Cartridge Heaters www.tempco.com | (800) 323-6859 | email: [email protected] 2-53 Cartridge Heater Lead Wire Options Type IS Incoloy® Sheath Available on HDC and HDM cartridge heaters. The standard sheath material for all Hi-Density Cartridge Heaters except 1" diameter is 321 stainless steel; standard for 1" diameter is 304 stainless steel. The incoloy sheath option is available on all diameters except 1/8", 5/16", 8 mm and 20 mm. To assist you in selecting the proper sheath material, corrosion resistant ratings and chemical properties of various heater sheath materials are given in Section 16, Engineering Data, in the back of this catalog. Type DSM Other Special Sheath Materials If your application requires a specific alloy sheath material other than described in Type IS above, consult Tempco with your requirements. Type PAS Passivation Available on HDC, HDM, and LDC cartridge heaters. Passivating is a chemical process accomplished by dipping the heater in a solution of nitric acid. The process removes surface contamination, usually iron, so that the optimum corrosion resistance of the stainless steel is maintained. Type OAL Special Length Tolerance Available on HDC, HDM, and LDC cartridge heaters. If a special length tolerance different than the standard length tol- erance specified on page 2-4 is required, consult Tempco with your requirements. Type ELP Electro-Polish Available on HDC, HDM, and LDC cartridge heaters. Electro-Polishing is an electro-chemical process that removes surface imperfections and contaminants, enhancing the corrosion resisting ability of the heater sheath. Type CG Centerless Grinding Available on HDC and HDM cartridge heaters. For applications requiring high precision fit and tolerance, the sheath can be centerless ground. Tolerance: ±0.0005 inches (0.013 mm) Specify diameter when ordering. Type SDA End Disc Seals Silver Brazed Type SDB End Disc Seals Heli-Arc Welded Available on LDC cartridge heaters. End discs on HDC and HDM cartridge heaters are heli-arc welded as standard. The normally mechanically attached end discs on LD cartridge heaters can be silver brazed or heli-arc welded if desired. Cartridge Heater Options — Sheath Surface and Sheath Material Type MIL High Temperature Lead Wire Available on HDC, HDM and LDC cartridge heaters When required, high temperature lead wire can be used on most cartridge heaters. The stranded wire is insulated with mica tapes and then a treated fiberglass overbraid. ➤ Maximum temperature rating: 450°C (842°F) Type TL Teflon ® Leads Available on HDC and HDM cartridge heaters ➤ Maximum temperature rating: 200°C (392°F) Type HA Heat Shrink Covered Armor Cables Available on HDC, HDM and LDC cartridge heaters ➤ Either the galvanized or stainless steel armor cable can be cov- ered with moisture proof heat shrink Polyolefin tubing. Type HTL Very High Temperature Lead Wire Available on HDC, HDM and LDC cartridge heaters When required, high temperature lead wire can be used on most cartridge heaters. The stranded wire is insulated with mica composite and then a treated fiberglass overbraid. ➤ Available wire gauge sizes: 10-18 ➤ Maximum temperature rating: 550°C (1022°F) Type FS Uncoated Fiberglass Sleeving Available on HDC, HDM and LDC cartridge heaters For effective thermal and mechanical protection, the lead wires can be covered with uncoated fiberglass sleeving. FSA Uncoated Fiberglass sleeving on each lead separately FSB Uncoated Fiberglass sleeving on both leads together ➤ Specify length when ordering. ➤ Maximum temperature rating: 1112°F (600°C) Type SR Silicone Rubber Coated Fiberglass Sleeving Available on HDC, HDM and LDC cartridge heaters For added protection, strength, and resistance to various chemicals, the lead wires can be covered with silicone rubber sleeving. SRA Silicone rubber coated fiberglass sleeving on each lead separately SRB Silicone rubber coated fiberglass sleeving on both leads together ➤ Specify length when ordering. ➤ Maximum temperature rating: 200°C (392°F) Consult Tempco with your requirements. We welcome your inquiries.
