Laboratory /
Muffle Furnaces up to 1400 °C

Muffle Furnaces up to 1100 °C or 1200 °C

Muffle furnace LT 5/12 with lift door Muffle furnace L 3/11 with flap door

Muffle furnace L 3/12

Muffle furnace L 3/11 with flap door

Chimney with fan

Adjustable air inlet integrated in the door

Gas supply system for non-flammable protective or reactive gas

The muffle furnaces L 1/12 - LT 40/12 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 40/12) 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
  • Adjustable air inlet integrated in door (see illustration)
  • Exhaust air outlet in rear wall of furnace
  • Controller B410 resp. R7 for L 1/12 (5 programs with each 4 segments)

Additional Equipment

  • Chimney, chimney with fan or catalytic converter (not for L 1 and L 15)
  • 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 (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
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmTemperature uniformity of +/− 5K in the empty workspaceConnected loadElectricalWeightHeating time
 in °C1wdhin lWDH3wdhin kWconnection*in kgin min4
L(T) 3/1111001601401003385330405+15511050501.21-phase2040
L(T) 5/1111002001701305385390460+20515080802.41-phase3050
L(T) 9/1111002302401709415455515+2401801501203.01-phase3565
L(T) 15/11110023034017015415555515+2401802501203.51-phase4075
L(T) 24/11110028034025024490555580+3202302502004.53-phase5570
L(T) 40/11110032049025040530705580+3202704002006.03-phase6575
                
L 1/1212009011511012902804304045601.51-phase1025
L(T) 3/1212001601401003385330405+15511050501.21-phase2045
L(T) 5/1212002001701305385390460+20515080902.41-phase3060
L(T) 9/1212002302401709415455515+2401801501203.01-phase3575
L(T) 15/12120023034017015415555515+2401802501203.51-phase4085
L(T) 24/12120028034025024490555580+3202302502004.53-phase5580
L(T) 40/12120032049025040530705580+3202704002006.03-phase6585
1Recommended working temperature for processes with longer dwell times is 1000 °C (L../11) rsp. 1100 °C (L../12)*Please see page 75 for more information about supply voltage
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)
 

Economy Muffle Furnaces up to 1100 °C

Muffle furnace LE 6/11 Muffle furnace LE 1/11

Muffle furnace LE 14/11

Heating elements protected in quartz glass tubes

With their convincing price/performance ratio and the fast heat-up rates, 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.

Standard Equipment

  • Tmax 1100 °C
  • Heating from two sides from heating elements protected in quartz glass tubes
  • Fast heating times (see table)
  • Maintenance-friendly replacement of heating elements and insulation
  • Housing powder-coated in industrial qualtiy
  • Flap door which can also be used as a work platform
  • Exhaust air outlet in rear wall
  • Compact dimensions and light weight
  • Controller mounted under the door to save space
  • Controller R7

Additional Equipment

  • Chimney, chimney with fan or catalytic converter (not for LE 1)
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmTemperature uniformity of +/− 5K in the empty workspaceConnectedElectricalWeightHeating time
 in °C1wdhin lWDHwdhload in kWconnection*in kgin min3
LE 1/1111009011511012902804104045601.51-phase1010
LE 2/111100110180110233039041060110601.81-phase1025
LE 6/11110017020017063904404701201301201.81-phase1830
LE 14/111100220300220144405405201702301702.91-phase2535
1Recommended working temperature for processes with longer dwell times is 1050 °C*Please see page 75 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE)
 

Muffle Furnaces with Brick Insulation up to 1300 °C

Muffle furnace L 9/13 with flap door Muffle furnace LT 5/13 with lift door

Furnace lining with high-quality lightweight refractory brick insulation

Example of an over-temperature limiter

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) ../12 models, when you need a higher application temperature.

