Maxi-Zone High Temperature Insertion Heaters
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Designed for hot press metal forming applications, the Maxi-Zone High Temperature Insertion Heater produces continuous sheath temperatures to 2000°F/1095°C. An Inconel 600 sheath allows efficient operation at extreme temperatures. Because of this capability, many applications will observe considerable performance improvements with the Maxi-Zone versus other heat sources.
A unique feature of the Maxi-Zone is to provide two or three independently controllable areas along the sheath length. Precise temperatures can be produced in every location by arranging the process in multiple zones and monitoring and controlling each separately. The Maxi-Zone’s primary heat transfer method is by radiation. The continuing oxidation of the sheath and inside walls of the hole at these temperatures produce excellent transfer of heat. This emissivity improves with usage, allowing sheath and process temperatures to be nearly identical. Diameters are substantially undersized versus standard cartridge heater applications. A .935″ diameter Maxi-Zone would be applied in a 1″ or larger hole. A Maxi-Zone is easily removed and replaced. Standard Maxi-Zone diameters are .495″, .685″ and .935″ with lengths from 18 inches to 15 feet. .210″ diameter Inconel 600 sheath tubular heaters are available for heating ceramic presses in similar applications.
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 Inconel 600 sheath for temperatures to 2000°F/1095°CExact, uniform temperatures with 2or 3 independently controllable zones.495″ diameter available in singlezone only |
Radiant heat transfer allows undersizedheaters for easy removal and replacement |
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The diagram illustrates a nine zone platen with six, three zone Maxi-Zone Insertion Heaters. Each zone can be sensed and controlled individually. A platen with 6 elements can be designed with 6 zones utilizing a Maxi-Zone with 2 independent zones. For even more precise control, the platen can be comprised of even more zones, depending upon what’s practical.
Other plugs are available for single zone applications. |
 A .935″ diameter 240 volts single zone B .935″ diameter 240 volts two or three zone C .685″ diameter 240 volts single zone D .685″ diameter 240 volts two or three zone E .935″ diameter 480 volts single zone F .935″ diameter 480 volts two or three zone G .685″ diameter 480 volts single zone H .685″ diameter 480 volts two or three zone Consult BigChief for other diameter and voltage limitations |
Transition Adaptors
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Transition Bending Mounting brackets or stop washers in unheated area – Consult BigChief. |
Watt Density To determine watt density, cold areas need be subtracted from the Sheath Length to determine the Effective Heated Length. A 1-3/4″ cold area exists at the bottom end of the Maxi-Zone, and a 1″ cold area is necessary between zones. The cold area required at the termination area depends upon the ambient temperature. The minimum cold area is generally 18% of the entire heated length and is increased as the ambient temperature increases. Consult BigChief for design assistance based upon application requirements.
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