The very good temperature uniformity of these chamber furnaces with air circulation provides for ideal process conditiones for annealing, curing, solution annealing, artificial ageing, preheating, or soft annealing and brazing. The furnaces are equipped with a suitable annealing box for soft annealing of copper or tempering of titanium, and also for annealing of steel under non-flammable protective or reaction gases. The modular furnace design allows for adaptation to specific process requirements with appropriate accessories.

• Tmax 450  °C, 650  °C, or 850  °C
• Heating from bottom, sides and top
• Stainless steel air-baffle box in the furnace for optimum air circulation
• Swing door hinged on the right side
• Base frame included in the delivery, N 15/65 HA designed as table-top model
• Horizontal air circulation
• Temperature uniformity up to ∆T 8 K according to DIN 17052-1 (model N 15/65 HA up to ∆T 14 K)
• Optimum air distribution enabled by high flow speeds
• One removable tray and rails for two additional trays included in the scope of delivery (N 15/65 HA without removable tray)

Additional equipment (not for model N 15/65HA)

• Optimization of the temperature uniformity up to ∆T 6 K according to DIN 17052-1
• Fan cooling to accelerate the cooling process
• Motorized exhaust air flaps
• Manual lift door
• Pneumatic lift door
• Adjustable air circulation for sensitive components
• Additional removable trays
• Roller conveyor in furnace chamber for heavy charges
• Annealing boxes
• Feed and charging aids
• Designed for Tmax 950  °C
• Process control and documentation with Controltherm MV software package

These air circulation chamber furnaces are available for maximum operating temperatures of 260 °C, 450 °C, 600 °C or 850 °C and are perfectly suited for demanding processes. Due to their robust and solid design even heavy loads can be heat treated. These furnaces are suited for use with baskets, pallets, and mobile furnace racks. The charging can be carried out with fork lift, pallet truck, or charging trolley. The basic furnace is standing on the shop floor without floor insulation. Charging can be simplified by roller conveyors, if necessary also motorized. All furnaces are available with electric or gas heating.

Standard version for models up to 600 °C

• Tmax 260  °C, 450  °C or 600  °C
• Electrically heated or gas-fired
• Electric heating by means of heater coils
• Direct gas heating or upon request with indirect gas heating with radiation tube, e.g. for heat treatment of aluminum
• Optimal air circulation for your charge by means of adjustable air outlets
• Horizontal air flow (type ../HA)
• High air exchange for perfect heat transfer
• Ground level charging without floor insulation for 260  °C models
• Temperature uniformity up to ∆T 10 K according to DIN 17052-1
• Furnace chamber lined with alloy 1.4301 (DIN)
• High quality mineral wool insulation provides for low outer temperatures
• Inside unlocking device for furnaces with walk-in chambers
• Furnace sizes suitable for common charging systems, such as pallets, baskets, etc.
• Double-wing door for furnaces with an internal width of more than 1500 mm (260 °C and 450 °C models). Furnaces for higher temperatures and with smaller sizes are equipped with a single-wing door.
• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equippment for models up to 600 °C

• Optional floor insulation provides for improved temperature uniformity for 260  °C models
• Entry ramps or track cutouts for floor-level charging cart of models with bottom insulation (not for 600 °C models)
• Furnace positioned on base frame provides for ergonomic charging height
• Electro-hydraulic lift door
• Fan system for faster cooling with manual or motor-driven control
• Motor-driven control of air inlet and exhaust air flaps for better ventilation of the furnace chamber
• Observation window and/or furnace chamber lighting (not for 600 °C models)
• Optimization of the temperature uniformity up to +/- 3 °C according to DIN 17052-1
• Safety technology according to EN 1539 for charges containing solvents (not for 600 °C models)
• Charging systems or roller conveyors, also electrically driven provide for easy charging
• Catalytic or thermal exhaust gas cleaning systems
• Process control and documentation with Controltherm MV software package

Standard version for models 850 °C

• Tmax 850  °C
• Electrically heated or gas-fired
• Electric heating with heating elements on supports tubes
• Direct gas heating into the outlet of the air circulation fan
• Optimal air circulation for your charge by means of adjustable air outlets
• Horizontal air-flow (type ../HA)
• High air exchange provides for perfect heat transfer
• Base frame with 900 mm charging height
• Temperature uniformity up to ∆T 10 K according to DIN 17052-1
• Air baffles made of 1.4828 (DIN)
• Multi-layer insulation with fiber plates (not classified according to EU directive 67/548) provides for low outer temperatures
• Furnaces sizes perfectly suited to accommodate common charging systems, e.g. like pallets or pallet boxes
• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equipment for models 850 °C

