A cartridge heater with controller works by heating a cartridge filled with magnesium oxide. This MgO is then heated by an electrical load and a heating coil. This coil is made of a nickel-chromium alloy, also known as nichrome. The number of spirals per inch depends on the watt density. A nichrome heating coil is then wound around a ceramic core. An alternating current source is used to power the heater. This current flows through the coiled nichrome wire and heats it.
A Typical Cartridge Heater Has A Heating Coil That Consists Of A Copper Or Nickel Chromium Wire
The watt density is another factor that affects the lifespan of a cartridge heater. The higher the density, the higher the temperature inside the heater. The higher the temperature, the shorter its life. The internal construction of a cartridge heater is made of several components, including a ceramic core, resistance wire, sheath, and lead wire. Manufacturers arrange these components in varying ways to enhance the heater’s performance. To choose a cartridge heater, consider its rating, size, and watt density.
Unlike conventional coils, the insulated leads of a cartridge heater have non-stick coatings. This coating serves as both a corrosion inhibitor and a solid lubricant. The coating prevents the heater from sticking to a surface, which reduces downtime caused by “sticky” heaters. You can also install a loop in the lead wire for extended lead life. However, when you install a cartridge heater, it’s important to remember to anchor the leads.