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L 3/12 L 5/11  

LT 5/12

Over-temperature limiter

Muffle furnace L 5/11 with gas supply system

Adjustable air inlet integrated in the door

L 1/12 - LT 40/12

The muffle furnaces L 1/12 - LT 40/12 are the right choice 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.

  • 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 40/12)
  • Ceramic heating plates with integral heating element which is safeguarded against fumes and splashing, and easy to replace
  • Insulation made of non-classified fiber material
  • Housing made of sheets of textured stainless steel
  • Dual shell housing for low external temperatures and high stability
  • Optional flap door (L) which can be used as work platform or lift door (LT) with hot surface facing away from the operator
  • Adjustable air inlet integrated in door (see illustration)
  • Exhaust air outlet in rear wall of furnace
  • Solid state relays provide for low-noise operation
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Chimney, chimney with fan or catalytic converter (not for L 1)
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Protective gas connection to purge with non-flammable protective or reaction gases
  • Manual or automatic gas supply system
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes
Flap door°Cwdhin lWDHload kWconnection*in kgto Tmax2
L 3/11 1100 160 140 100 3 380 370 420 1.2 1-phase 20 60
L 5/11 1100 200 170 130 5 440 470 520 2.4 1-phase 35 60
L 9/11 1100 230 240 170 9 480 550 570 3.0 1-phase 45 75
L 15/11 1100 230 340 170 15 480 650 570 3.5 1-phase 55 90
L 24/11 1100 280 340 250 24 560 660 650 4.5 3-phase 75 95
L 40/11 1100 320 490 250 40 600 790 650 6.0 3-phase 95 95
                         
L 1/12 1200 90 115 110 1 250 265 340 1.5 1-phase 10 25
L 3/12 1200 160 140 100 3 380 370 420 1.2 1-phase 20 75
L 5/12 1200 200 170 130 5 440 470 520 2.4 1-phase 35 75
L 9/12 1200 230 240 170 9 480 550 570 3.0 1-phase 45 90
L 15/12 1200 230 340 170 15 480 650 570 3.5 1-phase 55 105
L 24/12 1200 280 340 250 24 560 660 650 4.5 3-phase 75 110
L 40/12 1200 320 490 250 40 600 790 650 6.0 3-phase 95 110
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes
Lift door°Cwdhin lWDH1load kWconnection*in kgto Tmax2
LT 3/11 1100 160 140 100 3 380 370 420+165 1.2 1-phase 20 60
LT 5/11 1100 200 170 130 5 440 470 520+220 2.4 1-phase 35 60
LT 9/11 1100 230 240 170 9 480 550 570+290 3.0 1-phase 45 75
LT 15/11 1100 230 340 170 15 480 650 570+290 3.5 1-phase 55 90
LT 24/11 1100 280 340 250 24 560 660 650+335 4.5 3-phase 75 95
LT 40/11 1100 320 490 250 40 600 790 650+335 6.0 3-phase 95 95
                         
LT 3/12 1200 160 140 100 3 380 370 420+165 1.2 1-phase 20 75
LT 5/12 1200 200 170 130 5 440 470 520+220 2.4 1-phase 35 75
LT 9/12 1200 230 240 170 9 480 550 570+290 3.0 1-phase 45 90
LT 15/12 1200 230 340 170 15 480 650 570+290 3.5 1-phase 55 105
LT 24/12 1200 280 340 250 24 560 660 650+335 4.5 3-phase 75 110
LT 40/12 1200 320 490 250 40 600 790 650+335 6.0 3-phase 95 110
1Including opened lift door *Please see page 60 for more information about supply voltage
2If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE
 

Muffle Furnaces Basic Models

 
LE 1/11 LE 6/11  

Over-temperature limiter

LE 1/11 - LE 14/11

With their unbeatable price/performance ratio, these compact muffle furnaces are perfect for many applications in the laboratory. Quality features like the dual shell furnace housing of rust-free stainless steel, their compact, lightweight constructions, or the heating elements encased in quartz glass tubes make these models reliable partners for your application.

