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

In stock
Item Number: OTF-1200X-ML76-UL
Transported by LTL Freight (Truck)


Upgrade to Eurotherm Temp Programmer (single zone) Upgrade + 15" Laptop + Accessories Kit
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 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.
  • Special refractory coating on iiner and heating element 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  oC /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
  • MET Certified

Temperature controller (optional)

  • MTS02-Y Temperature control software kit (for YD518P series controllers) + 15" laptop package is available at the options bar. Click for the detail information about the MTS02-Y software kit. 
  • You may upgrade the temperature controller to the Eurotherm 3504 Temperature Controller which is fully compatible with LabVIEW. This package includes a Eurotherm 3504 programmer, a communication cable (RS485 - USB) and a software CD. Click the pic below to view the full spec of Eurotherm 3504 temperature controller.

Temperature Accuracy

 +/ - 1°C

Vacuum Seal & Upgrade

Fitting Ports
  • To achieve 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  inch


 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.)
  • 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. (please click marks below to learn details )


(click on the right to see detail)

Application Notes

Click here to learn more about the installation of a gas regulator.
  • The tube furnaces with mullite tube are designed for using under vacuum and low pressure < 0.02 MPa / 0.2 Bar/ 3 PSI 
  • 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 limit definition for all mullite tube furnaces: * 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



Item No.



  Quick Link
EQ-F-T-block-70 Alumina Foam Block:  (one pair) for 60mm dia. Tube Furnace

2 sets

EQ-FL-82  Vacuum Flange for 80mm dia. Tube Furnace

1 set

EQ-TM-76D-42L-LD   OD: 3'' x ID: 2.75''  x Length: 40'' (inch)  Mullite Tube



 Hex Wrench

1 set


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