The drum roasting process in detail

The heart of PROBAT’s R Series drum roaster is a horizontal roasting drum, directly driven by a gearmotor.  Paddles in the drum circulate the coffee beans during the roasting process. The flame of a burner generates the energy for the roasting air which is guided both through as well as around the roasting drum by means of flaps. As such, heat is applied mainly through convection via the hot incoming air as well as through conduction via the bean’s contact with the roasting drum.


Best Life-Cycle Costs and Performance


The PROBAT R Series roasters are all equipped with a user-friendly control panel for precise, consistent results.

  • fully automated PC-based control system
  • clear visualization and simple operation
  • recipe management with up to 999 user-definable recipes. Settings that have been saved are reproduced safely and automatically.
  • Reflex Automatic function (optional): reproducibility of roasting profiles by eliminating external influences such as varying batch sizes, green-coffee moisture or ambient temperature
  • overview of all key roasting parameters and temperature curves
  • all data relevant to production is saved, allowing it to be accessed and analyzed at any time
  • transparent presentation of the system’s operating status in real time
  • can be operated directly at the roaster or centrally from a control room
Environment and Cost-Effectiveness

Thermal or catalytic afterburners as well as flameless regenerative afterburners for the treatment of roasting and cooling exhaust streams.

  • energy savings through recirculation of roasting exhaust air
  • energy savings and increased production through green-coffee preheating
  • reduction of product-specific odors and visible roasting exhaust
  • pollution control methods can be adapted to meet the most stringent regulations
  • maximum cleaning efficiency thanks to the Proforte exhaust air treatment system (flameless, renewable, thermal oxidation).
  • energy monitoring for cost transparency
  • minimal heat loss due to particularly well-insulated roasting system
  • thermal cleaning cuts human resource costs and saves time

PROBAT safety technology goes far beyond standardized requirements. We offer safety components that guarantee maximum process security.

  • ensuring the functional safety of your processing systems
  • flexibility thanks to a multi-step safety system and the use of safety PLCs
  • maintenance-friendly safety components
  • thermal cleaning minimizes deposits
  • online CO monitoring guarantees maximum safety within the roasting system
  • monitoring of key air temperature with redundant thermocouple systems
  • safe operation with extremely dark roasts and/or low-quality green coffee
  • battery and water buffer increase operation safety