Cartridge Heaters are tubular formed industrial electrical resistance heating elements in different metric and imperial sizes. Heaters are manufactured to the customer’s specific application to significantly boost process equipment efficiency.

The square heater assembly consists of an element wound on shaped ceramic cores and securely connected to internal lead conductors. This assembly is centrally located within shaped tubing and voids are filled with ceramic insulation. The heater assembly is swaged to the final square cross-sectional dimensions to metallurgically bond the element wire to the lead conductors and to compact the internal ceramic core and ceramic insulation to near theoretical density. The densely compacted assembly provides the optimum heat transfer and insulation dielectric essential to heater performance and reliability and maximizes the heaters resistance to vibration, shock and physical abuse.

As an alternative to traditional round cartridges and their costly, time consuming deep hole drilling requirements, square cartridges utilize simple, cost-effective surface milled slot mounting systems. This approach provides close fits between the cartridge and tooling maximizing heat transfer and performance while still allowing easy heater removal for maintenance and cleaning. Lead channels added during the slot machining process provide total protection for the heater power leads while allowing routing of the leads to connectors or terminal strips at any desired location on the tool. A square cartridge forming option further simplifies heating of special shapes and can be utilized in heating both large and small tooling components.

Maximize Heat Transfer
The unique split-sheath design of the Watt-Flex Cartridge Heater allows the independent, bilateral expansion of each half of the heater outward against the walls of the surrounding bore.

Ideal for Use in Oversized Bores
The unique bi-lateral expansion of the cartridge heaters eliminates the need for tight fits and makes them well-suited for use in oversized bores where conventional cartridge heaters cannot be used effectively.

Heaters Eliminate Bore Seizure
The split-sheath design cartridge heater reduces your heater change-out costs by preventing heater bore seizure.

Available in brass, steel, or stainless steel pipe fitting which allows liquid tight installation through threaded openings.  Fittings are brazed to the heater.  Be certain the watt density and sheath material are compatible with the material being heated.  (Available in both NPT and Straight thread with O-Ring)  See chart for sizes available.

Cartridge Heater can be manufactured with flange located at any point along sheath with adequate unheated area.

Conduit Coupler Connector: Flexible conduit is attached with a copper coupler over-lapping the heater by 1/4″. Leads are 14″ long and cable 12″ unless specified.
Fig. 1B and 1C can be attached to stock items.

Additional Variations: Special Wattage Distribution. Specify percentage of overall wattage and length for each section. Typically, the entire length is divided into thirds with the overall wattage split into the following percentages: 40% at lead and bottom third of length with 20% in the middle, or, 35% at lead and bottom third of length with 30% in the middle