HT gas tight retort furnace is equipped with direct or indirect heating depending on temperature. This hot wall retort furnace is perfectly suited for various heat treatment processes requiring a defined protective or a reaction gas atmosphere with a slight overpressure. These compact models can also be laid out for heat treatment under vacuum up to 600 °C. The hot-wall retort furnace chamber consists of a gas tight retort with water cooling around the door to protect the special sealing. With the corresponding safety technology, retort furnaces are also suitable for applications under reaction gases, such as hydrogen or, in combination with the IDB package, for inert debinding or for pyrolysis processes.

Different model versions are available depending on the temperature range:

Models NRA /06 with Tmax 600 °C

Heating elements located inside the retort

Retort made of 1.4571 (X6CrNiMoTi 17-12-2)

Air circulation fan and baffle for directed gas flow

Insulation made of mineral wool

hot-wall retort furnace temperature control with measurement inside the retort

Models NRA/09 with Tmax 900 °C

Design like models NRA/06 with following differences:

Outside heating with heating elements around the retort

Retort made of 1.4828 (X15CrNiSi 20-12)

Multi-layer refractory insulation and micro-porous panel material

Furnace temperature control with measurement outside the retort

Models NR/11 with Tmax 1100 °C

Design like models NRA /09 with following differences:

Retort made of 1.4841 (X15CrNiSi 25-21)

Without gas-circulation and baffles

Welded support brackets

Standard Equipment

Compact design with integrated control and gas supply up to gas tight retort furnace.

Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumina silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.

Swivel door hinged on right side

Open cooling water system

Control divided into several heating zones

Temperature uniformity up to +/− 8 °C according to DIN 17052-1 in the empty work space see page 85

Gas supply system for one non-flammable protective or reaction gas with flow meter and magnetic valve

Defined application within the constraints of the operating instructions

Upgrade for other non-flammable gases

Mass flow controller MFC

Process controls H3700, H1700 (PLC) including remote maintenance module

Temperature control as charge control with temperature measurement inside and outside the retort

Indirect and/or direct cooling

Heat exchanger with closed-loop cooling water circuit for door cooling

Oxygen sensor and dew point sensor

Parallel swing door or electric bayonet catch

Retort, made of 2.4633 for Tmax 1150 °C

External switchgear with or without cabinet cooling

Charge support or custom-built charging trolley

Temperature uniformity optimized according to DIN 17052 or AMS2750F to +/− 5 °C in empty work space.