Top Loading Furnaces

With their adapted heating and the special arrangement of the heating elements, the furnaces ensure good temperature uniformity. 

Process Control

Function and equipment

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S11988S
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Top loading furnaces are ideal for tempering quartz glass. With smaller components, the furnaces are filled manually from the top and, with larger or heavier components, they are filled with the help of an indoor crane. With their adapted heating and the special arrangement of the heating elements, the furnaces ensure good temperature uniformity. With an extensive range of additional equipment, top loading furnaces can be adapted to suit many different process requirements. 

  • Tmax 900 °C or 1240 °C
  • Three or five-sided heating for optimum temperature uniformity
  • Heating elements on carrier tubes ensure free heat radiation and a long service life
  • Multi-layer refractory insulation and special rear 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.
  • Bottom heating protected by SiC tiles with an even stacking base
  • Fiber insulation in the lid
  • Lids are opened and closed with various standardized solutions
  • Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and charge
  • Over-temperature limiter with adjustable cutout temperature  as temperature limiter to protect the oven and load
  • Defined application within the constraints of the operating instructions
  • Controller C540 (10 programs with each 20 segments)

Additional equipment

  • Manual fresh air opening in lower area of the top loading furnace
  • Manual exhaust air opening in the lid
  • Automatic exhaust air flap for faster cooling
  • Cooling system to speed up furnace cooling with a fan and specified temperature gradients or a fixed volume of fresh air. Both operating modes can be activated for different segments, using an extra function of the controller.
  • Multiple-zone control of the heating to optimize temperature uniformity
  • Fabric cover to reduce fiber dust
  • Split lid to divide the furnace chamber into two halves
  • Special solutions with customer-specific dimensions and equipment options are available
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control

Technical specifications

Model Tmax Inner dimensions in mm Volume Outer dimensions1
in mm
Heating power Electrical Weight
  °C w d h in l W D H2 in kW3 connection in kg
S 220/G 900 2450 300 300 220 3000 1000 2000 18 3-phase 1000
S 430/G 900 1200 600 600 432 1900 1300 2200 24 3-phase 1100
S 500/G 900 2450 450 450 500 3000 1100 2000 26 3-phase 1600
S 620/G 900 3050 450 450 620 3860 1100 2000 30 3-phase 2200
S 750/G 900 3000 500 500 750 3860 1500 2100 36 3-phase 2600
                       
S 220 1240 2450 300 300 220 3000 1000 2000 24 3-phase 1250
S 430 1240 1200 600 600 432 1900 1300 2200 30 3-phase 1400
S 500 1240 2450 450 450 500 3000 1100 2000 36 3-phase 1800
S 620 1240 3050 450 450 620 3860 1100 2000 40 3-phase 2400
S 750 1240 3000 500 500 750 3860 1500 2100 57 3-phase 2800
1External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
2Height with lid open
3Depending on furnace design connected load might be higher

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Customer Test Center

What furnace is the right choice for this specific process? This question cannot always be answered easily. Therefore, we have set up our modern test center which is unique in respect to size and variety. A representative number of furnaces is available for tests for our customers.