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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

Transported by LTL Freight (Truck)

Product Options

UL/MET/CE Certifications:
Processing tube size:


Upgrade to Eurotherm Temp Programmer (three zone) Upgrade + 15" Laptop + USB-to-RS485 Cable

OTF-1200X-III-UL series furnaces are configurated to meet UL/CSA 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 a 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.

Furnace Structure
  • Double layer steel case with two cooling fans, which ensure low surface temperature;
  • Energy saving high purity fibrous alumina insulation;
  • 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
  • Split cover with interlock protection
  • Quartz block (Optional) is ideal for more cleanness and higher achievable vacuum.

               click here to choose a crucible

Quartz Tube Size
OTF-1200X-4-III-UL OTF-1200X-5-III-UL
80ODx 72IDx 1400L mm (3.14"D x 55" )
Heating Zone Length
3 zones: 900mm (36") in total  
300mm  (11.8") for each zone
Temperature profile 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)
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
  • 1000°C under vacuum
  • 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 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 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.
European Temperature Controllers (optional upgrade)
  • 1 heating channel
  • 1 programs of 8 or 24 segment
  • Alarm Relay: Form 'A' and Form ‘C’ built-in 
  • Digital Communications: RS485
  • Temperature Accuracy:  ±  0.1ºC
  • Recipes: Using a PC tool recipes can be created that can be used to change the operating parameters of the 3000 simply by selecting a new recipe via the HMI. This is very useful where multiple products are processed using the same controller but require different parameters to be set.
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 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, and click picture below to order a vacuum pump separately
  • You may order flange support to avoid tube rotating ( click Pic below right )

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.)
Laptop, software & WiFi Control(Optional)
  • Brand new laptop with Microsoft Window 10 and Microsoft Office 2013 (30 days free trial) for immediate use.
  • Labview Based Temperature Control System (EQ-MTS01) enables user to edit temperature profile, manage heat-treatment recipe, record and plot data for MTI furnaces.
  • A wireless remote control provides up to 300 meters operating range.
  • Above features are available upon request at an extra cost (up to $1,000). Please contact us for more information.
  • Note: 
    The software is only compatible with MTI’s Yudian Temperature Controller


  • 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 &
Demo Video

   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 flanges 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) 
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.