Digital Refractometer RA-620

Digital Refractometer RA-620
Digital Refractometer RA-620

The RA-620 Refractometer is the ideal choice for quick and reliable measurements of liquid samples with a refractive index in the range between 1.32 and 1.70.

This instrument is ideally suited for the quality control  and concentration measurements in the pharmaceutical, chemical, aroma, flavor and fragrance and petrochemical industry. It conforms to the specific requirements, methods (like US, European Japanese and UK Pharmacopoeia), norms (like ASTM 1218) and regulations of these industries.

Maximal efficiency with minimal space requirements:
The RA-620 fits on a standard A4 page.

Premium quality:
High-grade aluminium casing - no plastic.

Optimal ease of use
thanks to a large color touch screen and sophisticated barcode features.

Comfortable handling through ergonomically favorable design
The shallow and therefore easy to clean measuring cell is located in front of the display. The sample cover, when opened, protects the display against splashes.

Quick and highly accurate temperature control
in the range of 5 to 75°C by means of a solid state thermostate developed based on KEM's long lasting expertise in thermal conductivity measurement. Highly accurate measurements only take a few seconds to perform.

Extremely simple user guidance ensures fail safe operation
Visual indication of concentration ranges, easy to follow step-by-step guide for calibrations and the visual representation of the Abbe image to get aware of problematic samples or insufficient cleaning are just a few examples of the features which ensure reliable results.

Ideally suited for concentration measurements
In addition to the already bulit-in scales up to 100 concentration tables can be stored in the instrument.

Hassle-free, operating system independent connection to PC – no special software required.
Whether you are using Windows, OSX or Linux: All you need to control the instrument and to collect the measuring data is your preferred Web browser like Firefox, Google Chrome or Internet Explorer. If you do not want to connect your instrument directly to a PC, measuring data can easily be transferred by means of an USB memory stick. 

Details

Abbe View – higher reliability

Turbid samples cause scattered light. Scattered light affects the precision of the measurement. When working with an optical Abbe refractometer, the operator gets aware of this problem. When using a digital normal digital refractometer, the operator simply gets a wrong result – without getting aware of the problem. With the new RA-600 and RA-620 refractometers, we solved this problem: The Abbe image can be displayed directly – an unique feature of KEM's latest generation of digital refractometers.

Abbe View
Abbe View (1/2): Non critical sample
Abbe View (2/2): Critical sample

Passed / failed indication – the main purpose of QC

Quality control is normally done in order to check whether parameter measured is within the set tolerances. Normal digital refractometers simply display the numeric value of the result. The new RA-600 and RA-620 take a decisive step forward: They directly show, whether the sample was within the set tolerances.

RA-6XX: 	Passed / failed indication
Passed / failed indication (1/2): Passed
Passed / failed indication (2/2): Failed

Ergonomically favorable design

The cover of the measuring cell does not only prevent evaporation of volatile components, it a the same time protects the display against splashes and makes sure, that no measurements are done while the cover is open.

RA-6XX: Handling
Handling (1/3): Add sample
Handling (2/3): Start measurement
Handling (3/3): Clean sample stage

Correct adjustments – operating instructions built in

Our experience shows that incorrect adjustments are the number one source of error when doing refractive index measurements. That's why the RA-600 and RA-620 Refractometers themselves ensure they are properly adjusted by guiding the operator automatically through the entire adjustment process.

RA-6XX: Calibration
Calibration (1/3): Performing calibration with air
Calibration (2/3): Performing calibration with water
Calibration (3/3): End of calibration

