Muffle Furnaces with Brick Insulation up to 1300 °C

Thanks to their robust lightweight refractory brick insulation, they can reach a maximum working temperature of 1300 °C.

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Process Control

Function and equipment

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

Catalog download
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- Italiano
- Polski
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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
Dual shell ventilated housing made of textured stainless steel sheets for low surface temperature 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 in the furnace door
Exhaust air outlet in rear wall of furnace
Controller with touch operation B510 (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
Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and load
Protective gas connection to purge with non-flammable process 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

Technical specifications

Model	Tmax	Inner dimensions in mm			Volume	Outer dimensions² in mm			Temperature uniformity of +/− 5K in the empty workspace⁵			Max. 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, LT 5/13	1300	225	170	130	5	490	450	580+320	170	100	80	2.6	1-phase	46	55
L, LT 9/13	1300	250	240	170	9	530	525	630+350	180	170	120	3.3	1-phase	58	60
L, LT 15/13	1300	250	340	170	15	530	625	630+350	180	270	120	3.5	1-phase	71	80
¹Recommended working temperature for processes with longer dwell times is 1200 °C 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) 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