Electric channel heaters

Tubular electric heaters

consist of a thin-walled metal cover, made of a tube of the necessary diameter. In it there is a wire spiral of high specific electric resistance. Tips of a spiral are attached to contact cores, the contact devices equipped from outer side, current distributors are carried out in the form of tags or threaded connections. Between end faces of pipes and contact devices the insulator is established. The space in a cover filled with a filler which possesses high dielectric properties and has considerable coefficient of heat conductivity. As a filler the periclase is, as a rule, applied (it is a crystal oxide of magnesium). The end face is filled with sealant (a heat-resistant moisture-protective varnish), it lowers influence of external environment on electroinsulating functions of a filler of TENA in use and storages.