Fire Assay/Cupellation Furnaces up to 1300 °C
The Nabertherm Cupellation & Fire Assay Furnaces are “Made in Germany” for separating precious metals up to 1300 °C. These special application furnaces feature a robust **ceramic muffle** to protect from aggressive gases and an **integrated exhaust hood** for safe ventilation.
The Nabertherm Cupellation Furnace is a “Made in Germany” solution, specially designed for the very demanding process requirements of **fire assay (cupellation)**. This process, for example, is used to separate precious metals like gold or silver from alloys with base metals. However, this process releases aggressive gases that attack standard furnace insulation and heating elements.
Nabertherm built these furnaces to solve this exact problem. As a result, they feature a protective ceramic muffle and a special fresh-air and exhaust system. This system guides exhaust gases directly into the integrated exhaust hood while pre-heating fresh air for the furnace atmosphere. In addition, all wear and tear parts, like the muffle and heating elements, are designed to be replaced easily.
Standard Equipment of Cupellation Furnace N 4/13 CUP
- Compact tabletop model.
- Features a ceramic muffle to protect heating elements and insulation.
- The furnace heats from three sides (floor and both sides) with heating elements on support tubes.
- Dual-shell housing of textured stainless steel with fan cooling provides for low surface temperatures.
- Includes an integrated extraction system (exhaust hood) to connect to your facility’s exhaust.
- Fitted with a manual lift door.
- Comes with NTLog Basic for Nabertherm controller for USB data recording.
Standard Equipment of Cupellation Furnaces N 10/13 CUP and N 30/13 CUP
- Includes a ceramic muffle for protection.
- The furnace heats from 4 sides with heating elements on support tubes (easy to replace as one unit).
- A ventilated furnace chamber provides additional protection for the heating elements.
- Precise temperature control with a control thermocouple placed directly in the muffle.
- Comes with an electro-mechanic lift door for N 30/13 CUP (optional for N 10/13 CUP).
- Features a bench/surface in front of the muffle.
- A special fresh-air and exhaust air system with an adjustable air exchange rate is standard.
- Includes an integrated extraction system (exhaust hood) to connect to your facility’s exhaust.
- Comes standard with an over-temperature limiter with adjustable cutout temperature.
- Includes NTLog Basic for Nabertherm controller for USB data recording.
Standard Equipment of Pit-Type Furnace S 73/HS (for Crucible Melting)
- Compact pit-type furnace designed specifically for crucible melting.
- Features a split lid that you open manually by swiveling.
- Heating from four sides.
- SiC tiles protect the heating elements and floor from friction and aggressive substances.
- A ventilated furnace chamber adds protection for the heating elements.
- Includes an exhaust air box with an insulated tube to the rear for connection to an extraction system.
- Comes with NTLog Basic for Nabertherm controller for USB data recording.
You can upgrade your Nabertherm cupellation furnace with several options to match your laboratory’s workflow and safety protocols.
Additional Equipment for Cupellation Furnace N 4/13 CUP
- Over-temperature limiter with adjustable cutout temperature to protect the furnace and load.
Additional Equipment for Cupellation Furnaces N 10/13 CUP and N 30/13 CUP
- Electro-mechanic lift door (for N 10/13 CUP).
- Swiveling inspection window (heat protection).
- Timer to program switching on and off times.
- Base mounted on castors.
Additional Equipment for Pit-Type Furnace S 73/HS
- Manual or pneumatic rolling lid.
- Over-temperature limiter with adjustable cutout temperature to protect the furnace and load.
- Timer to program switching on and off times.
Related Products:
These furnaces are part of our complete range of Nabertherm laboratory products. Furthermore, for other high-temperature processes, see our HT Series High-Temperature Furnaces.
This series includes three dedicated cupellation furnaces (N series) and one pit-type furnace (S series) for crucible melting. In summary, all are “Made in Germany” for the harsh fire assay environment.
Fire Assay Furnace Model Specifications
| Model | Tmax (°C) | Inner (w x d x h) mm | Volume (L) | Outer (W x D x H) mm | Load (kW) | Electrical | Weight (kg) |
|---|---|---|---|---|---|---|---|
| N 4/13 CUP | 1280 | 185 x 250 x 80 | 3.7 | 600 x 770 x 750 | 3.0 | 1-Phase | 100 |
| N 10/13 CUP | 1300 | 250 x 540 x 95 | 8.0 | 900 x 1200 x 1850 | 15.0 | 3-Phase | 380 |
| N 30/13 CUP | 1300 | 250 x 500 x 200 | 25.0 | 1000 x 1200 x 2250 | 15.0 | 3-Phase | 430 |
| S 73/HS | 1300 | 530 x 380 x 360 | 73.0 | 1050 x 1530 x 900 | 26.0 | 3-Phase | 890 |
Note: Outer dimensions may vary with additional equipment. Outer dimensions (W) for N 10/13 CUP & N 30/13 CUP are plus 200 mm for the controller.