For processes such as normalizing, ageing, curing, or preheating that include a heat treatment of heavy charges, we recommend our low-temperature bogie hearth furnaces. These furnaces are available for maximum working temperatures of 260 °C or 450 °C. They can be heated either electrically or with gas.

• Maximum temperatures of 260 °C or 450 °C
• Bogie on rails for weights up to 50 tons
• Swing door hinged on the right
• Heated electrically (W) or with gas (WB)
• Electrical heating of the furnace 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
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 6 K
• Powerful fan with vertical air circulation
• Optimal air circulation with help of adjustable air outlets tailored to charge requirement
• Air inlet and exhaust air vent, manually adjustable
• High circulation rate for fast and steady heat transfer
• Furnace chamber lined with alloy 314 (AISI)/(DIN material no. 1.4841) stainless steel on 450 °C models
• Over-temperature limit controller with adjustable cutout temperature for thermal protection class in accordance with EN 60518-2 as temperature limiter to protect the oven and load

Additional Equipment

• Electro-hydraulic vertical lift-door
• Horizontal air circulation for optimal temperature control throughout the useful height
• Electrical bogie drive
• Second door in combination with second bogie for optimal charging and faster process turnaround
• Automatic bogie movement systems
• Cooling fan for shorter process times
• Automatic control of exhaust air vents for optimal cooling of the furnace chamber
• Recuperator systems for exhaust heat recovery available on gas-heated models
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 6 K on models with multiple zones of control
• Support structure made from heat-resisting cast alloy steel for high charge weights
• Heat resistant boxes for protective gas or carburizing processes
• Process and charge documentation via Controltherm software or PLC-based control system
• Custom dimensions up to 30,000 liters
• Fixed furnace hearth and movable furnace (envelope concept) for precise loading of heavy charges up to 100 tons

For processes such as solution annealing, artificial ageing, or soft annealing requiring high temperature uniformity and optimum charging ability for heavy charge weights, we recommend bogie hearth furnaces with air circulation.

• Maximum temperatures of 650 °C or 850 °C
• Bogie on rails
• Swing door hinged on the right
• Electrically heating of two sides and bogie
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 14 K
• Powerful fan with vertical air circulation
• Air baffles at furnace sides for optimal air circulation
• Over-temperature limit controller with adjustable cutout temperature for thermal protection class in accordance with EN 60519-2 as temperature limiter to protect the oven and load

Additional Equipment

• Powerful direct gas heating
• Fixed hearth and movable furnace (envelope concept) for heavy charges up to 100 tons
• Electro-hydraulic vertical lift-door
• Horizontal air circulation for optimal temperature throughout the useful height
• Electrical bogie drive
• Second door in combination with second bogie for alternating operation and optimal charging
• Fully automatic bogie change
• Fan system for faster cooling
• Automatic control of exhaust air vents for optimal cooling of the furnace chamber
• Optimal temperature uniformity (according to DIN 17052-1) up to ΔT 6 K on models with multiple zones of control
• Support structure made from heat-resisting cast alloy steel for high charge weights
• Heat-resistant boxes for protective gas or carburization processes
• Process and charge documentation via Controltherm software or PLC-based control system
• Custom dimensions up to 30,000 liters

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.

• Maximum temperatures of 450 °C, 650 °C, 850 °C
• Air circulation fans in the furnace bottom, high circulation rate
• Vertical air circulation with square air heating chamber
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 4 K
• Interior walls from stainless steel
• Switchgear with solid-state relays

Additional Equipment

• Charging hoist with swivel arm and charge basket
• 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

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

• Maximum temperature of 750 °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
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 4 K

Additional Equipment

• Integral fan for fast cooling
• 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
• Custom dimensions up to 10,000 liters
• Charge weights up to 7 tons

These low-temperature chamber furnaces are available for maximum working temperatures of 260 °C or 450 °C. They can be used for various processes such as preheating, drying, curing, artificial ageing, soft annealing, and tempering. These furnaces are suited for use with baskets, pallets as well as mobile furnace racks. The charging can be carried out with fork lift, pallet truck or charging trolley. All furnaces are available with electric or gas heating.

