Abbe 60 Refractometers

Abbe 60 Direct Reading Refractometers

More stringent requirements of quality control and, in some cases, changing legislation, mean that greater accuracy is being demanded of refractometers. The Abbe 60 Direct Reading models, available in two measuring ranges, have been designed to meet these requirements.

The latest designs incorporate an externally mounted LED light source for sample illumination.

A wavelength compensation device is used to 'achromatise' to the mean sodium wavelength (589.3nm). Refractive Index can be read directly from a scale divided to 0.001 allowing for estimation to ±0.0001. Temperature control can be achieved by circulation of water; prism temperature is displayed in digital form.

Direct reading models are particularly suitable for the measurement of sugar solutions and sugar content of food and drink products. They can also be used to determine the refractive index of pure liquids, solutions and formulated products including: flavourings, fragrances, oils and fats, solvents, plastics, resins, adhesives and many other industrial chemicals.

Instruments come complete with external power supply, standardisation plate and contact liquid, plastic dust cover and instructions for use.

High Accuracy Range of Abbe 60 Refractometers

The high accuracy models are designed for use with monochromatic light sources such as the sodium and spectral source range available from Bellingham+Stanley. A computer program (Windows-based) for conversion of scale readings to refractive index (RI) or Brix (Sugar %) is supplied with each instrument. With good temperature control and use of the micrometer Vernier Scale, an average accuracy of ±0.00004 RI can be achieved across the specified measuring range. Temperature can be controlled by use of a water bath and circulator; prism temperature can be read from the digital display on the instrument.

The high accuracy Abbe instruments offer a dispersion measurement capability: 400 - 700 nm.

The high accuracy Abbe 60 refractometers offer sample illumination by way of reflected light, allowing easier measurement of non-homogenous and opaque samples that are difficult to read under the conventional ‘transmitted’ illumination.

High Accuracy Abbe 60 Refractometers are ideal for use in research and development, quality control and other industrial laboratories where the highest accuracy and precision is often sought. The Abbe 60/ED conforms to the requirements of ASTM D1218 and is used widely throughout the petroleum industry. The Abbe 60/LR offers low range RI measurement of anaesthetics and the such like.

The instruments come complete with digital thermometer, traceable standardisation plate and contact liquid, power supply, sodium D line calibration tables, plastic cover and instructions for use.

Accessories and spares for the high accuracy models are listed below.

Technical Specifications for Abbe 60 Direct Reading Refractometers

Scale and scale division Order code Model Sugar % (Brix)* Refactive index 10-99 60/DR 0-95 x 0.5 1.30-1.74 x 0.001 10-03 60/95 0-5 x 0.2 50-95 x 0.1 1.30-1.535 x 0.001 The working temperature range for these instruments is from +5 to 75°C *Sugar scale is based on % w/w sucrose in water or Brix (ICUMSA 1974)

Technical Specifications for Abbe 60 High Accuracy Range Refractometers

Order code Model Refractive Index Range 10-04 60/ED 1.30-1.74 (589 nm) 10-06 60/LR 1.20-1.70 (589 nm) The working temperature range for these instruments is from +5 to 75°C

Spares and Accessories

Order code Description 10-41 Stainless steel funnel flow cell for repetetive sampling 10-42 Volatile liquid cell 10-58 Divided cell for differential measurements 10-43 Contact liquid (monobromonaphthalene) for test plates and solid samples with RI up to 1.65. Quantity 6 ml 10-61 Contact liquid (methylene iodide) for test plates and solid samples with RI up to 1.74. Quantity 3 ml 10-62 Contact liquid (SMI) for solid samples with RI up to 1.79. Quantity 10 ml 10-69 Abbe filter eyecap for use with spectral sources using appropriate interference filter. Manufactured to order 10-44 Glass test plate with RI approximately 1.5222 10-46 Silica test plate RI 1.45839 (traceable). Certificate available at extra cost 10-49 Polarising eyepiece for bi-refringent samples 10-59 Glass substrate for resin samples (use with 10-43) 59-01 Free standing sodium lamp outfit 190/250v AC, 50/60 Hz 59-06 Free standing sodium lamp outfit 100/130v AC, 50/60 Hz 59-50 Spare sodium bulb 10-660 Abbe utilities software For sample illumination at wavelengths other than sodium (589nm), please download Spectral Sources literature (PDF).

These products comply with the requirements of the Low Voltage
Directive 73/23/EEC and the EMC Directive 89/336/EEC

Bellingham & Stanley Ltd pursue a policy of continuous product development and improvement, and as such, information given on this Data Sheet may be updated or withdrawn without notice.