Certain heat treatment processes require a gas-fired chamber furnace. Short heating times due to the high power are a convincing argument. The chamber furnaces with powerful atmospheric gas burners cover a wide variety of these processes. In the basic version the burners are manually ignited once at the start of the process. The automatic control system then takes over control of the temperature curve. At program end, the burners are automatically switched off. Depending on the process, the furnaces can be equipped with automatically controlled fan burners and safety technology for debinding. Depending on the model, these furnaces can be upgraded with fully automatic fan burners and additional accessories.

• Tmax 1300  °C
• Powerful, atmospheric burners for operation with liquified gas or natural gas
• Depending on the application, special positioning of the gas burners with flame guidance provides for optimal temperature uniformity
• Fully automatic temperature control
• Gas fittings with flame control and safety valve in accordance with DVGW (German Technical and Scientific Association for Gas and Water)
• Multi-layer, reduction-proof insulation with light-weight refractory bricks and special back-up insulation result in low gas consumption
• Self-supporting and rugged ceiling, bricks laid in arched construction or as fiber insulation
• Exhaust hood
• Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
• Defined application within the constraints of the operating instructions

Additional equipment

• Fan burner with fully automatic control
• Indirect gas firing with radiation tubes for flame protection of the charge
• Exhaust air and exhaust gas piping
• Thermal or catalytic exhaust cleaning systems
• Recuperator technology for heat recovery
• Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control

These universal chamber furnaces with radiation heating have been specifically designed to withstand heavy-duty use in the heat treatment shop. They are particularly useful for processes such as tool making or for hardening jobs, e.g. annealing, hardening and forging. With help of various accessories, these furnaces can be customized to your application requirements.

• Compact, robust design
• Three-sides heating: from both side walls and bottom
• Heating elements on support tubes ensure free heat radiation and a long service life
• Bottom heating protected by heat conducting SiC tiles
• Stainless steel upper door jamb protects furnace structure when furnace is opened hot
• Base frame included in the delivery, N 7/H - N 17/HR designed as table-top model
• Exhaust opening in the side of the furnace, or on rear wall of chamber furnace in the N 31/H models and higher
• Temperature uniformity up to +/- 10 °C according to DIN 17052-1
• Low energy consumption due to multi-layer insulation
• Gas spring dampers provide for easy door opening and closing
• Heat resistant zinc paint for protection of door and door frame (for model N81 and larger)
• Defined application within the constraints of the operating instructions
• NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

These very rugged chamber furnaces with radiation heating are designed for continuous heat-treatment processes. They are ideally suited for forming processes such as forging or hot forming steel sheets. The use of a wide variety of accessories enables these furnaces to be tailored to the relevant application.

• Tmax 1200  °C
• Very rugged design
• Heating from three sides (both sides and the bottom)
• Heating elements installed on ceramic support tubes enable unimpaired heat radiation
• Bottom heating protected by heat-conducting SiC plate
• Manual lift door for chamber furnaces to N 951
• Electro-hydraulic lift door for chamber furnaces from N 1296
• Heating operated with low-wear semi-conductor relay (for models to 60 kW)
• Temperature uniformity up to +/- 10 °C according to DIN 17052-1
• Closable measuring port for customer's temperature measuring system
• Holding time measurement for the charge until it goes to forging or forming of steel sheets: After charging, the operator presses a key and the previously defined holding time for the load begins to run. The end of the holding time is indicated by both acoustic and optical signals, meaning that the charge can be removed.
• Heat resistant zinc paint for protection of door and door frame
• Defined application within the constraints of the operating instructions
• NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

• Other temperatures on request
• SiC plates to protect the wall heating elements
• Electro-hydraulic lift door for models to N 951
• Protective gas ports in combination with silicone sealing of the chamber
• Annealing boxes for powder nitriding, annealing and hardening under non-flammable protective or reaction gases
• Loading devices and charging aids
• Charging grates for heavy loads
• Cooling fan in combination with motor-driven exhaust air flaps in the top of the furnace
• Heating elements also in door and rear wall for optimized temperature uniformity up to +/- 5 °C according to DIN 17052-1
• Commissioning of the furnace with test firing and temperature uniformity measurement using 11 thermocouples including record of the measurement results
• Furnace chamber with optional heating elements in the ceiling when used for preheating of sheetmetal plates
• Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control

The chamber furnaces in the model series NB .. CL are used for heat cleaning of components. An optimum temperature uniformity is not a priority for these processes. Examples are heat cleaning of electric motors, coated surfaces of steel components or the nozzles of plastic injection molding machines. The furnaces are gas-fired and have an integrated thermal afterburner system which is also gas-fired. The pre-set, low-oxygen respectively reducing atmosphere in the chamber furnace effectively prevents spontaneous combustion at the workpiece and subsequent damage as a result of over-temperature. For safe operation, the furnace door locks after program start and cannot be opened again until the temperature has dropped below 180 °C at the process end. In case of a burner flame malfunction or gas shortage the process is aborted. In addition, the control system is equipped with an over-temperature limiter with manual reset that is set by the customer at a safe cut-off temperature to switch off the chamber furnace if the limit is exceeded. The chamber furnaces are not suitable for components and coatings that contain solvents or a high concentration of water. These models must also not be used for charges with low flash points such as wood, paper or wax.

• Tmax 500 °C
• Furnace housing with equipped for safe transport with forklift
• Furnace chamber size dimensioned to hold standard lattice boxes
• Furnace chamber insulation made of non-classified fiber material, bottom and rear wall insulated with lightweight refractory bricks
• High performance, atmospheric burner fueled by liquified gas or natural gas
• Completely automated temperature controls
• Integrated thermal afterburner for exhaust gas cleaning
• Defined application within the constraints of the operating instructions

The chamber furnaces of the model series N .. BO are used for processes with large amounts of organic matters or high vaporization rates. Processes in which the product or contaminations on the product are ashed by ignition can be also carried out safely in this type of chamber furnace. Examples include residual wax removal of pouring clustersfollowed by sintering, or thermal cleaning of oxide catalytic honey combs from soot or fuel residues. The chamber furnaces are electrically heated or gas-fired. The electrically heated furnaces, for safety reasons, are equipped with an integrated gas torch for igniting the flammable components in the gas mixture. The accumulation of flammable components is avoided and their safe combustion is ensured.

The furnace series is suitable for products that will not be damaged by a temporary, uncontrolled temperature rise.

The burning of unwanted organic ingrediants can take place at temperatures > 500 °C. Following this, a subsequent process can take place up to max. 1000 °C or 1400 °C (electrically) or 1000 °C (gas-fired).

For safety, the furnace door locks after the program was started and cannot be opened again until the temperature has dropped below a defined value. In case of burner malfunction or gas shortage the process is aborted.

Chamber furnaces N 100 BO - N 650/14 BO, electrically heated and gas-fired ignition flame

• Tmax 1000 °C or 1400 °C
• Standard sizes up to 650 liters furnace chamber, additional sizes on request
• Exhaust hood
• Fully automatic temperature control
• Optional thermal afterburning
• Ignition flame using natural gas or liquid gas (LPG)
• Defined application within the constraints of the operating instructions

Chamber furnaces models NB 300 BO and NB 650 BO, gas-fired

• Tmax 1000 °C
• Standard sizes up to 650 liters furnace chamber, additional sizes on request
• Integrated thermal afterburning
• Gas burners operating with natural gas or liquid gas (LPG)
• Defined application within the constraints of the operating instructions