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1500°C Three Zone Split Tube Furnace with Flange & Mullite Tube (84mmO.D.) - OTF-1500X-III-UL

In stock
Item Number: OTF-1500X-III-UL
Transported by LTL Freight (Truck)


OTF-1500X-III- is a split three-zone tube furnace with mullite tube and conventional flange working up to 1500°C. Three 30 segments temperature controllers are installed with S type thermal couples and  +/ - 1°C accuracy. It is an excellent furnace for exchanging processing tube for multi-purpose.  

Note: New safety feature: An interlock system has been integrated into the furnace structure since June.2015

Power Input 9KW
Working Voltage  AC220V Single phase 50/60Hz ( 50 A breaker required)
Max. Working Temperature 1500°C 《 1 hours
Continuously Working Temperature 1400°C
Optional:  1600°C working temperature available at extra cost using Kathal 1650°C grade SiC heating rod
Recommend Heating rate 5°C/min.
Processing Tube
Material:  Mullite ceramic   Made in the USA
Size:   84 O.D x 73 I.D x 1219mm L 
Heat Zone Length
  • Three heating zones:  200 mm / each  (Included 20 mm spacing)
  • Total heating zone length:  600 mm  
  • Constant Temperature Zone length:   350mm  (If set 3 zone at same temperature) +/- 2ºC.
  • Accept processing tube up to 100 mm diameter

Temp. Profile at 1450ºC

84mm O.D Tube
(click to enlarge)
Overall Dimensions 860 mmL × 380 mmW × 680 mmH
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 allows for operation without attendant(s).
  • +/- 1 ºC temperature accuracy.
  • Three S-type thermocouples (one for each zone).
  • RS485 Communications Port.
  • Optional:  
    • The furnace may be operated by 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 to order a computer laptop from us to avoid software installation problems. For more information please click here.
Vacuum Level
  • 10E-2 torr by quality mechanical vacuum pump
  • 10-5 torr by molecular pump

Thermal Block Placement
  • Two thermal blacks are included . Please picture below tolearn how to place them inside tube
  • You may order flange support to avoid tube rotating ( click Pic below right )
Heating Elements & Thermal couples              
Net Weight 110 Kg

Application Notes
  • The tube furnaces with mullite tube are designed for using under vacuum and low pressure < 0.02 Mpa / 0.2 Bar/ 3 PSI 
  • Never use graphite crucible in alumina 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. Please click here to learn the installation of a gas regulator. 
  • The flow rate for gases should be limited to < 200 SCCM ( or 200ml/min )
  • Vacuum limit definition for all mullite tube furnaces: * Vacuum pressures may only be safely used up to 1300°C
Dimensions Furnace only: 35" × 23" × 30"
Operation Instructions

  • 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 One Year Limited Warranty.

  • CE Certified
  • All electric components ( >24V) are UL / MET / CSA certified
  • The furnace is ready to pass TUV(UL61010) or CSA certification at extra cost. ( pls click mark below to learn details )

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1. Prices listed online are valid for US market and whom pay by credit card only. There will be extra charges for shipping & handling. Price various from country to country.
2. We may add extra charges for paper order and net30 terms due to extra labor cost.
3. The prices listed are subject to change without notice.