• Electro-hydraulic lift door
• Fan system for faster cooling with manual or motor-driven control
• Motor-driven air inlet and control of exhaust air flaps for better ventilation of the furnace chamber
• Optimization of the temperature uniformity up to +/- 3 °C according to DIN 17052-1
• Base frame for customized charging height
• Charging systems or roller conveyors, also electrically driven provide for easy charging
• Designed for Tmax 950  °C
• Process control and documentation with Controltherm MV software package

The chamber dryers of the KTR range can be used for complex drying processes and heat treatment of charges of normal weight and packing density to an application temperature of 260 °C. The high-performance air circulation enables optimum temperature uniformity throughout the usable space. A wide range of accessories allow the furnace to be modified to meet specific process requirements. The design for the heat treatment of combustible materials in conformance with EN 1539 is available for all sizes.

• Tmax 260  °C
• Electrically heated (via a heating register with integrated chrome steel heating elements) or gas-fired (direct gas heating including injection of the hot air into the intake duct)
• Temperature uniformity up to ∆T 6 K according to DIN 17052-1 (for design wihout track cutouts)
• High-quality mineral wool insulation provides for outer temperatures of < 20  °C above room temperature
• High air exchange for fast drying processes
• Double-wing door for furnaces KTR 3100 and larger
• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the dryer and load
• Incl. floor insulation

Additional equipment

• Entry ramp for pallet trucks or track cutouts for charging cart
• Optimal air circulation for individual charges by means of adjustable air outlets
• Fan system for faster cooling with manual or motor-driven control
• Programmed opening and closing of exhaust air flaps
• Observation window and furnace chamber lighting
• Safety technology according to EN 1539 for charges containing solvents
• Charging cart with or without rack system
• Design for clean room heat treatment processes
• Process control and documentation with Controltherm MV software package

With their maximum working temperature of up to 300 °C and forced air circulation, the ovens achieve a perfect temperature uniformity which is much better than in ovens of most competitors. They can be used for various applications such as e.g. drying, sterilizing or warm storing. Ample warehousing of standard models provides for short delivery times.

• Tmax 300  °C
• Working range: + 5 °C above room temperature up to 300  °C
• Models TR 60 - TR 240 designed as tabletop models
• Models TR 450 and TR 1050 designed as floor standing models
• Horizontal, forced air circulation results in temperature uniformity better than ∆T 8 K
• Stainless steel chamber, alloy 304 (AISI)/(DIN material no. 1.4301), rust-resistant and easy to clean
• Large handle to open and close the door
• Charging in multiple layers possible using removeable grids (number of removeable grids included, see table to the right)
• Large, wide-opening swing door, hinged on the right with quick release for models TR 60 - TR 450
• Double swing door with quick release for TR 1050
• TR 1050 equipped transport rollers
• Infinitely adjustable exhaust at the rear wall with operation from the front
• PID microprocessor control with self-diagnosis system
• Solid state relays provide for low­noise operation

Additional equipment

• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
• Infinitely adjustable fan speed of the air circulation fan
• Window for charge observing
• Further removeable grids with rails
• Side inlet
• Stainless steel collecting pan to protect the furnace chamber
• Safety Technology according to EN 1539 for charges containing liquid solvents (TRS) up to model TRS 240, achievable temperature uniformity ∆T 16 K
• Transport costors for model TR 450
• Various modifications available for individual needs
• Upgrading available to meet the quality requirements of AMS 2750 E or FDA
• Process control and documentation with Controltherm MV software package

Certain processes release and vaporize solvents or other flammable vapors. The concentration of these vapors must be kept below a certain limit to prevent ignition. European Norm EN 1539 and NFPA 86 in the USA prescribe the required safety equipment for these processes.

For these applications and processes, all air circulation furnaces of the KTR and air circulation chamber furnaces < 450 °C product lines are suited with safety technology for protection of a potentional ignition in the furnace chamber.

