The classic

A drum roaster which rotates on a horizontal axis is the most conventional method of roasting coffee as well as the traditional form of slow roasting coffee. The PROBAT drum roaster system NEPTUNE is the culmination of the development of traditional slow-roasted coffee. Exquisite slow-roasts can be guaranteed with capacities of 480, 1,500 and 3,000 kilogram/hour (kg/h). The NEPTUNE roaster’s different designs and extensive variety of configurations allow it to meet the most diverse range of customer requirements.

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benefits to your coffee

Additional Information

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Environment and Cost-Effectiveness

Different PROBAT systems make it possible to clean and reuse the thermal energy released during the roasting process. They are specifically tailored to the respective roasting process.

  • 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
  • Reduction of emissions and adherence to local thresholds through modular exhaust air treatment systems
  • Maximum cleaning efficiency thanks to the Proforte exhaust air treatment system (flameless, renewable, thermal oxidation).
  • Energy monitoring for cost transparency
  • Heat recovery through the use of heat exchangers
  • Minimal heat loss due to particularly well-insulated roasting system
  • Thermal cleaning cuts human resource costs and saves time

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

  • Ensuring the functional safety of your processing systems
  • Flexibility thanks to a multistep safety system and the use of safety PLCs
  • Maintenance-friendly safety components
  • Thermal cleaning minimises deposits
  • Online CO monitoring guarantees maximum safety within the roasting system
  • Monitoring of cooling exhaust air temperature via thermocouple
  • Safe operation with extremely dark roasts and low-quality green coffee
  • Battery and water buffer increase operation safety


the drum roasting process

The heart of PROBAT’s NEPTUNE drum roasters is a horizontally lying roasting drum which is  equipped with a rotary drive. Shovel blades 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 through conduction via the bean’s contact with the roasting drum as well as through convection via the hot incoming air. The addition of water systematically ends the roasting process while simultaneously precooling the roasted coffee.

To find out whether the Probat Neptune would be right for you contact us.