Cartridge heaters vary in maximum temperature, power density, length, etc., so there are different types and different ways of heating.
The basic structure of all cartridge heater heating elements is the same in terms of wiring, core wire and shell, but the metals, wires and core wires used are different. The material of the cartridge heater largely determines its quality and life.
1. Thermocouple Cartridge Heater
Cartridge heaters with thermocouples heat the surface directly and use complex formulas to determine wattage, density and fit. The internal thermocouple is the sheath temperature, which makes them very useful in situations where space is limited. The power supply and sensor leads of the thermocouple are placed outside the sheath together. There are a variety of thermocouple cartridge heaters designed for specific applications. Thermocouples can be installed in the middle or inside the heater.
2. Flange Cartridge Heater
Flange Cartridge Heaters can be connected to the part to be heated, and the flange is permanently attached to the outer end of the heater. This type of configuration ensures a safer installation of the heater.
3. Swaged Cartridge Heaters
During the swaging process, all elements are added to the heater, including the core, resistance wire, and oxide powder, prior to the swaging process. Mechanical swaging forces the heater into a die that restricts and reduces its diameter and compacts the internal components. This process enhances the heat transfer process and improves efficiency.
4. Micro Cartridge Heaters
The specifications for micro cartridge heaters are three inches in length or less and 3.175 mm, 3.97 mm, 4.76 mm in diameter. The exterior of micro cartridge heaters is usually made of 304 or 316 stainless steel. Most micro heaters are shock and vibration resistant as well as dielectric strong.
5. Multi-zone Cartridge Heaters
For multi-zone cartridge heaters, each section of the heater has its own wound coil and power wire, with two leads for each zone. In some configurations, the zones will have a single common wire for one of the leads, which allows for control of the individual sections. One benefit of a multi-zone system is the ability to shut down a zone when it is not needed, thereby reducing the energy required.
In addition to the above types, there are many other types of cartridge heaters. If you are interested, please feel free to consult us!