• Maximum Temperatures up to 260 °C or 450 °C
• Heated electrically or with gas
• Electrical 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
• Available with horizontal (type/HA) or vertical air circulation (type/A) for optimal uniformity in your charge
• Ground level charging without floor insulation for 260 °C models
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 10 K
• Optimal air circulation for your charge by means of adjustable air outlets
• Furnace chamber lined with alloy 314 (AISI)/(DIN material no. 1.4841) for 450 °C models
• Low shell temperature by means of high quality mineral wool insulation
• Manually adjustable air inlet and exhaust air vent
• High air exchange for fast drying processes
• Furnace sizes suitable for common charging systems, such as pallets, baskets, etc.
• Double-wing door for furnaces N 1500/.. and larger
• Over-temperature limit controller with adjustable cutout temperature for thermal protection class in accordance with EN 60519-2 as temperature limiter controler to protect the oven and load

Additional Equipment

• Optional floor insulation for improved temperature uniformity on 260 °C models
• Entry ramp or track cutouts for floor-level charging of models with insulated bottom
• Electro-hydraulic lift-door
• Fan system for faster cooling with manual or automatic control
• Automatic control of exhaust air vents for better ventilation of the furnace chamber
• Window and furnace chamber illumination
• Safety technology according to EN 1539 for charges containing solvents
• Catalytic or thermal exhaust gas cleaning systems
• Custom sizes up to 30,000 liters and charge weights up to 30 tons

These classic chamber furnaces with air circulation offer remarkable temperature accuracy and are therefore particularly useful for processes such as tempering, curing, solution annealing, artificial ageing, preheating, and soft annealing. With their modular design, these furnaces can be equipped with useful accessories, allowing nearly limitless customizations for all your different process conditions.

• Maximum temperatures of 450 °C, 650 °C, or 850 °C
• Horizontal air circulation
• Swing door hinged on the right
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 6 K
• Heating from bottom, sides and top
• Optimum air flow and temperature uniformity through high circulation rates
• One shelf and rails for two additional shelves included
• Air baffle box of stainless steel inside the furnace chamber for optmum air circulation
• Switchgear with solid-state relays

Additional Equipment N 30/45HA - N 500/85HA

• Cooling system with fan for fast cooling
• Automatic control of air inlet and exhaust air vents for better ventilation and faster cooling of the furnace
• Pneumatic lift-door
• Atmosphere boxes for protective gas operation
• Additional shelves
• Variable frequency control of air circulation velocity for sensitive parts
• Charging aids, roller conveyors
• Custom sizes up to 10,000 liters and charge weights up to 10 tons

For some heat treatment processes it is important to reduce dust contamination in the furnace chamber down to a minimum. To achieve highest protection for these applications these specific chamber furnaces with welded inner box and insulation fully covered with stainless steel sheets are recommended.

• Horizontal airflow
• Sealed housing
• Insulation covered with stainless steel sheets
• Optimum temperature uniformity at 250 °C - 650 °C of up to ΔT 6 K in accordance to DIN 17052-1
• Operation under protective gases as an option

If liquid solvents are present in the materials heat treated, this line of furnaces may be equipped with additional safety technology according to EN 1539 for processing at temperatures up to 450 °C.

Using annealing boxes, you can operate our standard air circulation furnaces, models N 30/45 HA - N 500/85 HA and models S 30/45 A - S 500/85A, under a defined protective atmosphere. This allows processes such as bright annealing, annealing under protective gas, or curing of copper alloys. On standard models, the boxes are equipped with a lid and a protective gas inlet and outlet. The lid is sealed by means of a sealing groove with a fibre gasket before loading into the furnace. The furnace is equipped with a special pass-through for the box inlet and outlet connections. The box inlet is connected to a gas supply panel. We have gas supply panels available for either manual or automatic control. As a vacuum model, the box allows air evacuation in cold condition before refilling with protective gas. This system is particularly useful for bright annealing of bulk materials, since the oxygen can be more efficiently removed from the box by means of pre-evacuation than through purging alone. In our modern research center we can carry out tests and experiments to demonstrate how these boxes perform with your materials.

