Standard Equipment for all Models

Graphite heating chamber

Molybdenum heating chamber

Tungsten heating chamber

Ceramic fiber insulation

Basic version

  • Standard furnace sizes 8 - 500 liters
  • A water-cooled stainless steel process reactor sealed with temperature-resistant o-rings
  • Frame made of stable steel profiles, easy to service due to easily removable stainless steel panels
  • Housing of the VHT 8 model on castors for easy repositioning of furnace
  • Cooling water manifold with manual stopcocks in supply and return lines, automatic flowmeter monitoring, openloop cooling water system
  • Adjustable cooling water circuits with flowmeter and temperature indicator and overtemperature fuses
  • Switchgear and controller integrated in furnace housing
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2
  • Manual operation of the process gas and vacuum functions
  • Manual gas supply for one process gas (N2, Ar or non-flammable forming gas) with adjustable flow
  • Bypass with manual valve for rapid filling or flooding of furnace chamber
  • Manual gas outlet with overflow valve (20 mbar relative) for over-pressure operation
  • Single-stage rotary vane pump with ball valve for pre-evacuating and heat treatment in a rough vacuum to 5 mbar
  • Pressure gauge for visual pressure monitoring
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Tmax 2400  °C for VHT 40/..-GR and larger
  • Housing, optionally divisible, for passing through narrow door frames (VHT 08)
  • Manual gas supply for second process gas (N2, Ar or non-flammable forming gas) with adjustable flow and bypass
  • Inner process box made of molybdenum, tungsten, graphite or CFC, especially recommended for debinding processes. The box is installed in the furnace with direct gas inlet and outlet and provides for better temperature uniformity. Generated exhaust gases will be directly lead out the inner process chamber during debinding. The change of gas inlet pathes after debinding results in a cleaned process gas atmosphere during sintering.
  • Charge thermocouple with display
  • Temperature measurement at 2200  °C models with pyrometer and thermocouple, type S with automatic pull-out device for precise control results in the low temperature range (VHT 40/..-GR and larger)
  • Two-stage rotary vane pump with ball valve for pre-evacuating and heat-treating in a fine vacuum (up to 10 2 mbar)
  • Turbo molecular pump with slide valve for pre-evacuation and for heat treatment in a high vacuum (up to 10 5 mbar) including electric pressure transducer and booster pump
  • Other vacuum pumps on request
  • Heat exchanger with closed-loop cooling water circuit
  • Automation package with process control H3700
    • 12" graphic touch panel
    • Input of all process data like temperatures, heating rates, gas injection, vacuum at the touch panel
    • Display of all process-relevant data on a process control diagram
    • Automatic gas supply for one process gas (N2, Ar or non-flammable forming gas) with adjustable flow
    • Bypass for flooding and filling the chamber with process gas controlled by the program
    • Automatic pre- and post programs, including leak test for safe furnace operation
    • Automatic gas outlet with bellows valve and overflow valve (20 mbar relative) for over-pressure operation
    • Transducer for absolute and relative pressure
  • Mass flow controller for alternating volume flow and generation of gas mixtures with second process gas (only with automation package)
  • Partial pressure operation: protective gas flushing at controlled underpressure (only with automation package)
  • Process control and documentation via VCD software package or Nabertherm Control Center (NCC) for monitoring, documentation and control