Applications

Food and Beverage

  • Honey
  • Starch Syrup
  • Liquid Sugar
  • Isomerized Sugar
  • Glucose
  • Sweeteners
  • Beet Sugar
  • Jam, Marmalade
  • Fat & Oil
  • Cooking oil
  • Cottonseed oil
  • Sesame oil
  • Canola oil
  • Olive oil
  • Palm oil
  • Coconut oil
  • Condiments
  • Ketchup
  • Vinegar
  • Purée
  • Soy sauce
  • Alcoholic drinks
  • Beer
  • Wine
  • Japanese sake
  • Whisky
  • Soft drinks
  • Carbonated drinks
  • Fruit drinks
  • Coffee drinks
  • English tea
  • Milk
  • Soy milk
  • Lactic acid drinks
  • Fruits
  • Oranges
  • Grapes
  • Pears
  • Watermelons
  • Melons
  • Lemons
  • Apples
  • Grapefruit
  • Pineapples
  • Peaches
  • Limes
  • Tomatoes

Standards

ICUMSA: GS4/3-13
SPS-3

 

ISO: 1743

OIML: R124

Petroleum and Chemicals

  • Light oil
  • Kerosene
  • Gasoline
  • Cyclohexane
  • Styrene
  • Benzene
  • Toluene
  • Xylene
  • Quenching oils
  • Cutting oils
  • Lubricants
  • Water sol. lubricants
  • Insulating oils
  • Water sol. hydraulic oils
  • Water sol. metal working oils
  • Rust preventive oils
  • Antifreeze
  • Ethylene glycol
  • Propylen glycol
  • Surfactants
  • Water sol. quenching oils

Standards

ASTM: D 1218
D 1569
D 1807
D 1992
D 2140
D 4056
D 4095

Pharmaceuticals, Flavours & Fragrances, Cosmetics

  • Injection solutions
  • Chinese herbal remedy
  • Eyedrops
  • Shampoos
  • Glycerol
  • Hair conditioners
  • Detergents
  • Skin toner
  • Hair tonic
  • Serum
  • Urine
  • Disinfectants
  • Ethyl alcohol
  • Flavors
  • Fragrances
  • Essential oils

Standards

European Pharamacopeia
American Pharmacopeia
Japanese Pharmacopeia

Technical Specifications

Measuring principle Detection of the angle of total reflection  
Light source LED 589.3 nm (NaD Line)  
Measuring range Refractive Index (nD)
Brix
1.32000 … 1.58000
0.00 … 100.00 %
Limit of error 1)

Refractive Index (nD)
Brix ((0 … 85 %)

±0.00002
±0.014 %
Repeatability 2)

Refractive Index (nD)
Brix (<5 %)
Brix  (≥5 %)

0.0001
0.007 % 
0.01 % 

Resolution

Refractive Index (nD)
Brix (<5 %)
Brix (≥ 5 %)

0.0001
0.001 %
0.01 % 
Temperature control

Peltier Thermostat 5 … 75 °C 3)

 
Temperature indication resolution 0.01 °C  
Minimum amount of sample 0.2 mL  
Display 4.7 inch backlit color LCD  
User interface Touchscreen  
Security Password protection  
Data storage Number of methods
Measurement results
Calibration records
Performance test records
External data storage
 
100
300
20
20
USB Flash Drive 
Temperature compensation Brix (by means of preprogrammed table) 5 … 75 °C
Concentration By user defined tables.  Storage capacity:  100 Tables
Interfaces LAN 1 port for personal computer
USB1.1, 2 ports 

RS-232C 

for USB flash drive, A4 size printer,
barcode reader, keyboard 
Ambient conditions Temperature
Humidity
5 … 35 °C
85% RH max. (no condensation)
Power supply

AC 100...240 V, 50/60 Hz

(comes with AC adapter
Dimensions

192 (W) × 281 (D) × 166 (H) mm

 
Weight 5 kg  
Materials in contact with sample Prism
Sample stage 
artificial sapphire
SUS316 
Options

PC-Software

Barcode scanner

For direct data storage in MS EXCEL

To read sample names, select measuring
conditions and certified values of refractive
index standards 

1) According to KEM's standard conditions.
2) According to KEM's standard conditions. Depends on sample characteristics.
3) Lowest possible measuring temperature = 12 °C below ambient temperature

Automation

Single Sample Automation

DCU-551N Auto Clean and Sampling Unit
DCU-551N Auto Clean and Sampling Unit

DCU-551N Auto Clean and Sampling Unit for 20 ml vials

The DCU-551N does not only save operators a great deal of work, it enhances at the same time safety in the working place and significantly increases the reproducibility and accuracy of measurement especially when non homogeneous, highly viscous, volatile hygroscopic or toxic samples must be measured.