  • Tmax 1100 °C, working temperature 1050 °C
  • Heating from two sides from heating elements in quartz glass tubes
  • Maintenance-friendly replacement of heating elements and insulation
  • Insulation made of non-classified fiber material
  • Housing made of sheets of textured stainless steel
  • Dual shell housing for low external temperatures and high stability
  • Flap door which can also be used as a work platform
  • Exhaust air outlet in rear wall
  • Solid state relays provide for low-noise operation
  • Compact dimensions and light weight
  • Controller mounted under the door to save space
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Chimney, chimney with fan or catalytic converter (not for L 1)
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Protective gas connection to purge with non-flammable protective or reaction gases
  • Manual gas supply system
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes 
 °Cwdhin lWDHload kWconnection*in kgto Tmax1
LE 1/11 1100 90 115 110 1 250 265 340 1.5 1-phase 10 10
LE 2/11 1100 110 180 110 2 275 380 350 1.8 1-phase 10 25
LE 6/11 1100 170 200 170 6 510 400 320 1.8 1-phase 18 35
LE 14/11 1100 220 300 220 14 555 500 370 2.9 1-phase 25 40
1If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE *Please see page 60 for more information about supply voltage
 

Muffle Furnaces with Brick Insulation and Flap Door or Lift Door

 
LT 5/13 L 9/13  

Furnace lining with high-quality lightweight refractory brick insulation 

Over-temperature limiter

L 5/13 - LT 15/13

Heating elements on support tubes radiating freely into the furnace chamber provide for particularly short heating times for these muffle furnaces. Thanks to their robust lightweight refractory brick insulation, they can reach a maximum working temperature of 1300 °C. These muffle furnaces thus represent an interesting alternative to the familiar L(T) 3/11 models, when you need particularly short heating times or a higher application temperature.

  • Tmax 1300 °C
  • Heating from two sides
  • Heating elements on support tubes ensure free heat radiation and a long service life
  • Multi-layer insulation with robust lightweight refractory bricks in the furnace chamber
  • Housing made of sheets of textured stainless steel
  • Dual shell housing for low external temperatures and stability
  • Optional flap door (L) which can be used as work platform or lift door (LT) with hot surface facing away from the operator
  • Adjustable air inlet in the furnace door
  • Exhaust air outlet in rear wall of furnace
  • Solid state relays provide for low-noise operation
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Chimney, chimney with fan or catalytic converter
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Protective gas connection to purge with non-flammable protective or reaction gases
  • Manual or automatic gas supply system
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes 
 °Cwdhin lWDHload kWconnection*in kgto Tmax2
L, LT 5/13 1300 200 170 130 5 440 470 520+2201 2.4 1-phase 42 45
L, LT 9/13 1300 230 240 170 9 480 550 570+2901 3.0 1-phase 60 50
L, LT 15/13 1300 230 340 170 15 480 650 570+2901 3.5 1-phase 70 60
1Including opened lift door (LT models) *Please see page 60 for more information about supply voltage
2If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE
 

Ashing Furnaces with Flap Door or Lift Door

 
LV 3/11 LVT 9/11  

Air intake and exhaust flow principle

Over-temperature limiter

LV 3/11 - LVT 15/11

The ashing furnaces LV 3/11 - LVT 15/11 are especially designed for ashing in the laboratory. A special air intake and exhaust system allows air exchange of more than 6 times per minute. Incoming air is preheated to ensure a good temperature uniformity.

  • Tmax 1100 °C
  • Heating from two sides
  • Ceramic heating plates with integral heating element which is safeguarded against fumes and splashing, and easy to replace
  • Air exchange of more than 6 times per minute
  • Good temperature uniformity due to preheating of incoming air
  • Insulation made of non-classified fiber material
  • Housing made of sheets of textured stainless steel
  • Dual shell housing for low external temperatures and stability
  • Optional flap door (L) which can be used as work platform or lift door (LT) with hot surface facing away from the operator
  • Solid state relays provide for low­noise operation
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes 
Flap door°Cwdhin lWDH1load kWconnection*in kgto Tmax2
LV 3/11 1100 160 140 100 3 380 370 750 1.2 1-phase 20 120
LV 5/11 1100 200 170 130 5 440 470 850 2.4 1-phase 35 120
LV 9/11 1100 230 240 170 9 480 550 900 3.0 1-phase 45 120
LV 15/11 1100 230 340 170 15 480 650 900 3.5 1-phase 55 120
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes 
Lift door°Cwdhin lWDH1load kWconnection*in kgto Tmax2
LVT 3/11 1100 160 140 100 3 380 370 750 1.2 1-phase 20 120
LVT 5/11 1100 200 170 130 5 440 470 850 2.4 1-phase 35 120
LVT 9/11 1100 230 240 170 9 480 550 900 3.0 1-phase 45 120
LVT15/11 1100 230 340 170 15 480 650 900 3.5 1-phase 55 120
1Including exhaust tube (Ø 80 mm) *Please see page 60 for more information about supply voltage
2If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE
 