Standard Equipment

  • 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
  • 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
  • Controller B410 (5 programs with each 4 segments)

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 (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
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmTemperature uniformity of +/− 5K in the empty workspaceConnected loadElectricalWeightHeating time
 in °C1wdhin lWDH3wdhin kWconnection*in kgin min4
L, LT 5/1313002001701305490450580+320150150802.41-phase4260
L, LT 9/1313002302401709530525630+3501802201203.01-phase6060
L, LT 15/13130023034017015530625630+3501803201203.51-phase7070
1Recommended working temperature for processes with longer dwell times is 1200 °C*Please see page 75 for more information about supply voltage
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)
 

Muffle Furnaces up to 1400 °C

Muffle furnace LT 9/14 with lift door Muffle furnace L 9/14 with flap door

Chimney with fan

Example of an over-temperature limiter

These models stand out for their excellent workmanship, advanced and attractive design, and high level of reliability. Heating elements on support tubes radiating freely into the furnace chamber provide for particularly short heating times and a maximum temperature of 1400 °C. These muffle furnaces are a good alternative to the familiar L(T) ../12 series when higher application temperatures are needed.

Standard Equipment

  • Tmax 1400 °C
  • Heating from two sides
  • Heating elements on support tubes ensure free heat radiation and a long service life
  • Adjustable air inlet integrated in door
  • Exhaust air outlet in rear wall of furnace
  • Controller B410 (5 programs with each 4 segments)

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 (not available in combination with chimney, chimney with fan or catalytic converter), not gas tight
  • Manual or automatic gas supply system
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmTemperature uniformity of +/− 5K in the empty workspaceConnected loadElectricalWeightHeating time
 in °C1wdhin lWDH3wdhin kWconnection*in kgin min4
L, LT 5/1414002001701305490450580+320150170802.61-phase4250
L, LT 9/1414002502501709530525630+3502002501203.51-phase5550
L, LT 15/14140025035017015530625630+3502003501203.51-phase6370
1Recommended working temperature for processes with longer dwell times is 1300 °C*Please see page 75 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Including opened lift door
4Heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE)
 

Muffle Furnaces with Embedded Heating Elements in the Ceramic Muffle up to 1100 °C

Muffle furnace L 9/11/SKM with flap door Muffle furnace L 9/11/SKM

Gas supply system for non-flammable protective or reactive gas

Muffle heated from four sides

We particularly recommend the muffle furnace L 9/11/SKM for heat treatment of 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.

Standard Equipment

  • Tmax 1100 °C
  • Muffle heated from four sides
  • Furnace chamber with embedded ceramic muffle, high resistance to aggressive gasses and vapours
  • 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
  • Controller B410 (5 programs with each 4 segments)

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 (not available in combination with chimney, chimney with fan or catalytic converter) not gas tight
  • Manual or automation gas supply system
  • Port for thermocouple in the rear wall or in the furnace door
ModellTmaxInner dimensions in mmVolumeOuter dimensions2 in mmConnectedElectricalWeightHeating time
 in °C1wdhin lWDHload in kWconnection*in kgin min4
L 9/11/SKM110023024017094905055803.41-phase5075
LT 9/11/SKM11002302401709490505580+32033.41-phase5075
1Recommended working temperature for processes with longer dwell times is 1000 °C*Please see page 75 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Including opened lift door
4Heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE)
 

Ashing Furnaces up to 1100 °C

Ashing furnace LV 3/11 Ashing furnace LVT 5/11

Air inlet and exhaust flow principle in ashing furnaces

Ceramic collecting pan

Ashing furnace LV 5/11 with port for thermocouple in the rear wall of furnace

Charging trolley to load the furnace in different levels

Ashing furnace LV ../11 is designed especially for ashing processes to 1050 °C in the laboratory. Applications include determining loss on ignition, ashing food and plastics for subsequent substance analysis. A special fresh-air and exhaust air system ensures that the air is replaced 6 times per minute so that there is always sufficient oxygen for the ashing process. Incoming air passes the furnace heating and is pre-heated to ensure good temperature uniformity.