  • Powerful cleaning and drying of the measuring cell and the tubing after each measurement.
  • Sampling by overpressure. Advantages:
    • High availability, low maintenance as the sampling pump is contacted by dry air only.
    • Handles even highly viscous samples with a viscosity of up to 30'000 mPa·s.
    • Automatic sample recovery.

 

DCU-551SS Auto Clean and Sampling Unit for 8 ml vials

The DCU-551SS sample changer allows to measure samples in 9 ml vials. All the other characteristics are the same as the ones of the DCU-551N.

 

A measuring system consisting of an RA-620 Refractometer and a DCU-551N Auto Clean and Sampling Unit is the ideal solution for highly accurate Brix measurements of syrups and moisture content determinations in glycerol.

In the petrochemical industry, the DCU-551 increases the operational and occupational safety, as operators do not get in direct contact with toxic solvents.

 

SpecificationDCU-551NDCU-551SS
Size of vials 20 mL 8 mL
Max. sample viscosity 50'000 mPa·s 50'000 mPa·s
Ambient conditions 5 … 35°C
85% RH max.
(no condensation)
5 … 35°C
85% RH max.
(no condensation) 

Sample Changer

CHD-502N Sample Changer
CHD-502N Sample Changer

CHD-502N Sample Changer with 30 positions

The CHD-502N sample changer does not only save operators a great deal of work, it enhances at the same time safety in the working place and significantly increases the reproducibility and accuracy of measurement especially when non homogeneous, highly viscous, volatile or toxic samples must be measured.

  • Automatic measurement of up to 30 samples in 20 mL vials.
  • Powerful cleaning and drying of the measuring cell and the tubing after each measurement.
  • Sampling by overpressure. Advantages:
    • High availability, low maintenance as the sampling pump is contacted by dry air only.
    • Handles even highly viscous samples with a viscosity of up to 30'000 mPa·s.
    • Automatic sample recovery.
  • Emergency sample function. A running series can easily be interrupted to measure an urgent sample.

 

CHD-502SS Sample Changer with 48 Positions

The CHD-502SS sample changer allows to measure up to 48 samples in 9 ml vials. All the other characteristics are the same as the ones of the CHD-502N.

 

SpecificationCHD-502NCHD-502SS
Number of sample vials 30 48
Size of vials 20 mL 8 mL
Max. sample viscosity
(at meas. temperature)
50'000 mPa·s 50'000 mPa·s
Ambient conditions 5 … 35°C
85% RH max.
(no condensation)
5 … 35°C
85% RH max.
(no condensation)

Software

Soft Cap Data Capture Software

SOFT CAP Data Capture Software
SOFT CAP Data Capture Software

The easy way to transfer your results directly to Microsoft EXCEL

The Data Capture Software is an easy to use and flexible solution to collect measurement results from different KEM instruments (Refractometers, Density Meters, Potentiometric or Karl-Fischer Titrators, Thermal Conductivity Meters) on a Windows personal computer.

  • Up to four different instruments can be connected to one single PC and be used simultaneously. Two of these instruments can be of the same model.
  • The results can directly be stored in EXCEL workbooks. The measured results are always available at a glance in a clear and concise manner.
    • As soon as a measurement has finished, the result appears in the corresponding worksheet.
    • The layout, order and the format how the results are stored in EXCEL can freely be adapted to specific needs.
    • Results can be automatically be processed by EXCEL macros as they are transmitted to the PC. Additional data (comments, sample data, etc.) can be entered at any time by means of the PC keyboard or a barcode reader.
  • All results can at the same time be stored in as CSV files.

