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1250C Split Tube Furnace with 3" O.D Mullite Tube & Sealing Flange - OTF-1200X-ML76-UL

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OTF-1200X-ML76 is a CE certified split-able Tube furnace installed with 3'' O.D mullite processing tube and a pair of smart stainless steel vacuum sealing flange and valve/gauge which allow to heat sample under vacuum or flowing gas condition up 1250°C. The precision temperature controller can provide 30 segments of heating and cooling steps with +/- 1°C accuracy.    


Furnace Structure

  • Double-layer steel casing with air cooling to keep furnace surface temperature lower than 60°C
  • High purity fibrous alumina insulation for Max. Energy-saving
  • The special refractory coating on inner of furnace to increase furnace life


 2.5  KW


 AC 208-240 Single Phase, 50/60 Hz

Max. Temperature

 1250° C (<2hrs)

Continuous Temperature

 1200°C (Continuous)

Max. Heating Rate

 <= 20°C /min

Tube Size and Materials

Thermal Block Placement


Heating Zone length

 440 mm ( single zone )

Constant temperature zone

 150  mm (+/-1°C)

Temperature Controller

  • FA-YD518P-AG temperature controller is included.
  • Proportional–integral–derivative control (PID control) and auto-tune function
  • 30 segments programmed with ramping, cooling and dwelling steps
  • Built-in over-temperature alarm and thermocouple failure alarm
  • +/- 1 ºC temperature control accuracy
  • Default DB9 PC communication port

Temperature controller (optional)

Vacuum Seal & Upgrade

Fitting Ports
  • To achieve a high vacuum, you may replace the standard barbed hose fitting with the KF25 adapter; please click underline to order.
  • For supplying high purity gas, you may replace the standard barbed hose fitting with the VCR Face Seal Fitting; please click underline to order.

Vacuum Level


Heating Element

 Fe-Cr-Al Alloy doped by Mo


 550 x 380 x 520  mm

Net Weight

 40  Kg

Shipping weight

 250 lbs

Shipping package after crating

 48x40x40  i nch


 One year limited warranty (Consumable parts such as processing tubes, o-rings, and heating elements are not covered by the warranty, please order the replacement at related products below.)

Laptop, software & WiFi
Control (Optional)

  • Brand new laptop with Microsoft Windows 10 and Microsoft Office 2013 (30 days free trial)
  • Labview Based Temperature Control System (EQ-MTS01) enables users to edit temperature profiles, manage heat-treatment recipes, record, and plot data for MTI furnaces.
  • A wireless remote control provides up to 300 meters of operating range.
  • The above features are available upon request at an extra cost (up to $1,000). 
  • Note: The software is only compatible with MTI’s Yudian Temperature Controller

  • CE Certified
  • NRTL or CSA certification is available upon request at extra cost.


Application Notes

Click here to learn more about the installation of a gas regulator.
  • The tube furnaces with mullite tube are designed for use under vacuum and low pressure < 0.02 MPa
  • Attention: A two-stage pressure regulator must be installed on the gas cylinder to limit the pressure to below 3 PSI for safe operation. Click here to learn the installation of a gas regulator. 
  • Never heat the furnace while the gas release valve is closed and a positive pressure condition exists within the furnace chamber. The pressure gauge must be used to closely monitor the chamber condition at all times during the heating process; please open the gas release valve immediately once the chamber pressure has reached over 3 PSI to prevent unforeseeable damages.
  • The flow rate for gasses should be limited to < 200 SCCM ( or 200ml/min )
  • Vacuum pressures may only be safely used up to 1300°C
  • NOTE The mullite tube shall be considered as a consumable part. We strongly recommend user keep spare tubes in order to ensure the continuity of operation. The tube is not covered by Warranty. Use the link to order more. 

Operation Instructions


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