To avoid an ignition in the furnace, flammable vapors must be diluted with air. Special care must be taken so high concentrations of flammable materials do not accumulate in “dead” areas within the furnace. For this purpose, the furnaces are equipped with an exhaust gas fan providing for a defined underpressure. A measurement system monitors this flow, while fresh air is simultaneously resupplied. In parallel, the furnace atmosphere is diluted by the inflow of fresh air. The air circulation is also monitored by the measurement system.

• Furnace sizes between 120 and 10,000 liters
• Powerful exhaust fan capable of maintaining underpressure in the furnace
• Defined and monitored air circulation flow and exhaust air
• Visual and audible emergency signals
• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Clean room applications impose particularly high requirements to the design of the chosen furnace. If the complete furnace is operated in a clean room an essential contamination of the clean room atmosphere must be avoided. Especially, the particle contamination must be reduced to a minimum.

The specific application determines the choice of the required oven or furnace type. In many cases air circulation furnaces are required to achieve the necessary temperature uniformity at lower temperatures. For higher temperatures, Nabertherm has also delivered many furnaces with radiant heating.

If the complete furnace is supposed to be positioned in the clean room, then it is important that both the furnace chamber and the furnace housing as well as the controls provide for good protection against contamination. Surfaces must be easy to clean. The furnace chamber is tightly sealed to the insulation behind it. If necessary, additional equipment such as filters for the fresh air supply or the air circulation in the furnace can be used to improve the cleanliness class. It is recommended to install the switchgear and the furnace controls outside the clean room.

An easy installation alternative to improve cleanness is placing the furnace in the grey room with charging from the clean room. This significantly reduces the amount of costly space needed in the clean room to a minimum. The front and the furnace interior in the clean room are designed for easy cleaning. With this configuration even the highest clean room classes can be achieved.

Logistics between clean room and grey room can often be easily sorted out. Lock furnaces with one door in the grey room and the other door in the clean room are the perfect choice for these applications. The inner chamber as well as the furnace front in the clean room will be especially designed for lowest particle contamination.

Please contact us if you are looking for a heat treatment solution under clean room conditions. We would be pleased to quote for the oven or furnace model that meets best your requirements.

The chamber furnaces in the model series NBCL 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 atmosphere in the furnace effectively prevents spontaneous combustion at the workpiece and subsequent damage as a result of over-temperature. The generated exhaust gases are guided from the furnace chamber into the thermal afterburner where they are incinerated. Depending on the type of exhaust gas involved complete incineration is possible. 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 furnace if the limit is exceeded. The 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
• Standard sizes with furnace chambers up to 2500 liters
• 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, floor 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

Pit-type furnaces with air circulation offer the advantage of easy charging, for heat treatment of heavy parts or loads in charge baskets. With maximum application temperatures available from 450 °C to 850 °C, these compact furnaces are particularly useful for processes such as tempering, solution annealing, artificial ageing, and soft annealing.

• Tmax 450  °C, 650  °C, 850  °C
• Air circulation fans in the furnace bottom, high circulation rate
• Vertical air circulation with square air heating chamber
• Temperature uniformity up to ∆T 8 K according to DIN 17052-1
• Interior walls from stainless steel
• Switchgear with solid-state relays

Additional equipment

• Charging hoist with swivel arm and charge basket
• Optimization of the temperature uniformity up to +/- 2 °C according to DIN 17052-1
• Integrated fan for rapid cool down or separate cooling station for retort box cooling outside of the furnace
• Retort box with protective gas inlet and outlet for production in a defined atmosphere
• Manual or automatic gas supply systems for non-flammable protective or reaction gases

Due to their robust design, these pit-type furnaces with air circulation are particularly useful for a professional heat treatment demanding optimum temperature uniformity. Production processes such as tempering, solution annealing, artificial ageing, and soft annealing can be realized with these pit-type furnaces.

