Sense-well Controls manufactures Cartridge Heaters. Sense-well Controls provides a whole range of accurate, rugged and reliable electromechanical temperature controllers &Cartridge Heaters. The Cartridge Heaters are of robust construction and consist of high grade alloy, spiral elements evenly stretched and threaded through an assembly of suitable fluted refractory bobbins. These elements are sheathed in treated seamless brass tubes of required outer diameter and filled with fused magnesia. The Cartridge Heaters are either made of Stainless Steel or of Brass.