilled water)
Adjustment tool
Cleaning cloth

General information

Intended use

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.

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.

Basic safety information

Follow the instructions in the operating manual

Carefully read through the operating manual even if you have prior experience with KERN hectometers.
Every language version includes a non-authoritative translation.
The original German document is the definitive version.

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.
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 refractometer, 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.

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
Calibration liquid (Distilled water)

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.

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.

Zero point calibration

Hold up the refractory against a sufficiently bright light source and look through the eyepiece [5], holding the rubber eye shade [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.
Now apply a few drops of the calibration liquid [10] 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.
Look through the eyepiece [4] while pointing the refractory 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 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 1UA/1UB: 0 % urea Calibration value ORA 4UA/4UB: 0 °C EG / PG / CW
Repeat step 4 (cleaning).

Important!

The ambient/room temperature and the sample temperature influ-ence the refractory measuring result. The scales of the refractory models, which have “UB” 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.
Refractory models, which have “UA” 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.

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.

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]. 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.
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.
The instruments have a marking on the scale at 32.5 % urea. That indicates the target value of the urea concentration in AdBlue®.
The instruments have a marking on the scale at 32.5 % urea. That indicates the target value of the urea concentration in AdBlue®.

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].

Cleaning and maintenance

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.

Storage

Store the refractometer in a dry, non-corrosive environment, preferably between 10 °C and 30 °C.

Service

After reading this operating manual, if you have any questions about setting up or using the refractory, or if any unexpected problem occurs, please contact your dealer. The device housing may only be opened by trained service technicians authorized by KERN.

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.

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.

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Tel: +49-[0]7433-9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com

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