• Tmax 600  °C or 850  °C
• Useful for heavy charge weights
• Air circulation fans in the furnace lid, high circulation rate
• Heating chamber with air baffle cylinder
• Heating elements on all wall surfaces
• Distribution of air flow through grid at the furnace floor
• Pneumatic or hydraulic lid lifting device
• Temperature uniformity up to ∆T 6 K according to DIN 17052-1

Additional equipment

• Integral fan for fast cooling
• Optimization of the temperature uniformity up to +/- 2 °C according to DIN 17052-1
• Variable rpm converter control of the air circulation velocity for sensitive parts
• Multiple zone control or special air circulation system for optimum temperature uniformity tailored to the charge
• Charge weights up to 7 tons
• Designed for Tmax 950  °C, fan blade driven indirectly via a belt to protect the air recirculation motor against over-heating
• Process control and documentation with Controltherm MV software package

Our top-loading furnaces are perfectly suited for the heat treatment of longer or heavier components. The furnace is usually charged with a factory crane. Due to their high-performance air recirculation system, the furnaces provide for excellent temperature uniformity up to a maximum temperature of 850 °C. The top-loading furnaces for the temperature range up to 1280 °C provide for very good temperature uniformity due to their five-side heating. Alternatively, these furnaces can also be provided with gas heating. Customized dimensions are designed and produced to accomodate the size and weight of the components to be treated.

• Tmax 260  °C, 450  °C, 600  °C or 850  °C for furnaces with air recirculation
• Tmax 900  °C or 1280  °C for furnaces with radiant heating
• Electrically heated or gas-fired
• Heating from both long sides for furnaces with air recirculation
• Heating from all four sides and the floor with SiC plates in the floor as level stacking support for models to bis 900  °C or 1280  °C
• High-quality insulation, adapted to the specific maximum temperature
• Electrohydraulic opening system of the lid with two-hand operation
• Closable air supply vents in the lower area of the furnace chamber
• Closable exhaust air flaps in the lid
• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equipment

• Motor-driven exhaust air flaps for faster cooling
• Controlled fan cooling with motor-driven exhaust air flaps
• Multi-zone control of the heating provides for optimum temperature uniformity
• Furnace chamber can be devided in length for short workparts, partitions can be controlled separately
• Designed for Tmax 950  °C, fan blade driven indirectly via a belt to protect the air recirculation motor against over-heating
• Process control and documentation with Controltherm MV software package

The air circulation bogie hearth furnaces W 1000/60A - W 8300/85A are used when heavy charges weighing up to more than 25 t have to be heat-treated. They are ideal for processes such as solution annealing, artificial ageing, annealing or soft annealing, for which a high degree of temperature uniformity is crucial. The high-performance air circulation assures that the temperature uniformity achieved throughout the usable space is outstanding. A broad selection of additional equipment enables these furnaces to be optimally adapted to suit specific processes.

• Tmax 600  °C or 850  °C
• Dual shell housing with rear ventilation provides for low shell temperatures for the 850  °C models
• Swing door hinged on the right side
• Heating from chrome steel heating elements for the 600  °C models
• Heating from three sides (both side walls and the trolley) for the 850  °C models
• High-performance air circulation fan with vertical circulation
• Temperature uniformity up to ∆T 10 K according to DIN 17052-1
• Bottom heating protected by SiC tiles on the bogie providing level stacking surface for the 850  °C models
• Furnace chamber fitted with inner sheets made of stainless steel 1.4301 for 600  °C models and of 1.4828 for 850  °C models
• Insulation structured with high-quality mineral wool for 600  °C models
• Insulation made of high-quality, non-classified fiber material for 850  °C models
• Bogies with flanged wheels running on rails for easy and precise movement of heavy loads
• Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads from model W 4800
• Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load

Additional equipment

• Direct gas heating or upon request with indirect gas heating with radiation tube
• Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads up to Model W 4000
• Optimization of the temperature uniformity up +/- 3 °C according to DIN 17052-1
• Bogie running on steel wheels with gear rack drive, no rails in front of the furnace necessary
• Different possibilities for an extension to a bogie hearth furnace system:
  • Additional bogies
  • Bogie transfer system with parking rails to exchange bogies running on rails or to connect multiples furnaces
  • Motor-driven bogies and cross-traversal system
  • Fully automatic control of the bogie exchange
• Electro-hydraulic lift door
• Motor-driven exhaust air flaps, adjustable via the program
• Uncontrolled or controlled cooling system with frequency-controlled cooling fan and motor-driven exhaust air flap
• Multi-zone control adapted to the particular furnace model provides for optimum temperature uniformity in the 850  °C models
• Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization
• Designed for Tmax 950  °C, fan blade driven indirectly via a belt to protect the air recirculation motor against over-heating
• Process documentation and control with Controltherm MV software package, NTLog and NTGraph or Nabertherm Control Center (NCC) for monitoring, documentation and control