The Dumbbell style elements, with the enlarged cold ends, were one of the earliest designs of the heating elements, which were originally made oversized to increase the cold end cross section, lowering electrical resistance so as to lower the operating temperature of the cold ends.

Following should be provided when inquiring or ordering DB (Dumbbell) Silicon Carbide Heating Elements:



Type: DB

Outer Diameters: of the Hot Zone (D1) and of the Cold Zone (D2), mm

Length: of the Heating Section or the Hot Zone, HZ, mm

Length: of the Cold Zone, CZ, mm

Overall Length: OL, mm

Example: Type DB, D1/ D2=18/28mm, HZ=300mm, CZ=350mm, OL=1000mm, Resistance 1.70�©

Specified as:

SPK DB18/28/300/350/1.70