Muffle Furnaces with Embedded Heating Elements in the Ceramic Muffle

 
L 9/11/SKM  

Muffle heated from four sides

Gas supply system for non-flammable protective or reactive gas with shutoff valve and flow meter with regulator valve, piped and ready to connect

Over-temperature limiter

L, LT 9/11/SKM

We particularly recommend the muffle furnace L 9/11/SKM if your application involves aggressive substances. The furnace has a ceramic muffle with embedded heating from four sides. The muffle furnace thus combines a very good temperature uniformity with excellent protection of the heating elements from aggressive atmospheres. Another aspect is the smooth, nearly particle free muffle (furnace door made of fiber insulation), an important quality feature for some ashing processes.

  • Tmax 1100 °C
  • Muffle heated from four sides
  • Furnace chamber with embedded ceramic muffle, high resistance to aggressive gasses and vapours
  • Housing made of sheets of textured stainless steel
  • Optional flap door (L) which can be used as work platform or lift door (LT) with hot surface facing away from the operator
  • Adjustable working air inlet in the door
  • Exhaust air outlet in rear wall of furnace
  • Solid state relays provide for low­noise operation
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Chimney, chimney with fan or catalytic converter
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Protective gas connection to purge with non-flammable protective or reaction gases
  • Manual or automation gas supply system
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes
 °Cwdhin lWDHload kWconnection*in kgto Tmax2
L 9/11/SKM 1100 230 240 170 9 480 550 570 3.0 1-phase 50 90
LT 9/11/SKM 1100 230 240 170 9 480 550 570+2901 3.0 1-phase 50 90
1Including opened lift door *Please see page 60 for more information about supply voltage
2If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE
 

Weighing Furnace incl. Scale and Software for Determination of Combustion Loss

 
L 9/11/SW  

4 scales available for different maximum weights and scaling areas

Over-temperature limiter

Software for documentation of the temperature curve and combustion loss using a PC

L 9/11/SW - LT 9/12/SW

This weighing furnace with integrated precision scale and software, was designed especially for combustion loss determination in the laboratory. The determination of combustion loss is necessary, for instance, when analyzing sludges and household garbage, and is also used in a variety of technical processes for the evaluation of results. The difference between the initial total mass and the combustion residue is the combustion loss. During the process, the software included records both the temperature and the weight loss.

  • Tmax 1100 °C or 1200 °C
  • Heating from two sides
  • Ceramic heating plates with integral heating element which is safeguarded against fumes and splashing, and easy to replace
  • Insulation made of non-classified fiber material
  • Housing made of sheets of textured stainless steel
  • Optional flap door (L) which can be used as work platform or lift door (LT) with hot surface facing away from the operator
  • Adjustable working air inlet in the door
  • Exhaust air outlet in rear wall of furnace
  • Solid state relays provide for low­noise operation
  • Delivery includes base, ceramic plunger with base plate in the furnace lining, precision scale and software package
  • 4 scales available for different maximum weights and scaling ranges
  • Software for documentation of the temperature curve and combustion loss using a PC
  • Defined application within the constraints of the operating instructions

