Chamber Furnaces LH

For stress relief annealing after laser sintering, the furnaces are equipped with a protective gas box for non-flammable protective gas, e.g. argon, and a manual protective gas supply with solenoid valve.

Process Control
LH30_14

Function and equipment

LH30_14
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The chamber furnace systems LH 15/12 - LH 60/12 have proven themselves for many years as professional chamber furnaces. For stress relief annealing after laser sintering, the furnaces are equipped with a protective gas box for non-flammable protective gas, e.g. argon, and an automatic gas supply system for flow rates of 4 l – 50 l/min. The design with gas supply box is a cost-effective alternative to retort furnaces and is suitable for many processes. The batch to be annealed is wrapped in annealing/hardening foil during the process to protect it from oxidation and decarburization. To protect the bottom insulation of the furnace from mechanical stress, a charging plate is required when using a gas supply box. 

  • Tmax 1200 °C
  • Recommended operating temperatures up to 1100 °C, at operating temperatures up to 1150 °C increased wear of the protective gas box must be expected
  • High furnace chamber with five-sided heating for very good temperature uniformity
  • Heating elements on support tubes ensure free heat radiation and a long service life
  • Controller mounted on furnace door and removable for comfortable operation
  • Protection of bottom heating and flat stacking surface provided by embedded SiC plate in the floor
  • Dual shell housing made of textured stainless steel sheets with additional fan cooling for low surface temperature
  • Multi-layered insulation of light refractory bricks and special backup insulation
  • Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumino silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.
  • Motorized exhaust air flap
  • Adjustable air inlet in furnace floor
  • Base included
  • Protective gas boxes for inert gas atmosphere with additional thermocouple, type K
  • Automatic gas supply system for flow rates of 4 l – 50 l/min
  • Charge control for measuring the temperature directly at the load in the gas supply box
  • Charging plate and annealing and hardening foils
  • Controller with touch operation P570 (50 programs with each 40 segments)
  • MyNabertherm App for online monitoring of the firing on mobile devices for free download
  • Freeware NTEdit for convenient program input via MS Excel on the PC
  • Freeware NTGraph for evaluation and documention of firings using MS Excel on the PC
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive
  • Defined application within the constraints of the operating instructions

Additional equipment

Additional equipment

  • Process control and documentation via VCD software package for monitoring, documentation and control

Technical specifications

Model Tmax
furnace
Inner dimensions protective gas box in mm Outer dimensions
in mm3
Process flush rate Heating power Electrical Weight Heating time
  in °C w d h W D H l/min in kW connection in kg in min2
LH 15/12 System 1200 100 100 100 680 860 1230 10 - 15 5.0 3-phase1 170 44
LH 30/12 System 1200 170 170 170 710 930 1290 10 - 15 7.0 3-phase1 200 60
LH 60/12 System 1200 250 250 250 790 1080 1370 10 - 15 8.0 3-phase 300 85
1Heating only between two phases
2Heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE rsp. 400 V 3/N/PE)
3External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.

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