Description

Type J thermocouples are widely used in industrial applications due to their robust construction, strong signal output, and cost-effectiveness. These thermocouples are particularly well-suited for applications where a strong EMF signal is required and where oxidizing atmospheres are not a major concern at higher temperatures.  

Key Features and Benefits:

• Accurate and Reliable Measurement: Type J thermocouples provide accurate temperature readings within their specified range, ensuring precise process control and monitoring.  
• Strong EMF Signal: The relatively high output of Type J thermocouples (approximately 50 µV/°C) makes them less susceptible to noise and interference, resulting in more stable and reliable readings.
• Cost-Effective Solution: Compared to some other thermocouple types, Type J thermocouples offer a good balance of performance and affordability.  
• Variety of Configurations: Available in various configurations to suit different application needs (see “Available Options” below).

Available Options 

• Insulation Options:
  • Fiberglass Insulation: Offers good high-temperature performance and flexibility. Suitable for dry environments. 
  • Silicone Rubber Insulation: Provides excellent flexibility and moisture resistance.
  • High-Temperature Glass Braid Insulation: Offers superior high-temperature performance and abrasion resistance.
  • PVC Insulation: Suitable for lower temperature applications and general purpose use.
• Sheath Materials:
  • Stainless Steel Sheath: Provides excellent protection against corrosion and mechanical damage.
  • Inconel Sheath: Offers superior high-temperature performance and oxidation resistance. 
• Junction Types:
  • Grounded Junction: Provides faster response times but is more susceptible to electrical noise.
  • Ungrounded Junction: Offers better electrical isolation but has a slower response time. 
  • Exposed Junction: Provides the fastest response time but is more vulnerable to environmental factors. 
• Lead Wire Options:
  • Various gauges and lengths available.
  • Shielded or unshielded options.
• Connector Options:
  • Standard connectors (e.g., miniature, standard)
  • Specialized connectors (e.g., with built-in transmitters)

Specifications:

• Thermocouple Type: J (Iron/Constantan)
• Temperature Range: -40°C to 750°C (Practical upper limit often lower)
• Sensitivity: ~50 µV/°C 
• Insulation: (Specify – e.g., Fiberglass, Silicone, High-Temp Glass)
• Sheath Material: (Specify – e.g., Stainless Steel)
• Junction Type: (Specify – e.g., Grounded, Ungrounded, Exposed)
• Lead Wire: (Specify gauge, length, shielding)
• Connector: (Specify type)

Typical Applications:

• Plastics processing (injection molding, extrusion)
• Heat treating and annealing
• Ovens and furnaces
• Industrial equipment monitoring
• Food processing
• Textiles

Installation and Handling Instructions:

• Follow proper wiring procedures for thermocouples.
• Protect the thermocouple from mechanical damage and excessive bending.
• Consider the application environment when selecting the appropriate insulation and sheath materials.