Standard Equipment

  • Tmax 1100 °C
  • Heating from two sides
  • Ceramic heating plates with integral heating element which is safeguarded, and easy to replace
  • Air exchange of more than 6 times per minute
  • Good temperature uniformity due to preheating of incoming air, temperature uniformity according to DIN 17052-1 to +/− 10 °C in the defined empty work area (from 550  °C)
  • Suitable for many standardized ashing processes according to ISO, ASTM, EN, and DIN
  • Optional flap door (LV) which can be used as work platform or lift door (LVT) with hot surface facing away from the operator
  • Controller B410 (5 programs with each 4 segments)

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
  • Port for thermocouple in the rear wall or in the furnace door
  • Charging trolley with solid or perforated trays to load the furnace in different levels, including holders to insert/remove the trays
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmMax. weight of hydrocarbonsMax. evaporation rateConnected
loadElectricalWeightHeating time
Flap doorin °C1wdhin lWDH3in gg/minin kWconnection*in kgin min4
LV 3/111100160140100338536073550.11.21-phase2045
LV 5/1111002001701305385420790100.22.41-phase3555
LV 9/1111002302401709415485845150.33.01-phase4570
LV 15/11110023034017015415585845250.33.51-phase5580
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmMax. weight of hydrocarbonsMax. evaporation rateConnected loadElectricalWeightHeating time
Lift doorin °C1wdhin lWDH3in gg/minin kWconnection*in kgin min4
LVT 3/111100160140100338536073550.11.21-phase2045
LVT 5/1111002001701305385420790100.22.41-phase3555
LVT 9/1111002302401709415485845150.33.01-phase4570
LVT 15/11110023034017015415585845250.33.51-phase5580
1Recommended working temperature for processes with longer dwell times is 1000 °C*Please see page 75 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Including exhaust tube (Ø 80 mm)
4Approx. heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE)
 

Ashing Furnaces with Integrated Exhaust Gas Cleaning up to 1100 °C

Ashing furnace L 40/11 BO Ashing furnace L 9/11 BO

Schematic presentation of air circulation in ashing furnace L 24/11 BO

Steel collecting pan protects the bottom insulation

The ashing furnace L ../11 BO is specially designed for processes in which larger sample quantities have to be incinerated. Fields of application are e.g. the ashing of food, thermal cleaning of injection molding tools or the determination of annealing loss. Another application is the debinding of ceramic products, e.g. after additive production.

The ashing furnaces have a passive safety system and integrated exhaust gas post combustion. An exhaust gas fan extracts flue gases from the furnace and simultaneously supplies fresh air to the furnace atmosphere with the result that sufficient oxygen is always available for the incineration process. The incoming air is guided behind the furnace heating and preheated to ensure good temperature uniformity. Exhaust gases are led from the furnace chamber to the integrated post combustion system, where they are postburned and catalytically cleaned. Directly after the incineration process (up to max. 600 °C) a subsequent process up to max. 1100 °C can take place.

Standard Equipment

  • Tmax 600 °C for the incineration process
  • Tmax 1100 °C for the subsequent process
  • Three-side heating (both sides and bottom)
  • Ceramic heating plates with embedded heating wire
  • Steel collecting pan protects the bottom insulation
  • Spring-assisted closing of the furnace door (flap door) with mechanical locking against unintentional opening
  • Thermal/catalytic post combustion, integrated in the exhaust channel, up to 600  °C in function
  • Temperature control of post combustion can be set up to 850 °C
  • Monitored exhaust air
  • Inlet-air preheated through the bottom heating plate
  • 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
  • Controller C450 (10 programs with each 20 segments)
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmMax. weight of hydrocarbonsMax. evaporation rateConnected loadElectricalWeight
 in °C1wdhin lWDH3in gg/minin kWconnection*in kg
L 9/11 BO11002302401709415575750751.07.03-phase60
L 24/11 BO1100280340250244906758001502.09.03-phase90
L 40/11 BO1100320490250405308258002002.111.53-phase110
1Recommended working temperature for processes with longer dwell times is 1000 °C*Please see page 75 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Including exhaust tube (Ø 80 mm)
 

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

Weighing furnace L 9/11/SW with flap door

4 scales available for different maximum weights and scaling ranges

Example of an over-temperature limiter

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

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 other processes for the evaluation of results. The difference between the charged total mass and the combustion residue is the combustion loss. During the process, the software included records both the temperature and the weight loss.

