Fire Assay/Cupellation Furnaces up to 1300 °C

Cupellation is a process to separate precious metals, such as gold or silver, from alloys with base metals. During the process, aggressive gases that attack the insulation and the heating are released. Cupellation furnaces N ../13 CUP are especially designed for the very demanding process requirements.

The furnace chamber consists of a ceramic muffle, which offers very good protection for the heating elements and insulation against the vapors. A special fresh-air and exhaust air system guides exhaust gases directly into the exhaust hood of the cupellation furnace. At the same time, fresh air is lead into the furnace atmosphere. The integrated exhaust hood on top of the furnace and above the door is the interface to the customer’s required exhaust air system. The design is very-maintenance friendly; all wear and tear parts on the furnace, which are f.i. the ceramic muffle and the heating elements, can be replaced easily.

Cupellation furnaces N 4/13 CUP as a tabletop model and N 10/13 CUP are designed especially for cupellation. Due of its high chamber design, model N 30/13 CUP can also be used for crucible melting. Pit-type furnace S 73/HS is especially designed for crucible melting.

Standard Equipment of Cupellation Furnace N 4/13 CUP
Compact tabletop model
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)
Ceramic muffle to protect the heating elements and insulation
Furnace chamber is heated from three sides (floor and sides) with heating elements on support tubes
Extraction system with integrated exhaust hood on top of the furnace and above the door to connect to the customer's exhaust air system
Manual lift door
Defined application within the constraints of the operating instructions
NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Standard Equipment of Cupellation Furnaces N 10/13 CUP and N 30/13 CUP
Ceramic muffle to protect the heating elements and insulation
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)
Furnace chamber is heated from 4 sides with heating elements on support tubes
The heating elements can be easily replaced as one unit
Furnace chamber ventilated as additional protection for the heating elements
Precise temperature control with control thermocouple directly in the muffle
Closing brick for the muffle with handle for N 10/13 CUP
Electro-mechanic lift door for N 30/13 CUP
Bench/surface in front of muffle
Special fresh-air and exhaust air system for the ceramic muffle. Exhaust gases are directly guided into the exhaust hood via a ceramic tube at the back of the muffle. The air exchange rate is adjustable.
Extraction system with integrated exhaust hood on top of the furnace and above the door to connect to the customer's exhaust air system
Over-temperature limiter with adjustable cutout temperature  as temperature limiter to protect the oven and load
Defined application within the constraints of the operating instructions
NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Standard Equipment of Pit-Type Furnace S 73/HS
Compact pit-type furnace for crucible melting
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)
Split lid, opened manually by swiveling
Heating from four sides
Heating elements and floor protected against friction and aggressive substances with silicon carbide tiles
Furnace chamber ventilated as additional protection for the heating elements
Exhaust air box with insulated tube to the rear. Facilities for connection to customer’s necessary extraction system.
Defined application within the constraints of the operating instructions
NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive