Fe-CuNi Type J Thermocouple Compensating&Extension Wire for Scientific Applications

Type J thermocouples consist of iron (Fe) and copper-nickel (CuNi), with the positive wire being black and the negative wire white. They are marked with JX for thermowire and JC for compensating wire, although DIN EN 60584-3 does not define compensating wires for Type J. Type J thermocouples operate from -40°C to +350°C, with extension wires rated for 0 to 200°C . They are suitable for short-term use up to 750°C and long-term use up to 600°C. They are used in vacuum, oxidizing, reducing, or inert atmospheres, making them ideal for industrial processes, air conditioning technology, and complex industrial applications. The extension wires have a conductor cross-section of 0.22 mm², an outer diameter of approximately 3.4 mm, and are halogen-free, flame retardant, and self-extinguishing. Type J thermocouples have a tolerance class of ±1.5°C/±0.4%t, ensuring accuracy in temperature measurement.

In summary, Fe-CuNi Type J thermocouples and their extension wires are robust, versatile, and accurate tools for temperature measurement in a wide range of industrial and technical applications.

color codes of thermocouple ( J type )

The operating temperature range of type J thermocouple is -210~1200℃ , but it is usually used in the temperature range 0~750℃ due to embrittlement of Iron.

Type J thermocouple has good resistance to oxidation and high EMF output against Platinum 67, with good temperature accuracy, sensitivity and stability. It is recommended for vacuum, oxidizing, reducing or inert atmospheres, but it can not be used in sulphurous atmosphere above 500℃ .

Thermocouple temperature range and tolerance

Some Key Features Fe-CuNi (Type J) Constantan Thermocouple Extension Wire include:

• Temperature Range: Type J thermocouples are designed for a broad temperature range from -180°C to +700°C, with an operating range specified in the standard DIN EN 60584 from -40 to +750°C.
• Material Composition: The positive leg (Fe) is made of 99.5% iron with small amounts of manganese and copper, while the negative leg (CuNi) consists of approximately 55% copper and 45% nickel, with minor amounts of cobalt, iron, and manganese.
• Physical Properties: Type J thermocouples have a density of 7.8 g/cm³ for the iron (JP) leg and 8.9 g/cm³ for the copper-nickel (JN) leg. They also have a high tensile strength and elongation, with a resistivity of 0.12 μΩ·m for the JP leg and 0.49 μΩ·m for the JN leg.
• Standards and Compatibility: Type J thermocouples comply with the IEC60584-1 standard, ensuring global consistency in quality and performance.
• Resistance to Oxidation: Type J thermocouples have good resistance to oxidation and offer a high EMF output against Platinum 67, making them suitable for use in vacuum, oxidizing, reducing, or inert atmospheres.
• Color Coding: According to international standards, Type J thermocouples have a black sheath, with the positive iron wire also black and the negative constantan wire white. They are marked with JX for thermowire and JC for compensating wire, although DIN EN 60584-3 does not define compensating wires for Type J.
• Applications: They are used in aerospace, energy chemical, oil exploration, mechanical and electrical equipment, and high-frequency discharge lamp fields due to their resistance to high temperature, pressure, and radiation.
• Insulation and Sheath Material: Type J thermocouples can be equipped with various insulation materials such as fiberglass, Kapton, silicone, and PFA-Teflon, allowing for use in different temperature ranges and environments.

These features make Type J thermocouple extension wires a reliable choice for temperature measurement in a variety of industrial and scientific applications.

Applications:

• High-Temperature Environments: Type J thermocouples are suitable for applications at high temperatures in vacuum, oxidizing (air), reducing, or inert atmosphere (inert gases). They are particularly useful in furnaces and kilns where high temperatures are required.
• Plastic Industry: They are used to control and measure the processing temperatures of injection molds, ensuring the quality and consistency of plastic products.
• Food Industry: Type J thermocouples are used in various food industry equipment such as ovens and refrigerators, which require accurate temperature control for safety and quality.
• Metal Heat Treatment: In manufacturing, Type J thermocouples are used for the heat treatment of metals like steel, given their strength and efficiency at moderate temperatures.
• Automotive Industry: They are used for monitoring component temperatures within vehicles, ensuring performance and safety.
• Aerospace Industry: Type J thermocouples are used in aerospace applications where high temperatures and reliability are critical.
• Medical Applications: They are used for monitoring body temperature during surgery, providing accurate temperature readings in a sterile environment.
• Laboratory Settings: Type J thermocouples are used in laboratory experiments that involve high temperatures, offering precise temperature measurement.
• HVAC Systems: They are used for indoor climate management, ensuring comfort and energy efficiency.
• Petrochemical Sector: Type J thermocouples are used in the petrochemical industry for process control and in power generation facilities to monitor turbine temperatures.

These applications highlight the versatility and importance of Type J thermocouples in a range of industrial and scientific settings where accurate temperature measurement is essential.