Type J Thermocouple Wire

Type J Thermocouple Wire

Type J Thermocouple Wire has temperature operating range of 32 to 1400°F (0 to 760°C). The positive Iron and negative Nickel Copper (Constantan) alloy pair is one the oldest thermocouple alloys and remains in high regard today with it excellent accuracy in a specific temperature range and its ability to work well in Vacuum or a Reducing Atmosphere. 

  • Type J thermocouple wire can have excellent 1.1 F (0.5 C) Accuracy in the 212 to 932 °F (100 to 500 C) temperature range
  • Industries and Applications who commonly use Type J are automotive testing, heat treating of aluminum, curing composites, vacuum applications and the overall plastics processing
  • Wire Sizes can range from fine diameter 40 gage (0.003") to the very large rugged 14 gage diameter (0.064"), although most applications utilize a narrower range of 30 gage (0.010") to 20 gage (0.032")
  • Insulations typically include plastics of PVC or Fluoropolymers such FEP, PFA and Polyimide for temperatures from 32 to 600°F, and Fiberglass for temperature above 600 to 1400°F 
  • Type J bare thermocouple wire consists of the Positive wire made of Iron and the Negative wire made of Constantan (Nickel Copper alloy)
  • ANSI (American National Standard Institute) Color Code for Type J Thermocouple wire is White on the positive wire and Red on the Negative Wire. 
  • The Positive Iron wire in the Type J thermocouple is susceptible to Corrosion and for the sensor to function properly in wet and or corrosive applications the wire should be completely encased or protected by the plastic insulation.

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