Conductive asphalt peltier

Where a ‘dry’ system of temperature control is the preferred option, Malvern Instruments offers a Peltier based technology offering the best possible compromise between the inherent characteristics of a ‘dry’ system and the particularly demanding characteristics of asphalt binders.

The unit can be used with the Bohlin CVO-ADS, CVOR or Gemini rheometers and is interchangeable with other controllers, including a conventional DSR water jacket system, using 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 a major distinction 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. Another advantage of the Malvern design is that because of its inherent characteristics, the calibration of the unit is stable and does not require re-adjustment between routine maintenance visits.

Key features and benefits

Conductive heating technology

• Gives improved sample response
• Minimises radial temperature gradients
• Minimises temperature offset

Heated, 2 part, upper oven enclosure

• Improves access for trimming
• Minimises vertical temperature gradients
• Eliminates radiative thermal losses
• Provision for Cannon probe

Single heater element design

• Hi mass lower plate reduces temperature gradients
• Eliminates recalibration of temperature
• Improves accuracy of temperature control

Integral DIN standard temperature sensor in lower measurement plate

• Accurately measures sample temperature

PEEKTM upper measurement shafts

• Eliminates conductive thermal losses
  Ultra lightweight low inertia – minimal associated errors

Lower measurement plates are easily removable

• Allows rapid interchange between 25mm and 8mm lower pedestals
  Enables remote cleaning of the plate
  Enables remote sample loading on the plate

Performance Specifications

• Range : -10ºC to 100ºC
• Stability: +/- 0.1ºC
• Accuracy: +/- 0.1ºC