Top Hat Furnaces or Bottom Loading Furnaces with Wire Heating up to 1400 °C

The heating from all four sides and the table provides for very uniform temperatures.

Process Control

Function and equipment

H1000LB
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H500LT.png
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H500DB200
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Compared to chamber furnaces, the top hat and bottom loading furnaces are offering the advantage of convenient loading and unloading of complex charge setups on a compact footprint. The widely opening electrically or hydraulically driven hood allows for good access to the usable space. Depending on the process conditions, a top hat or bottom loading design is recommended. The system can be upgraded to include one or more tables that are manually or electrically driven. Adding further additional equipment, such as multi-zone controls to optimize temperature uniformity or controlled cooling systems to shorten process times, the furnaces can be individually adapted to the process requirements.

  • Tmax 1280 °C
  • Dual shell ventilated housing made of textured stainless steel sheets for low surface temperature and high stability
  • Top hat furnaces (model LT): Electric or hydraulic hood drive with fixed table
    Bottom loading furnaces (model LB): driven table and fixed top hat
  • Five-sided heating from all four sides and from the table provides for a temperature uniformity up to +/− 5 °C according to DIN 17052-1 
  • Heating elements on support tubes provide for free heat radiation and long service life
  • Bottom heating protected by SiC tiles with an even stacking base
  • Multi-layer insulation consisting of lightweight refractory bricks backed by special insulation
  • Long-life ceiling design with fiber insulation
  • Automatic exhaust air flap on the furnace roof
  • Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and load
  • 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.
  • Defined application within the constraints of the operating instructions
  • Controller with touch operation C540 (10 programs with each 20 segments)
  • NTLog Basic for Nabertherm controller: recording of process data with USB‑flash drive 
  • Freeware NTEdit for convenient program input via ExcelTM for WindowsTM on the PC
  • Freeware NTGraph for evaluation and documention of firings using ExcelTM for WindowsTM on the PC
  • MyNabertherm App for online monitoring of the firing on mobile devices for free download

Additional equipment

  • Tmax to 1400 °C
  • Cooling system with fresh air fan for rapid cooling
  • Sides with fiber insulation to reduce cycle times
  • Fabric cover on the fiber roof (and sides) to reduce fiber dust
  • Protective gas connection for purging the furnace with non-flammable process gases
  • Automatic gas supply systems
  • Multi-zone control adapted to the particular furnace provides model for optimal temperature uniformity
  • Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization
  • Additional tables, table changing system, also motorized
  • Exhaust air and exhaust gas piping
  • Process control and documentation via VCD software package for monitoring, documentation and control

Technical specifications

Model

Tmax

Inner dimensions in mm

Volume

Outer dimensions2 in mm

Heating
power in

Electrical

Weight

 

°C

w

d

h

in l

W

D

H

kW1

connection

in kg

H 125/LB, LT

1280

800

400

400

125

1550

1500

2200

12

3-phase

1250

H 250/LB, LT

1280

1000

500

500

250

1530

1700

2300

18

3-phase

1400

H 500/LB, LT

1280

1200

600

600

500

2020

1800

2500

36

3-phase

1800

H 1000/LB, LT

1280

1600

800

800

1000

2200

2000

2900

48

3-phase

2800

H 1350/LB, LT

1280

2800

620

780

1360

3750

2000

3000

75

3-phase

3500

H 3000/LB, LT

1280

3000

1000

1000

3000

4100

2500

3500

140

3-phase

6200

1Depending on furnace design connected load might be higher
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.

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