Cartridge heaters. (Equipment).

Watt-Flex split-sheath cartridge heaters are available with a choice of leads to accommodate a variety of process heating applications. Options include flexible stainless steel hose or braid to protect against frequent flexing and abrasion, straight or right angle headers, extra-long leads, high-temperature leads, threaded post terminals, fiberglass or silicone rubber sleeving, an internal ground wire and a quick disconnect lead with a convenient male plug, according to the manufacturer. Because of their split-sheath design, Watt-Flex heaters are said to run more efficiently, last longer and are more easily replaced than conventional heaters, dramatically reducing the overall cost of process heating, according to the manufacturer. Split-sheath construction allows each half of the heater to expand independently when energized, maximizing metal-to-metal contact with the surrounding bore, according to the company. This in turn is said to maximize heat transfer, even in oversized bores. Maximum compaction of magnesium oxide around the coil is said to provide superior heat conduction to the outer sheath. (Dalton Electric Heating, 28 Hayward St., Ipswich, MA 01938)

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