Cartridge heaters - special applications

In most cases, cartridge heaters are inserted into holes made in metal supports used within the heating process. These holes, to ensure maximum heat exchange between the heater and the tube and prevent the heater itself from overheating, must have optimal and precise tolerances.

General Characteristics

Cartridge heaters are an excellent solution where there is a need to heat particular applications with critical operating conditions.

These types of heaters can be designed, for the type of application, with high specific power and excellent reliability.

Low power density cartridge heaters with specific powers up to 6 ÷ 8 watt/cm2, unlike heaters with high power density they can reach up to 15 ÷ 20 watt/cm2, where temperatures can reach up to 700° C.

This type of heater is widely used in particular applications with maximum operating temperatures up to 700° C, such as:

  • Print heating
  • Injection chambers
  • Hot plates.

Technical Features

Cartridge heaters are designed with the following manufacture guidelines:

  1. Resistive wire in NiCr 80/20
  2. Industrial high purity Magnesium oxide insulation
  3. External metal sheath in stainless steel
  4. Power cables incorporated in the head without rigid parts
  5. Cartridge heater diameters according to the insertion hole
  6. Length depending on the applied power and operating conditions

Threaded connections of the heater on the process can be provided on request based on the diameter of the defined outer shell.

Cartridge heaters can also contain temperature detection sensors, to be used as a maximum alarm, to ensure a longer service life on the operation of the product. The sensors applied are “J” type Constantan iron thermocouples positioned near the bottom of the heater and isolated from the external metal sheath.

With this type of product, compared to the traditional heater, two main results are obtained:

  • specific powers and very high temperatures during its operation
  • a longer duration

Wide range of diameters, powers and lengths for every need and also special solutions on request.