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1500C Two Zone Split Tube Furnace with Flange & Mullite Tube (80 mm) - OTF-1500X-II

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Item Number: OTF1500XII
Transported by LTL Freight (Truck)


Upgrade to Eurotherm Temp Controllers (Dual )
OTF-1500X-II is a split two-zone tube furnace with a mullite tube and conventional flange working up to 1500°C. Two 30 segments of temperature controllers are installed with S-type thermal couples and  +/ - 1°C accuracy. It is an excellent furnace for exchanging processing tubes for multi-purpose.  

Power Input 6KW
Working Voltage  208V - 240V AC Single-phase 50/60Hz ( 40 A breaker required)
 Working Temperature 1500°C Max. for a short time
1400°C  Continuously
Recommend Heating rate 5°C/min.
Processing Tube
  • Material:  Mullite ceramic made in the USA
  • Size: 80 O.D x 73 I.D x 1000 mm L
  • Stainless steel vacuum sealing flange with valve and meter is included
  • The thermal block is included. See the picture below middle for details
  • You may order flange support to avoid tube rotating (click the picture below right)

    click here to order spare       

Heat Zone Length
  • Two heating zones:  200 mm/ each  (including 20 mm spacing)
  • Total zone length:  390 mm  
  • Constant Temperature Zone length:   200mm  (if set 2 zones at the same temperature) +/- 2ºC.
  • Accept processing tubes up to 100 mm in diameter

Temp. Profile at 1400ºC
  (click to enlarge)
Overall Dimensions 650L × 540 W × 755 H (mm)
Temperature Controllers
  • PID automatic control with 30 programmable segments for precise control of heating rate, cooling rate, and dwell time.
  • Built-in overheating & broken thermocouple protection.
  • Over-temperature protection and alarm allow for operation without attendant(s).
  • +/- 1 ºC temperature accuracy.
  • Two S-type thermocouples (one for each zone).
  • RS485 Communications Port.
  • Optional:  
    • The furnace may be operated by a PC by installing a control module. Please order an MTS-02 control module at extra cost. 
    • If you order the PC control module together with the furnace, we will install and test it before shipping. We recommend you order a computer laptop from us to avoid software installation problems. For more information please click here.
Vacuum Level
  • 10E-2 torr by a quality mechanical vacuum pump
  • 10-5 torr by the molecular pump
Heating Elements & Thermal couples
  • 16 pcs  1500ºC grade Silicon carbide rod (14 mm Dia. x 150 mm heating x 413 mm length), which is consumable, and not covered by warranty. Please click the picture below left to order spare and replacement
  • 2 pcs S type thermal couple built-in
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 the user 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.
Net Weight 110 Kg

Application Notes

Click here to learn more about the installation of a gas regulator.
  • The tube furnaces with mullite tubes are designed for use under vacuum and low pressure < 0.02 Mpa / 0.2 Bar/ 3 PSI. Vacuum pressures may only be safely used up to 1300°C. The flow rate for gases should be limited to < 200 SCCM for reducing thermal shock to the tube.
  • 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 about 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.

  • One-year limited warranty with lifetime support (consumable parts such as processing tubes, and O-rings are not covered by the warranty, please order replacements at related products below.).  
  • ATTENTION: Any damages caused by the use of corrosive and acidic gases are not under the coverage of MTI's One Year Limited Warranty.
  • CE Certified
  • NRTL or CSA certification is available upon request at extra cost. 
Operation Instructions       

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1. Prices listed online are valid for the US market and who pay by credit card only. There will be extra charges for shipping & handling. Prices vary from country to country.
2. We may add extra charges for paper orders and NET 30 terms due to extra labor costs.
3. The prices listed are subject to change without notice.