Tempco Hi-Density Cartridge Heater HDC29478 4 PACK

Tempco Hi-Density Cartridge Heater HDC29478 4 PACK

Features of the Tempco Hi-Density Cartridge Heaters:

• The standard termination for Hi-Density Cartridge Heaters is Type N, 10″ (254 mm) long nickel conductor lead wires externally connected to 1-1/4″(32 mm) solid conductor terminal pins. The lead wires have fiberglass insulation and are UL approved for temperatures up to 482 F (250 C). Mica insulated UL approved wires for temperatures up to 842 F (450 C) are optional.
• High temperature fiberglass sleeve provides maximum electrical insulation to the crimp connector used to splice the nickel conductors to the flexible leads.
• Ceramic end cap prevents nickel conductors from shorting out against sheath when sharp bending of the leads is required. The ceramic cap may be eliminated in some cases to optimize the heater watt density.
• Ceramic end cap and swaged-in lava plug protect the internal cartridge from outer contamination. Other types of seals can also be provided.
• Solid conductor terminal pins are used to ensure a good electrical connection between the nickel conductor lead wires and the resistance wire. They are sized for the maximum current rating of the heater.
• A high purity Magnesium Oxide (MgO) powder consisting of custom grain sizes is used to fill all remaining space inside the sheath. Heater is then swaged, which compacts the magnesium oxide grains into a solid mass, thereby increasing thermal conductivity and dielectric strength.
• Standard sheath material is 321 Stainless Steel. It provides high temperature strength up to 1200 F (650 C), good thermal conductivity, and resistance to corrosion and scaling. Alloy 321 is a Nickel-Chromium Stainless Steel modified with the addition of Titanium. For higher operating temperatures up to 1400 F (760 C) or corrosive immersion heating applications, Incoloy 800 is available. Consult Tempco for other sheath materials.
• Grade A Nickel-Chrome resistance wire precisely wound on a high purity magnesium oxide core places the resistance wire as close to the inside of the sheath as possible while maintaining dielectric strength. This provides excellent heat transfer and long heater life with the highest possible watt densities.
• Welded end disc made from the same material as the sheath provides a positive seal against moisture and other contaminants.