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[January 2004]
New Conductive Asphalt Peltier
Bohlin Instruments, acquired in the last quarter of 2003 by Malvern Instruments Ltd (Malvern, Worcs, England), is now offering a Peltier-based technology for asphalt testing applications where a 'dry' system of temperature control is the preferred option. This new design, claims the company, gives the best possible compromise between the inherent characteristics of a 'dry' system and the particularly demanding characteristics of asphalt binders.
The Peltier unit can be used with Bohlin's CVO-ADS, CVOR or Gemini rheometers. It is interchangeable with other controllers, including a conventional DSR water jacket system, using Bohlin's Easy-Swap technology.
The design uses a heated upper oven enclosure to provide a thermally stable sample environment and includes a conductively heated lower plate. This is said to be a major distinguishing feature between Bohlin's design and other commercially available alternatives - it reduces sample lag, which is the main disadvantage of dry systems and a major problem with radiative (rather than conductive) designs.
A further advantage of the Bohlin design is that the unit requires no readjustment between routine maintenance visits since its inherent characteristics ensure calibration stability.
www.bohlin.com
ENDS