Additional equipment

  • Chimney, chimney with fan or catalytic converter
  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes
flap door°Cwdhin lWDHload kWconnection*in kgto Tmax2
L 9/11/SW 1100 230 240 170 9 480 550 800 3.0 1-phase 55 75
L 9/12/SW 1200 230 240 170 9 480 550 800 3.0 1-phase 55 90
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmConnectedElectricalWeightMinutes 
Lift door°Cwdhin lWDH1load kWconnection*in kgto Tmax2
LT 9/11/SW 1100 230 240 170 9 480 550 800+290 3.0 1-phase 55 75
LT 9/12/SW 1200 230 240 170 9 480 550 800+290 3.0 1-phase 55 90
1Including opened lift door *Please see page 60 for more information about supply voltage
2If connected at 230 V 1/N/PE rsp. 400 V 3/N/PE
ScaleReadabilityWeight rangeWeight of plungerCalibration valueMinimum load
typein gin gin gin gin g
EW-2200 0,01 2200 incl. plunger 850 0,1 0,5
EW-4200 0,01 4200 incl. plunger 850 0,1 0,5
EW-6200 0,01 6200 incl. plunger 850 - 1,0
EW-12000 0,10 12000 incl. plunger 850 1,0 5,0
 

Exhaust Systems/Accessories

   
   
 

* Note: If other controller types are used an adapter cable for connection to mains supply has to be ordered separately. The device will be activated by plugging in the socket.

   
Chimney for connection to an exhaust pipe. Chimney with fan, to remove exhaust gas from the furnace better. The B 400 - P 480 controllers can be used to activate the fan automatically (not for models L(T) 15.., L 1/12, LE 1/11, LE 2/11).* Catalytic converter with fan for removal of organic components from the exhaust air. Organic components are catalytically oxidized at about 600 °C, broken into carbon dioxide and water vapour. Irritating odors are thus largely eliminated. The B 400 - P 480 controllers can be used to switch the catalytic converter automatically (not for models L(T) 15.., L 1/12, LE 1/11, LE 2/11).*
Exhaust torch to burn exhaust gases which are generated during the process. The torch is gas-fired and will be operated with propane gas. If a catalytic afterburner cannot be used for the process this torch is recommended. Square saggar for furnaces HTC and LHT, Tmax 1600 °C The load is placed in ceramic saggars for optimal utilization of the furnace space. Up to three saggars can be stacked on top of each other in the furnace. Each saggar has cut-outs for better ventilation. The top saggar should be closed with a lid made of ceramics also. Round saggar (Ø 115 mm) for furnaces LHT/LB, Tmax 1650 °C These saggars are perfectly suited for furnaces LHT/LB. The load is placed in the saggars. Up to three saggars can be stacked on top of each other in order to use the overall furnace chamber.
                 
 

 

   
   
 

Select between different bottom plates and collecting pans for protection of the furnace and easy loading (for models L, LT, LE, LV and LVT 

   
Ceramic ribbed plate, Tmax 1200 °C Ceramic collecting pan, Tmax 1300 °C Steel collecting pan, Tmax 1100 °C
                 
For modelsCeramic ribbed plateCeramic collecting panSteel collecting pan (Material 1.4828)
 Articel No.Dimensions in mmArticel No.Dimensions in mmArticel No.Dimensions in mm
L 1, LE 1 691601835 110 x 90 x 12.7 - - 691404623 85 x 100 x 20
LE 2 691601097 170 x 110 x 12.7 691601099 100 x 160 x 10 691402096 110 x 170 x 20
L 3, LT 3, LV 3, LVT 3 691600507 150 x 140 x 12.7 691600510 150 x 140 x 20 691400145 150 x 140 x 20
LE 6, L 5, LT 5, LV 5, LVT 5 691600508 190 x 170 x 12.7 691600511 190 x 170 x 20 691400146 190 x 170 x 20
L 9, LT 9, LV 9, LVT 9, N 7 691600509 240 x 220 x 12.7 691600512 240 x 220 x 20 691400147 240 x 220 x 20
LE 14 691601098 210 x 290 x 12.7 - - 691402097 210 x 290 x 20
L 15, LT 15, LV 15, LVT 15, N 11 691600506 340 x 220 x 12.7 - - 691400149 230 x 330 x 20
L 24, LT 24 691600874 340 x 270 x 12.7 - - 691400626 270 x 340 x 20
L 40, LT 40 691600875 490 x 310 x 12.7 - - 691400627 310 x 490 x 20
 

 

   
   
 

Heat-resistant gloves for protection of the operator when loading or removing hot materials, resistant to 650 °C or 700 °C.

   
Gloves, Tmax 650 °C. Gloves, Tmax 700 °C. Various tongs for easy loading and unloading of the furnace.
                 

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