• Protective gas inlet and outlet
• Sealing groove with fibre gasket
• Made of high heat-resistant stainless steel alloy 314 (AISI)/(DIN material no. 1.4841)

Additional Equipment

• Reinforced box with special seals for room-temperature vacuum use, particularly useful for bulk material heat treatment and low pre-purging gas consumption
• Vacuum pumping station for box evacuation, including connection set and three-way valve
• Gas supply panel with manual or automatic controls

Based on the standard furnaces N 30/65 HA et. al., these furnace models with air circulation are equipped with a specially sealed housing and protective gas inlet and outlet. The furnaces can be used for inert gas heat treatment allowing tempering, annealing under protective gas, and curing. You can use them also for heat-treating magnesium under certain conditions. While these furnaces are not appropriate for furnaces that require a high-purity atmosphere, they offer a compelling value for more forgiving processes.

• Maximum temperature of 650 °C
• Horizontal air circulation
• Optimum temperature uniformity (according to DIN 17052-1) up to ΔT 6 K
• Manual gas supply panel with pressure reducer and flow meter for use with all non-combustible protective gases such as nitrogen, argon or forming gas
• Heating from bottom, sides and top
• High gas circulation rate for optimal uniformity
• Supplied standard with one shelf and rails for two additional shelves
• Air baffle box of stainless steel inside the furnace chamber for optmum air circulation
• Switchgear with solid-state relays

Additional Equipment

• Automatic gas supply panel, including pressure reducer, flow meter, solenoid valves, timer
• Additional shelves
• Charging aids, roller conveyor

Certain processes release solvents or evolve other flammable vapors when heat is applied. The concentration of these vapors must be kept below a certain limit to prevent ignition. European Norm EN 1539 (formerly VGB4) and NFPA 86 in the USA proscribe the required safety equipment for these processes. For appropriate applications and processes, all air circirculation furnaces of the series N ..HACLS (pages 10, 11 and 13) are available with safety technology for protection of ignition in the furnace chamber. To prevent ignition, 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 a defined suction flow. A measurement system monitors this flow. In parallel, the furnace atmosphere is diluted by the inflow of fresh air. The air circulation is also monitored by the measurement system. Furnaces with a capacity greater than 1000 liters are additionally equipped with an explosion pressure relief.

• Defined and monitored exhaust air flow
• Powerful exhaust fan capable of maintaining negative furnace pressure
• Defined and monitored air circulation flow
• Emergency Stop Button
• Visual and audible emergency signals
• Over-temperature limit controller with adjustable cutout temperature for thermal protection class in accordance with EN 60519-2 as temperature limiter to protect the oven and load

With their maximum working temperature of 300 °C and forced air circulation, the TR series ovens achieve very good temperature uniformity. They can be used for various applications such as e.g. drying, sterilizing or warm storing. The stainless steel interior chamber is easy to clean and resistant to rust.

• Tmax 300 °C
• Operating range, room temperature + 5 °C to 300 °C
• Models TR 60 - TR 240 designed as tabletop models
• Models TR 420 and TR 1050 designed as floor standing models
• Horizontal, forced air circulation results in temperature distribution better than ΔT 8 K
• Stainless steel chamber, material 1.4301, rust-resistant and easy to clean
• Charging in multiple layers possible using removeable trays (number of removeable trays included, see table below)
• Large, wide-opening swing door, hinged on the right with quick release for models TR 60 - TR 420
• Double swing door with quick release for TR 1050
• Exhaust vent in the rear wall
• PID microprocessor control with self-diagnosis system
• Silent solid-state power control relays

Additional Equipment

• Over-temperature limit controller with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
• Window for charge observing
• Further removeable trays with rails