1200C 1-Zone Top-Open Tube Furnace w/ Kanthal Element


Ai STF1200 series top-open tube furnaces feature the famous Kanthal (Sweden) spiral wire coils embedded in Mitsubishi (Japan) high quality grade 1500 alumina fiber insulation. A double walled steel internal housing helps minimize heat loss to exterior surface.

Furnace operation is controlled by Shimaden (Japan) 40-segment digital controller with built-in RS485 digital communications port and USB adaptor, allowing the user to connect to a PC for remote control and monitoring of the furnace. You can also save or export test results.

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SKU: STF1200 Categories: ,



  • Compact, portable and lightweight design.
  • Top-open furnace chamber for fast and easy tube access.
  • Standard package includes set of stainless steel vacuum sealing flanges with valves and pressure meter.
  • Microprocessor based self-tuning PID control provides optimum thermal process with minimal overshoot.
  • Multiple atmosphere processes in a single cycle are possible (ex: binder burn out in air and parts sintering under rough vacuum or inert gas environment.)
  • Built-in ammeter and dual voltmeters for easy monitoring and troubleshooting.
  • Built-in computer interface.
  • Long life type K thermocouple.
  • ETL and CE certified, standard


  • Overheat protection shuts down the furnace if temperature is outside of acceptable range (refer to controller’s manual) or when the thermocouple is broken or malfunctions.
  • Power failure protection resumes furnace operation right after the point of failure when power is reestablished.

Warning! NEVER fill furnace with explosive gases, including Hydrogen, Carbon Monoxide and Methane.

General specifications


Electrical requirements208-240VAC, 50/60 Hz, single phase
Tube materialQuartz
Maximum working temperature1200°C (2 hours maximum continuous run time)
Maximum constant working temperature1100°C
Constant working temperature under vacuum1000°C
Minimum working temperatureAmbient
Rated vacuum pressure0.001 Pa / 0.0075 millitorr / 0.00001 mbar
Rated positive pressure0.02 MPa / 150 torr / 3 psi
Heating element type
Kanthal (Sweden) A1 2.0 resistance coil wire
Thermocouple typeK
Refractory liningMitsubishi (Japan) high quality 1500 grade fiber alumina
Temperature controllerShimaden (Japan) fp93 (made in Japan) with 4 patterns and
40 segments (ie. 4 x 10 segments or 2 x 20 segments).
Maximum heating rate < 30°C / min
Heating zone length16 inches
Constant temperature zone length 10 inches
Temperature controller precision
± 1°C
Vacuum sealing flange kit Stainless steel vacuum sealing flanges with one vacuum gauge,
two valves and four thermal ceramic blocks.
Gas inlet/outlet1/4″ hose barb with 1/4″ BSPT (British Standard Pipe Thread)
ETL tested to UL and CSA standards, CE
Product brochure

Size comparison


Tube size (OD x length)60mm x 1m100mm x 1m150mm x 1m200mm x 1m250mm x 1m
Maximum output2.5 kW3.5 kW5 kW6 kW8 kW
Furnace assembled (LxWxH)49x18x27″49x18x27″49x19x28″49x20x29″49x20x29″
Shipping dimensions (LxWxH)46x21x36″46x21x36″46x22x37″50x28x40″50x28x40″
Shipping weight (Lb)270350470520670




How to Program Across International furnaces


How to Install an Across International Tube Sealing Flange


Standard Package



Part description






Part image


STF1200 top-open tube furnace1 pc
Quartz tube 1000mm length
60-100mm OD: 2 pcs, 150mm/250mm OD: 1 pc
1-2 pcs
Stainless steel vacuum sealing flanges w/ pressure gauge1 set
Analog flow meter1 pc
Stainless steel hook1 pc
Alumina thermal block (for 120mm OD and down)
Quartz thermal block (for 150mm OD and up)
to protect flanges sealing gaskets from heat damage
2 pairs
Alumina crucible5 pcs
Thermal gloves1 pair
Spare fuse2 pcs
USB/RS485 computer interface kit1 set
L6-30P 250 volt twist-lock plug
(No plug installed for 250mm OD, only power cable)
Furnace and Shimaden controller manual2 pcs

Additional information

Weight47 lbs
Dimensions46 × 22 × 37 cm
Tube size

OD 60mm L 1000mm open both ends, OD 100mm L 1000mm open both ends (+$900.00), OD 150mm L 1000mm open both ends (+$3,500.00), OD 200mm L 1000mm open both ends (+$5,500.00), OD 250mm L 1200mm open both ends (+$7,500.00)

Vacuum setup

3/8" hose barb with no pump (no extra charge), KF25 flange port with no pump (no extra charge), Ai 110/220V EasyVac 9 cfm 2-Stage pump w/ filter (+$790.00), Ai 110/220V SuperVac 5.6 cfm 0.3 micron pump (+$1,600.00), Ai 110V SuperVac 11cfm 0.3 micron pump (+$2,300.00), Edwards 110/220V 6.9 cfm RV8 pump (+$2,690.00), Edwards 110/220V 21 cfm E2M28 pump (+$4,863.00), Edwards 110/220V 7.5 cfm nXDS10iC pump (+$6,667.00)


No additional accessories (no extra charge), 2 quarts (1.9 L) of ultra grade 19 pump oil (+$34.00), EZ-Swap vacuum pump exhaust filter w/ fittings (+$159.00)


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