Cartridge Heaters
General information
Thanks to their special design, cartridge heaters can withstand extremely high surface loads, thereby enabling high power outputs to be achieved in very compact spaces. They are primarily used in the plastics industry, in tool and mould making, and for heating ovens and presses.
Specifications
The heating cartridge consists of an insulating core wrapped in Ni-Cr 80/20 heating wire and compacted magnesium oxide, all enclosed in a stainless steel sheath.
When highly compacted, the surface load of the cartridge can reach up to 50 W/cm². This results in effective heat transfer. The maximum operating temperature is 750 °C at the sheath; however, this is not transferred to the medium being heated.
Standard diameter metric (mm)
Ø6.5 mm | Ø8.0 mm | Ø10.0 mm | Ø12.5 mm | Ø16.0 mm | Ø20.0 mm |
Tolerances for metric diameters: -0.02 to -0.06 mm
Standard diameters in inches (")
Ø1/4" | Ø5/16" | Ø3/8" | Ø1/2" | Ø5/8" | Ø3/4" |
6.30 mm | 7.90 mm | 9.46 mm | 12.61 mm | 15.81 mm | 19.05 mm |
Tolerances for diameters in inches: +0.02 to -0.02 mm
Heating cartridges are available in a wide range of diameters and lengths. In general, any diameter between 3 and 25 mm is possible. Larger diameters and square heating cartridges are available on request.
Length Tolerances | up to 130 mm +/- 2 mm |
from 130 mm +/- 1,5% |
For standard heating cartridges, the cable length is 1,000 mm of glass fibre stranded wire. For special heating cartridges, the cable length is at least 250 mm.
Quality control:
Insulation | 5 MOhm at 500 V |
High-Voltage Strength | 1500 V |
Power Tolerance | +5% to -10% |
Heating cartridges can be manufactured with or without a built-in Fe-CuNi thermocouple in accordance with DIN 43710. A NiCr-Ni thermocouple is also available on request. A wide range of connection types and protective sleeves are also available.
Installation and commissioning
Care must be taken to avoid any deformation of the heating element during installation. Difficult installation conditions should be taken into account at the design stage. The heating elements must only be operated with a suitable temperature control system.
The following points must be observed:
It is recommended to use a high-temperature lubricant when installing heating cartridges. This is electrically non-conductive and has excellent release properties. This makes it easier to insert the heating cartridge into its bore. However, care must always be taken to ensure that no mechanical damage occurs to the metal parts or the wiring. The heating element must not be put into operation until installation is complete.
Storage:
The heating element must be stored in a dry and dust-free environment. If stored in too humid conditions, the insulation material used may absorb moisture, posing a risk of short-circuiting.
If you have any questions, please contact us!
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Contact details
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