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36" Three Zones Split Tube Furnace with Optional Quartz Tube Flanges (3.14" to 5'' O.D, 1200°CMax ) - OTF-1200X-III-UL

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Sale Price: Starting at USD$10,995.00
If you are international, please click this.
Transported by LTL Freight (Truck)

Product Options

Processing tube size:

OTF-1200X-III-UL series furnaces are configurated to meet UL/CSA certificate standard. The furnaces are long, and split-able three-zone tube furnace with tubes up to 127mm (5") O.D capable of quickly heating up to 1200°C. The multiple zones also enable the user to create different thermal gradients by varying the temperature of three zones. The furnace includes one fused quartz tube, one pair of vacuum sealing flanges with pressure gauge & ball valve for immediate use. Three 30 segments temperature controllers are installed with K type thermal couple. Microprocessor-based self-tuning PID control provides excellent temperature control without overshooting along with an accuracy of +/- 1 °C. It is an excellent furnace for annealing, diffusing and sintering samples under various gas atmospheres.


OTF-1200X-4-III-UL OTF-1200X-5-III-UL
Quartz Tube Size
(3.14"D x 55" )
(4" x 55")
(5"x 55")
Heating Zone Length
  • Three zones: 900mm (36") in total,  300mm  (11.8") for each zone
  • Constant Temperature Zone: 25" (625 mm) length (Three zones are heating at equal temperature simultaneously)
Dimensions 1030 x 430 x 580 mm  (not included flange and tube)
Furnace Structure
  • Double layer steel case with two cooling fan, which ensure low surface temperature;
  • Energy saving high purity fibrous alumina insulation;
  • Two fiberous 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 block (Optional) is ideal for more cleaness and higher achievable vacuum.

                 click here to choose a crucible

Rated Voltage
AC 208-240V Single Phase, 50/60 Hz (40A breaker required)
Power cord is included without plug
Power Consumption
7 KW Max.
Heating Elements
Fe-Cr-Al Alloy doped by Mo
Heating Temperature
Max. Heating Temperature: 1200°C
Continuous Heating Temperature: 1100°C
Max. Heating Rate: 20°C/min
Temperature Controller
  • 3 digital temperature controllers certified by MET and CE Certified
  • PID automatic control with 30 programmable segments for precise control of heating rate, cooling rate and dwell time.
  • Built in overheating & broken thermocouple broken 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.
Flange Fittings
  • One pair of SS 304 vacuum flange with double high temperature silicone O-ring  is Included
  • Two needle valves are installed with flange
  • One Vacuum/ pressure gauges 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 , and click picture below to order v acuum pump separately

1700 x 430 x 580 mm  
One year limited warranty with lifetime support. (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 )
Shipping Dimensions
Shipping Weight

Application Notes
Operation Instructions

How to set up the furnace

Controller Operation Demo Video



OTF-1200X-80-III-UL OTF-1200X-4-III-UL OTF-1200X-5-III-UL
SS vacuum flange with O-rings
1 pair

EQ-FL-101 EQ-FL-125
Fused quartz tube
1 pc

EQ-QZTube-80D-1400 EQ-QZTube-101D-1400 EQ-QZTube-125GE-1400
Alumina fiber foam tube block
4 pc

EQ-F-T-block-70 EQ-F-T-block-92 EQ-F-T-block-125
Hook for moving the sample

EQ-FLG-kit-2 EQ-FLG-kit-2 EQ-FLG-kit-2
Metric Hex-wrenches
1 set

Part No.
Quick Link
KF-D25 series Vacuum Suite(vacuum pump, vacuum ball valve, vacuum bellows, quick clamps, KF adapter) Also you may buy individually.
EQ-MTS02 Computerized temperature Control System
Compact Digital Vacuum Gauge & Controller with Power Supply (Up to 10-4 Torr)
High vacuum station (Mechanical pump + turbo molecular pump.)
Gas mix station (Float flow meter / Mass flow meter) (2, 3, 4channels selectable)
Compact Flow Meter (float flow meter / mass flow meter)
Quartz tube block /heat insulating tube block
Quartz Boats /curcible /container /sample holder
Heavy Duty Mobile Car for All MTI Tube and Box Furnaces
Vacuum flange fittings and assembly

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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.