Basic version

• Standard furnace sizes 8, 40 and 100 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
• H 700 PLC control with clearly laid out 5.7“ touchpanel control for program entry and display, 10 programs each with 20 segments
• Over-temperature limit controller with manual reset for thermal protection class in accordance with EN 60519-2
• Manual operation of the process gas and vacuum functions
• Manual gas supply for one process gas (N2 or Ar) with adjustable flow
• Bypass with manual valve for rapid filling or flooding of furnace chamber
• Manual gas outlet with overflow valve (20 mbar relative)
• 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

Additional equipment

• Tmax 2400 °C
• Housing, optionally divisible, for passing through narrow door frames (VHT 08)
• Manual gas supply for second process gas (N2 or Ar) with adjustable flow and bypass
• Molybdenum or carbon-fiber-carbon retort with direct gas supply for clean atmosphere and improved temperature uniformity in the furnace chamber
• Charge thermocouple with display
• Two-stage rotary vane pump with ball valve for pre-evacuating and heat-treating in a vacuum to 10-2 mbar
• Temperature measurement at 2200 °C with pyrometer and thermocouple, type S with automatic pull-out device for precise control results in the low temperature range
• Turbo molecular pump with slide valve for pre-evacuation and for heat treatment in a vacuum to 10-5 mbar including electric pressure transducer and booster pump (only VHT…/MO)
• Heat exchanger with closed-loop cooling water circuit
• Automation package with graphic touch panel H 3700
  • 12" graphic touch panel H 3700
  • 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 or argon) 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)
  • Transducer for absolute and relative pressure
• MFC 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)
• PC control via NCC with corresponding optional documentation and connection to customer PC networks