November 2

Watt-Flex Split Sheath Cartridge Heaters

  • Overview
  • Description
  • Mods and Accessories
  • Stock List
  • Custom Designs
  • Last 5X Longer
  • Higher Watt DENSITY & Temps
  • Uniform Temps
  • Maximize Heat Transfer
  • Use in OVERSIZED Bores
  • Ease of Removability
  • Hot and Cool Options
  • External Thermocouples

External Thermocouples

Exclusive Watt-Flex Split Sheath Cartridge Heaters Option

Watt-Flex split-sheath cartridge heaters can be manufactured with a groove along the exterior of the cartridge to accommodate a needle-type thermocouple for more accurate temperature sensing and control.

Watt-Flex Split Sheath Cartridge Heaters

Watt-Flex external thermocouples out perform internal monitors used in conventional heaters. With Watt-Flex Cartridge Heater, you can:

  • Measure temperature at the precise point of heat transfer. Unlike conventional heaters with internal thermocouples that measure internal heater coil temperature, Watt-Flex external thermocouples measure more precisely at the point where heat transfers from the heater to the host metal.
  • Monitor temperature at any point along the heater. Hampton Controls Watt-Flex heaters give you the flexibility to monitor heat at any point along the heater, instead of at pre-defined fixed points with internal monitors in conventional heaters.
  • Replace heater or thermocouple independently. With Watt-Flex external thermocouples, you can replace either the heater or the thermocouple independently, without having to replace an operational component as with conventional heater designs.

Thermocouple Specifications

Maximum lengths:

  • 15" maximum for grooved heaters with 1/4" or 3/8" diameter heaters.
  • 7" maximum for grooved heaters with 1/2" diameter heaters.

Longer heaters using 1/2" diameter or larger heaters, can be center- grooved between the legs to any depth between 6" to 15".


  • Type J  with 48" leads.
  • Type K with 48" leads.

Needle diameters:

  • 0.040" for 1/4" diameter heaters and all center grooves.
  • 0.062" for side-grooved 3/8" and 1/2" diameter heaters.

See our Large Supply by Clicking on the Stock List Tab above or Configure your Watt-Flex Heaters here.

Contact Hampton Controls for more info: ​724-861-0150       

Please call for any special needs, in most cases, we are able to create a custom solution.     


Watt-Flex Split Sheath Cartridge Heaters

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