Standard Equipment

  • Like muffle furnaces L(T), except:
  • 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
  • Process control and documentation for temperature and combustion loss via VCD software package for monitoring, documentation and control
  • Controller B410 (5 programs with each 4 segments)

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
  • Port for thermocouple in the rear wall or in the furnace door
ModelTmaxInner dimensions in mmVolumeOuter dimensions2 in mmConnectedElectricalWeightHeating time
 in °C1wdhin lWDHload in kWconnection*in kgin min4
L(T) 9/11/SW11002302401709415455740+24033.01-phase5065
L(T) 9/12/SW12002302401709415455740+24033.01-phase5075
1Recommended working temperature for processes with longer dwell times is 1000 °C (L 9/11) rsp. 1100 °C (L 9/12)*Please see page 75 for more information about supply voltage
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Including opened lift door (Model LT ..)
4Heating time of the empty and closed furnace up to Tmax −100 K (connected to 230 V 1/N/PE)
ScaleReadabilityMaximum weighing rangeWeight of plungerCalibration valueMinimum load
typein gin gin gin gin g
EW-22000.012200 incl. plunger8500.10.5
EW-42000.014200 incl. plunger8500.10.5
EW-62000.016200 incl. plunger850-1.0
EW-120000.1012000 incl. plunger8501.05.0
 

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.

 
Exhaust Vent Exhaust vent for collection and upstream direction of escaping gases Chimney with Fan Exhaust gases are better removed from the furnace and discharged. The B400 - P480 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 Organic components are catalytically cleaned at about 600 °C, broken into carbon dioxide and water vapour. Irritating odors are thus largely eliminated. The B400 - P480 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).*
Square Saggar for Furnaces LHTC 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. In models LHT 01/17 D and LHTCT 01/16 up to two saggars can be stacked. Each saggar has cut-outs for better ventilation. The top saggar should be closed with a lid made of ceramic. 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.  
 

Various ways of removing the exhaust air

Exhaust Air Extraction

When exhaust gases are generated during the process it is mandatory to guide them outside in an adequate way. The relevant operating instructions must be always taken into consideration. When exhaust gas pipings are installed it is always necessary that a local ventilation technician lays out the system in accordance to the real environment.

There are different possibilities to guide the exhaust gases out. In many cases the furnace is positioned under a laboratory extraction provided by the customer. In these cases the use of an exhaust vent is recommended just to guide the gases upwards.

For this purpose metal exhaust gas pipes with NW 80 to NW 120 can be used. They must be installed continuously rising and fastened to the wall or ceiling. Center the pipe over the furnace vent (for models with vent fan or catalytic converter, NW 120 is necessary. The exhaust gas pipe must not be installed with a tight fit to the furnace vent pipe since this would prevent any bypass effect. This is necessary so that not too much fresh air is sucked in by the furnace. An exception are models LV(T) and L ../11 BOs: Here the exhaust gas pipe NW 80 will be connected directly onto the furnace vent pipe.

 

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 Stainless Steel Collecting Pan, Tmax 1100 °C
         
For modelsCeramic ribbed plateCeramic collecting panStainless steel collecting pan (Material 1.4828)
 Articel No.Dimensions in mmArticel No.Dimensions in mmArticel No.Dimensions in mm
L 1, LE 1691601835110 x 90 x 12.7--69140462385 x 100 x 20
LE 2691601097170 x 110 x 12.7691601099100 x 160 x 10691402096110 x 170 x 20
L 3, LT 3, LV 3, LVT 3691600507150 x 140 x 12.7691600510150 x 140 x 20691400145150 x 140 x 20
LE 6, L 5, LT 5, LV 5, LVT 5691600508190 x 170 x 12.7691600511190 x 170 x 20691400146190 x 170 x 20
L 9, LT 9, LV 9, LVT 9, N 7691600509240 x 220 x 12.7691600512240 x 220 x 20691400147240 x 220 x 20
LE 14691601098210 x 290 x 12.7--691402097210 x 290 x 20
L 15, LT 15, LV 15, LVT 15, N 11691600506340 x 220 x 12.7--691400149230 x 330 x 20
L 24, LT 24691600874340 x 270 x 12.7--691400626270 x 340 x 20
L 40, LT 40691600875490 x 310 x 12.7--691400627310 x 490 x 20
 

   
Gloves, Tmax 650 °C For protection of the operator when loading or removing hot materials Gloves, Tmax 700 °C For protection of the operator when loading or removing hot materials Charing Tongs For easy loading and unloading of the furnace