Cartridge Heaters Tech Info

Cartridge heater installation tips

Thermal Corporation's cartridge heaters may be used for many heating applications, but they are most often used to heat blocks of metal (such as dies on injection molding machines) by insertion into drilled holes in the metal. When used in this application, the major factors influencing heater lifetime are the watt density on the heater surface, the fit in the hole and operating temperature.

Cartridge heaters are also used for the heating of water and water-based liquids of low viscosity by the addition of a threaded header on the lead-end of the heater. The small size and big capacity of swaged cartridge heaters make them ideal immersion heaters in cramped quarters. For water heating applications, a rating of of 150 to 300 watts per square inch is recommended (much higher ratings are possible for conditions of high water flow rate over the heater.

Cartridge Heater Configuration Options:
Swaged Leads:
Lead wire is connected to the pin wire inside the heater.
Superior resistance to flexing where the lead wire enters the heater and allows sharp angles where the lead wire exits the heater.
Right Angle Leads:
Avoids interference
Hose:
Abrasion resistance
Less susceptable to plastic contamination
Braid:
Abrasion resistance
More flexible than hose
Teflon:
Resists oil and moisture
Good up to 480 degrees F




Cartridge Heaters should not enter or extend outside the drilled hole.
With the heater flush with the surface, the lead wire connections run at a cooler temperature and a weak spot is not created.
If part of the heater extends outside the hole, the air will not remove the heat as quickly as the metal inside the hole. This causes the heater outside the hole to heat up very quickly and cause premature failure of the heater.
Do not expose lead wire to a temperature greater the 700°F
Cartridge Heater Home Cartridge Configurations Updated October 23, 2006

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