Immersible heaters

Details Immersible heaters Immersible heaters

H - Electricity

05

B

309/14, 309/85

H05B 3/34 (2006.01) H01C 7/02 (2006.01)

Patent

CA 1146206

RAYCHEM CORPORATION CASE NO. MP0289 A B S T R A C T The invention relates to self-limiting electrical heaters comprising polymer PTC elements. A water-impermeable barrier surrounds the PTC element and the electrodes so that the heater can be immersed in water substantially indef- initely without damage thereto. A preferred beater is a water bed heater comprising an elongate PTC core having electrodes embedded therein and a barrier in the form of a polyester/aluminium/polyester laminate spirally wrapped around the PTC element and sealed to itself and to the underlying surface.

344331

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