Muffle Furnaces up to 1100 °C or 1200 °C

The muffle furnaces come equipped with either a flap door or lift door at no extra charge.

Process Control

Function and equipment

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Zuluftschieber

The muffle furnaces L 3/11 - LT 60/12 have been proven for daily laboratory use. These models stand out for their excellent workmanship, advanced and attractive design, and high level of reliability. The muffle furnaces come equipped with either a flap door or lift door at no extra charge.

Standard Equipment

  • Tmax 1100 °C or 1200 °C
  • Heating from two sides by ceramic heating plates (heating from three sides for muffle furnaces L 24/11 - LT 60/12) for an optimal temperature uniformity
  • Temperature uniformity of +/− 5 K with closed fresh-air inlet in empty work space according to DIN 17052-1 at working temperatures above 800 °C
  • Thermocouple type N (1100 °C) or type S (1200 °C)
  • Ceramic heating plates with integral heating element which is safeguarded and easy to replace
  • Optional flap door (L) which can be used as work platform or lift door (LT) with hot surface facing away from the operator
  • Dual shell housing made of textured stainless steel sheets with additional fan cooling for low surface temperature
  • Exclusive use of insulation materials without categorization according to EC Regulation No. 1272/2008 (CLP)
  • Adjustable air inlet integrated in door (see illustration)
  • Exhaust air outlet in rear wall of furnace
  • Controller B510 resp. R7 for L 1/12 (5 programs with each 4 segments)
  • Solid state relays provide for lownoise operation
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

Additional Equipment

  • Chimney, chimney with fan or catalytic converter (not for L 1 and L 15)
  • Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and load
  • Protective gas connection to purge with non-flammable protective or reaction gases (not available in combination with chimney, chimney with fan or catalytic converter) not gas tight
  • Manual or automatic gas supply system
  • Port for thermocouple in the rear wall or in the furnace door
  • Process control and documentation via VCD software package for monitoring, documentation and control
  • Charging rack with closed or perforated trays for loading the furnace in two levels incl. holder for inserting/removing the trays up to a max. temperature of 800°C and a max. loading weight per layer of 2 kg for the L(T) 9/11 respectively 3 kg for the L(T) 15/11

Technical specifications

Model Tmax Inner dimensions in mm Volume Outer dimensions2 in mm Temperature uniformity of +/− 5K in the empty workspace5 Connected load Electrical Weight Heating time
  in °C1 w d h in l W D H3 w d h in kW connection in kg in min4
L(T) 3/11 1100 160 140 100 3 385 330 405+155 110 50 50 1.2 1-phase 21 41
L(T) 5/11 1100 205 170 130 5 385 390 460+205 170 80 80 2.4 1-phase 27 47
L(T) 9/11 1100 235 240 170 9 415 455 515+240 180 150 120 3.0 1-phase 35 63
L(T) 15/11 1100 230 340 170 15 415 555 515+240 180 250 120 3.2 1-phase 43 74
L(T) 24/11 1100 280 340 250 24 490 555 580+320 230 250 200 4.5 3-phase 52 69
L(T) 40/11 1100 320 490 250 40 530 705 580+320 270 400 200 6.0 3-phase 70 80
LT 60/11 1100 380 490 330 60 610 705 660+385 290 360 240 9,1 3-phase 83 150
                               
L 1/12 1200 90 115 110 1 290 280 410 40 45 60 1.5 1-phase 15 25
L(T) 3/12 1200 160 140 100 3 385 330 405+155 110 50 50 1.2 1-phase 21 48
L(T) 5/12 1200 205 170 130 5 385 390 460+205 170 80 80 2.4 1-phase 27 59
L(T) 9/12 1200 235 240 170 9 415 455 515+240 180 150 120 3.0 1-phase 35 78
L(T) 15/12 1200 230 340 170 15 415 555 515+240 180 250 120 3.2 1-phase 43 99
L(T) 24/12 1200 280 340 250 24 490 555 580+320 230 250 200 4.5 3-phase 52 82
L(T) 40/12 1200 320 490 250 40 530 705 580+320 270 400 200 6.0 3-phase 70 97
LT 60/12 1200 380 490 330 60 610 705 660+385 290 360 240 9,1 3-phase 83 160
1Recommended working temperature for processes with longer dwell times is 1000 °C (L../11) rsp. 1100 °C (L../12)
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Including opened lift door (LT models)
4Heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE rsp. 400 V 3/N/PE)
5Temperature uniformity of +/− 5 K with closed fresh-air inlet in empty work space according to DIN 17052-1 at working temperatures above 800 °C 

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