Options for specific applications or processes

Inconel retort

• An inconel retort allows the use of a gas atmosphere in a chamber furnace
• Clamp front retorts (type A105) are available to suit models CWF 12, 13 & 23 litre sizes and GPC 12, 36, 65, 131 & 200 litre sizes
• A retort similar to a pack carburising box, (type A107) using a sand seal between the deep base and the shallow removeable lid, suits models CWF12, 13 & 23 litre sizes and GPC12, 36 & 65 litre sizes
• A gland can allow access for a probe thermocouple inside the retort

Gas & air flow

• Gas flowmeters can be fitted to suit a chamber furnace fitted with a retort, or a tube furnace with a worktube and a gas inlet
• To allow the control of the following gases: argon, carbon dioxide, hydrogen, nitrogen and oxygen
• A solenoid valve can be used to control gas flow
• A gas safety system is required when using hydrogen, which ensures fail safe burn off of waste gas, shown in picture above

Cascade control

• A standard control system senses the temperature close to the heating elements, while the temperature of the load is usually slightly lower
• To correct this a second controller can be added, one senses the load, the other the elements
• The load controller sends signals to the element controller, which adjusts the element temperature accordingly
• Faster warm up is achieved by boosting the element temperature when the load is cold, and by reducing it as the load approaches the desired temperature
• Normally a 2216 secondary controller is fitted in addition to a main 3216 or 3508.

Thermocouple calibration port

• An additional ceramic sheath adjacent to the control thermocouple and accessed through the back of the furnace allows the insertion of users' own reference thermcouples for checking or calibration

Access/ viewing port

• A 25mm diameter port in the furnace door
• Unglazed with stainless steel pivoted cover or glazed with fixed quartz glass window