System Requirements for PC

SpecificationDescription
Computer Personal computer with Pentium II CPU of 233MHz or better
Operating system Microsoft Windows 2000, XP,
Vista (Home Basic, Business), 7 (Home Premium, Professional)
Other programs Microsoft EXCEL 97 / 2000 / 2003 / 2007
RAM at least 128 MB / 512 MB recommended
Hard disc space 10 MB required for installation
Display Resolution higher than 640 * 480
Disk drive CD-ROM or DVD-ROM
Interface 1 USB port
RS-232C D-sub (male) 9 pin required for each additional instrument
to be connected to the same computer.

Accessories

Printers

IDP-100 Printer
IDP-100 Printer

IDP-100 Printer

Dot matrix ink printer for GLP compliance.

  • Dot matrix printer with ink ribbon, prints on regular paper (width 57.5 ± 0.5mm).
  • 24 digits, 144 dots per line.
  • Automatic paper end detection - no loss of data!
  • 2 kB internal buffer memory. Advantage: Less time required per measurement, as the instrument does not have to wait until the results are printed out.
DP-600 Thermal Printer
DP-600 Thermal Printer

DP-600 Thermal Printer

Thermal printer.

  • High printing speed.
  • Silent operation.

Certified Standard Reference Material

Refractive index determination with laser interferometer
Refractive index determination with laser interferometer

Liquid Refractive Index and Brix Standards

 

jcsslogo.png

 

KEM does not only supply refractometers, it has was well a JCSS (Japan Calibration Service System) Accredited Calibration Laboratory (assessed on JIS Q 17025:2000 (ISO/IEC 17025:1999) where a wide range of certified refractive index standard reference material is produced. KEM has the JCSS accreditation number 0115. The refractive index of these standards is determined with a laser interferometer. All standards come with a certificate bearing the JCSS symbol which assures their traceability to National Measurement Standards of Japan which are recognized worldwide through the ILAC and APLAC MRA.

 

Certified Refractive Index Standard Reference Material
Certified Refractive Index Standard Reference Material

The refractive index standard reference material is always supplied as a set of two 10 mL vials: 1 vial of standard reference material water and one vial of standard reference material with a different refractive index (organic solvent). The refractive index standard reference material has a shelf life of 12 months.  The certified Brix standard reference material is supplied in sets of two 10 mL vials. This type of standard reference material has a shelf life of 1 month only.

 

StandardRefractive Index (nD at 20°C)Limit of error (nD)Ordering number
Water / 2 bottles 1.33299 ±0.00003  12-01610-02
Iso-Octane/Water/ea. 1 bottle 1.391.. ±0.00003  12-04077-02
Dichlorotoluene /Water/ea. 1 bottle 1) 1.546.. ±0.00003 12-04080-02
Dibenzyl ether/Water/ea. 1 bottle 1) 1.563.. ±0.00003 12-04081-02
1-Bromonapthalene/Water/ea. 1 bottle 1) 2) 1.658.. ±0.00003 12-04082-02

1) Not suitable for the RA-130 Refractometer
2) Not suitable for the RA-600 Refractometer 

 

StandardBrix% | nDLimit of error (nD)Ordering number
5% Brix solution / 2 bottles 5% Brix | 1.340.. nD ±0.013% Brix | ±0.00002 nD 12-04083-10
10% Brix solution / 2 bottles 10% Brix | 1.347.. nD ±0.013% Brix | ±0.00002 nD 12-04083-11
20% Brix solution / 2 bottles 20% Brix | 1.363.. nD ±0.013% Brix | ±0.00002 nD 12-04083-12
30% Brix solution / 2 bottles 30% Brix | 1.381.. nD ±0.013% Brix | ±0.00002 nD 12-04083-13
40% Brix solution / 2 bottles 40% Brix | 1.399.. nD ±0.013% Brix | ±0.00002 nD 12-04083-14
50% Brix solution / 2 bottles 50% Brix | 1.420.. nD ±0.013% Brix | ±0.00002 nD 12-04083-15
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