The Abbe Refractometer derives its name from the 19th Century physicist Ernst Abbe (1840-1905). Abbe designed an instrument for measuring the dispersion of light and this became the precursor for the so-called ‘Abbe Refractometer’.
Bellingham + Stanley offer a number of Abbe refractometers and a choice can be made in accordance with the measurement requirement and budget availability.
The Abbe 5 offers direct refractive index and Brix readings at a low price and is ideal for academia as well as for general measurement within industry.
Abbe 60 refractometers are manufactured to extremely high standards and come in a variety of scale ranges to suit particular application requirements.
The Abbe 60/95 offers high-resolution readings within the Brix scale (better than ±0.2 Brix) and is used for the measurement of viscous corn syrups and sugars, whilst the Abbe 60/DR offers high refractive index measurement to 1.74 to 4-decimal places.
High accuracy, multiple wavelength versions (Abbe 60/LR and Abbe 60/ED) cover a refractive index range from 1.20 to 1.74 RI and require the use of ‘spectral lamp outfits’. As such, the instruments may also be used for measurements of dispersion over the visible spectrum and can provide results to five decimal places – the highest accuracy available with this type of instrumentation. The Abbe 60ED conforms to test measurement ASTM 1218.
The E-Line Gemological refractometer is a low cost, lightweight measuring instrument used exclusively by jewellers and traders of gemstones.
All Abbe refractometers are particularly suited to the measurement of solids and semi-solids such as thin film polymers, rubber, glass and fibre optics as well as liquid samples.
All instruments* feature a temperature control facility by way of waterbath connection and temperature measurement is made by integral sensor and displayed digitally (LCD).
‘Freeware’ for converting results to other scales and for calculating dispersion is available from this site.