26 - 28 September 2017 // Nuremberg, Germany

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Zoom product LOGO_Hot-Wall Retort Furnaces up to 1100 °C

Hot-Wall Retort Furnaces up to 1100 °C

LOGO_Hot-Wall Retort Furnaces up to 1100 °C

Hot-Wall Retort Furnaces up to 1100 °C

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NRA 17/06 - NRA 1000/11
These gas tight retort furnaces are equipped with direct or indirect heating depending on temperature. They are perfectly suited for various heat treatment processes requiring a defined protective or a reaction gas atmosphere. These compact models can also be laid out for heat treatment under vacuum up to 600 °C. The furnace chamber consists of a gas tight retort with water cooling around the door to protect the special sealing. Equipped with the corresponding safety technology, retort furnaces are also suitable for applications under reaction gases, such as hydrogen or, in combination with the IDB package, for inert debinding or for pyrolysis processes.

Different model versions are available depending on the temperature range required for the process:

Models NRA ../06 with Tmax 650 °C

  • „„Heating elements located inside the retort
  • „„Temperature uniformity up to ΔT 6 K inside the work space from 100 °C - 600 °C
  • „„Retort made of 1.4571
  • „„Gas circulation fan in the back of the retort provides for optimal temperature uniformity

Models NRA ../09 with Tmax 950 °C

  • „„Outside heating with heating elements surrounding the retort as well as an additional door heater
  • „„Temperature uniformity up to ΔT 6 K inside the work space from 200 °C - 900 °C
  • „„Retort made of 1.4841
  • „„Fan in the back of the retort provides for optimal temperature uniformity

Models NR ../11 with Tmax 1100 °C

  • „„Outside heating with heating elements surrounding the retort as well as an additional door heater
  • „„Temperature uniformity up to ΔT 10 K inside the work space from 200 °C - 1050 °C
  • „„Retort made of 1.4841

Basic version

  • „„Compact housing in frame design with removable stainless steel sheets
  • „„Controls and gas supply integrated in the furnace housing
  • „„Welded charging supports in the retort or air-baffle box in the furnace with air circulation
  • „„Swivel door hinged on right side with open cooling water system
  • „„Multi-zone control for 950 °C and 1100 °C version, separated by furnace chamber and door. Depending on furnace chamber additionally subdivided into
  • one or several heating zones
  • „„Temperature control as charge control with temperature measurement inside and outside the retort
  • „„Gas supply system for one non-flammable protective or reaction gas with flow meter and solenoid valve, switchable via the control system
  • „„Operation under vacuum up to 600 °C with optional single-stage rotary vane pump
  • „„Port for vacuum pump for cold evacuation
  • „„Applications only allowed within constraints of operating instructions
  • „„PLC controls with touch panel H 700 for data input (resp. P 300 for 650 °C-version)

Additional equipment

  • „„Upgrade for other nonflammable gases
  • „„Automatic gas injection, including MFC flow controller for alternating volume flow, PLC controlled with touch panel H 3700
  • „„Vacuum pump for evacuating of the retort up to 600 °C, attainable vacuum up to 10⁻⁵ mbar subject to selected pump
  • „„Cooling system for shortening process times
  • „„Heat exchanger with closed-loop cooling water circuit for door cooling
  • „„Measuring device for residual oxygen content

H₂ Version for Operation under Hydrogen
When hydrogen is used as a process gas, the furnace is additionally equipped with the required safety technology. Only certified and industry proven safety sensors are used. The furnace is controlled by a fail-safe PLC control system (S7- 300F/safety controller).

  • H₂ supply at controlled overpressure of 50 mbar relative
  • „„Certified safety concept
  • „„PLC controls with graphic touch panel H 3700 for data input
  • „„Redundant gas inlet valves for hydrogen
  • „„Monitored pre-pressures of all process gases
  • „„Bypass for safe flushing of furnace chamber with inert gas
  • „„Torch for thermal afterburning of exhaust gases
  • „„Emergency flood container for purging the furnace in case of failore

Cold-Wall Retort Furnaces up to 2400 °C

LOGO_Kaltwandretortenöfen bis 2400 °C

High-Temperature Chamber Furnaces with Molybdenum Disilicide Heating Elements with Fiber Insulation up to 1800 °C

LOGO_Kammer-Hochtemperaturöfen mit Molybdän-Disilizid-Beheizung mit Faserisolierung bis 1800 °C

Rotary Tube Furnaces for Continuous Processes up to 1300 °C

LOGO_Drehrohröfen für kontinuierliche Prozesse bis 1300 °C

Hot-Wall Retort Furnaces up to 1100 °C is assigned to following product groups:

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