Redcoil Mini Nozzle Band and Cartridge Heaters

 Prime consideration must be given to the selection of the heating element material and design since this is the limiting component in high performance coil heaters.

Major operational parameters involved include maximum temperature, time at maximum temperature, and both number and rate of temperature cycles. Chemical and metallurgical effects involved include grain growth, element evaporation (especially in grain boundaries), diffusion, ordering and creep.

AKINSUN application engineers are qualified to help in your selection and design. To minimize control problems and shifts in heat flux profiles with changing temperatures, heating element should have very low temperature coefficients of resistivity (0.0001 per �C).

They should be stabilized with appropriate chemical additives that inhibit grain growth. Conventional heating alloys such as the Nichromes, Tophets, Chromels and Kanthals (among others) have even lower coefficients and have stabilizing additives. Certain nickel base alloys such as some Inconels, some Hastelloys and some Cupro-Nickel alloys exhibit similar characteristics. Pure metals do not normally make good heating elements because they have high temperature coefficient of resistivity and are not stabilized. This would cause a large variation in resistance with a change in temperature and would interfere with the desired operation and heat flux profile of many types of heaters.

• Withstands shock and vibration
• Good contact with walls of holes
• Fast time responds
• Suitable for temperatures up to 600�C (1115�F)
• High Watt density
• Sheath is welded closed at the end for a complete seal
• Can be supplied with or without thermocouple
• Gives good contact with walls of hole
• Easy to remove from blind hole - does not seize
• Flexible
• Inserted into rough drilled hole of curved hole

These heaters could be used as direct replacement for cartridge heaters. Especially where the holes have enlarged due to repetitive drilling during replacing cartridge heater.

Specify exact outside diameter of the coil length, watts, volts and cold tail.