MODEL HR-81 FIBER DRAWING FURNACE

The Model HR-81 fiber drawing furnace is designed for operation to 2400°C with preforms up to 61 mm in diameter. The furnace features a simplified long-life, high-purity graphite resistance element which delivers concentrated heat through a linear graphite tube (available with a split liner for altering the hot zone profile) that serves to protect the element and control inert gas flow. Encapsulated graphite felt insulation surrounds the heating element. Protective inert gas flow routing is simple and effective with top and bottom gas screens, top adjustable iris assembly and bottom water-cooled slide door assembly. Safety interlocked top and bottom plugs permit convenient evacuation and backfilling of the furnace prior to operation. A 30 kVA power supply is also included, complete with a separately housed main transformer in a NEMA enclosure and 10 feet of flexible power cables to couple the furnace to the transformer.

The Model HR-81 drawing furnace coupled with Thermal Technology’s Gas Purification and Oxygen Analyzer will produce excellent element life in excess of 1000 hours.

OPERATING GAS

The furnace MUST be operated with an inert gas (helium, argon, or an argon/helium mixture). The gas must be dry and oxygen-free (less than 1 PPM water and oxygen). The use of Thermal Technology’s Gas Purification System (Model IGP-1B) is recommended.

RECOMMENDED ACCESSORIES

• Vacuum Pump
• Gas Purification and Oxygen Analyzer
• Optical Pyrometer
• Temperature Controller