UL Standard Split Long Tube Furnace with 5" Dia Quartz Tube (36" Heating Zone) & Vacuum Flanges - OTF-1200X-5L

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Product Number: OTF-1200X-5L


OTF-1200X-5L is a UL Standard split-able single-zone tube furnace which can achieve fast heating up to 1100°C with a 17" length constant temperature heating zone. The furnace includes one 5" (125 mm) O.D x 55"L fused quartz tube, one pair of vacuum sealing flanges and two vacuum valves & a pressure gauge for immediate use. The precision temperature controllers provides up to 30 segments of heating and cooling steps with +/- 1°C accuracy. It is an excellent furnace for annealing, diffusing and sintering samples in various atmospheres. 


Furnace Structure

  • Double layer steel casing with air cooling keeps furnace surface temperature lower than 60°C.  
  • High purity fibrous alumina insulation for maximum energy saving.
  • Special refractory coating on liner and heating element to increase furnace life.


 7 KW


 AC 208-240 Single Phase, 50/60 Hz

Max. Temperature

 1200° C (<1hr)

Continuous Temperature


Max. Heating Rate

 <= 20  oC /min

Heating Zone Length

 880 mm ( single zone )

Constant Temperature Zone

 440  mm (+/-1° C)

Heating Elements

 Fe-Cr-Al Alloy doped by Mo

Thermocouple Type

 K Type Thermocouple

Temperature Controller
  • MET certified 30 programmable segments for precise control of heating rate, cooling rate and dwell time.
  • Built in PID Auto-Tune function with overheating & broken thermocouple protection.
  • Over temperature protection and alarm allows for operation without attendant(s).
  • +/- 1 ºC temperature accuracy.
  • RS485 Communications Port.
  • Optional:  
    • The furnace may be operated by PC by installing a control module. Please order a 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.
    • You may choose Eurotherm 3504 Programmable Temperature Controller to connect labview software at extra cost ( Click bpic below right to see specs)
Tube Size and Materials
  • Made of high quality Fused quartz with size of 130 mm O.D x 120 mm ID x 1400 mm L
  • Optional tube diameters:  80mm, 100mm
  • Two fibrous ceramic tube blocks are included for blocking heat radiation from inside tube. (Ceramic blocks must be fully inserted into the furnace chamber before heating)
  • Quartz blocks (optional) are ideal for cleaner processing enviroment and higher vacuum efficiency.

             click here to choose a crucible

Vacuum Sealing
  • One pair of SS 304 vacuum flange with double high temperature silicone O-ring is Included/
  • Two needle valves with 1/4" pipe adapter are installed on flanges.
  • One vacuum/ pressure gauge is installed one side flange
  • Vacuum level can reach 10^-2 torr by quality mechanical vacuum pump and 10^-5 torr by molecular pump
  • Optional:
    • You may choose flange with KF25 vacuum port for  faster and better vacuum ,also, please choose quality mechanical pump or digital  molecular pump ( click picture below to order at extra cost )

Sliding Flange  

(Optional at Extra Cost)

  • One sliding flange for transporting samples (manually operated) is available as an option at $1995 extra cost.


  • Referring to picture above, you may need to order two mobile carts to support the sliding device ( click on underlined to order the table).


 1100 X 450 x 670mm

Net Weight

 80  Kg

Shipping Weight

 410 lbs

Shipping Package Size

 60x40x43  i nch


One year limited manufacture warranty with life time support (Consumable parts such as furnace liner, processing tubes, and O-rings are not covered by the warranty, please order replacements at related products below.)

  • CE Certified
  • UL / MET / CSA Certification is available upon request, additional charges will apply
  • Temperature controller is MET and CE Certified

Application Notes
Click here to learn the installation of a gas regulator
  • Tube furnaces with quartz tubes are designed for using under vacuum and low pressure < 0.2 bar / 3 psi / 0.02 MPa
  • Attention: A two stage pressure regulator must be installed on gas cylinder to limit the pressure to below 3 PSI for safe operation. Click here to learn the installation of a gas regulator.
  • Vacuum limit definition for all quartz tube furnaces: * Vacuum pressures may only be safely used up to 1000°C
  • Click here to learn How to set up quartz/ ceramic tube and vacuum flange for MTI Tube furnace. ( also click picture below to see demo video )
  • Please click here to see our typical temperature profile calibration result at various temperatures.  
  • In order obtain accurate temperature inside tube furnace, please click here to learn how to calibrate the temperature on your own.

Operation Instructions



How to set up the furnace

Controller Operation Demo Video

How to create Temperature gradient



Item No.



Quick Link
EQ-F-T-block-125 One pair of Alumina Foam Block for 5" dia. Tube Furnace

2 sets

EQ-FL-125 Vacuum Flange for 5" dia. Tube Furnace

1 set

EQ-QZTube-125GE Quartz Tube: 130ODx120IDx1400 L mm


Wrench Hex Wrench

1 Set





PREMIER SOLUTIONS PTE LTD / MTI CORPORATION - UL Standard Split Long Tube Furnace with 5" Dia Quartz Tube (36" Heating Zone) & Vacuum Flanges - OTF-1200X-5L

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