Fe-CuNi Type J Thermocouple Extension Wire for Versatile in Various Industrial and Scientific Applications

Type J thermocouples have a standardized temperature range of -180°C to +700°C.They are also specified to operate from -40°C to +750°C with a limiting deviation of ±1.5°C or 0.40% in Class 1. The positive leg (Fe) is made of 99.5% iron with traces 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. The conductor cross-section is 0.22 mm², and the outer diameter is approximately 3.4 mm. The minimum bending radius is 7.5 times the diameter. The insulation is rated for fixed laying from -40°C to +180°C, flexible application from -25°C to +180°C, and short-term use up to +250°C. The cable is halogen-free and complies with fire performance standards, being flame retardant and self-extinguishing.

According to international standards, Type J extension wire is identified with black/white (black sheath) color coding, with the black color representing the positive iron (Fe) wire and white for the negative copper-nickel (CuNi) wire. Type J thermocouples are suitable for high-temperature applications in vacuum, oxidizing, reducing, or inert atmospheres. They are recommended for use up to 750°C due to the embrittlement of iron at higher temperatures.

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 have a standardized temperature range of -180°C to +700°C. They can operate from -40°C to +750°C with a limiting deviation of ±1.5°C or 0.40% in Class 1, and from -40°C to +750°C with a limiting deviation of ±2.5°C or 0.75% in Class 2.

• Material Composition:

- The positive leg (Fe) is made of 99.5% iron, approximately 0.25% manganese, and approximately 0.12% copper, with the rest being other impurities.

- The negative leg (CuNi) consists of 55% copper, 45% nickel, and approximately 0.1% cobalt, iron, and manganese.

• Properties and Applications:

Type J thermocouples are suitable for high-temperature applications in vacuum, oxidizing, reducing, or inert atmospheres. They have good resistance to oxidation and high EMF output against Platinum 67, with good temperature accuracy, sensitivity, and stability.

• Extension Wire Specifications:

Extension wires for Type J thermocouples are designed to maintain the temperature range of -50°C to +350°C. They are made with a glass fibre insulation, a sheath material of Besilen® EM9, and are braided with fibre-glass with a tracer. The conductor cross-section is 0.22 mm², and the outer diameter is approximately 3.4 mm.

• Technical Data:

The minimum bending radius for the extension wire is 7.5 times the diameter (7.5 x d). The temperature range for insulation is -40°C to +180°C for fixed laying, -25°C to +180°C for flexible application, and short-term use up to +250°C. The wire is halogen-free and complies with various international standards including RoHS directive for the absence of harmful substances.

• Customization:

Type J extension wires can be customized with different lengths and connectors to suit specific application needs.

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 environments where other types of thermocouples might not perform well due to their resistance to oxidation and high EMF output against Platinum 67.
• Industrial Processes: They are used in industrial processes that involve high-temperature monitoring, such as the manufacturing of plastics and resins. Type J thermocouples excel in these processes due to their good temperature accuracy, sensitivity, and stability.
• Vacuum Environments: Type J thermocouples are recommended for use in vacuum environments due to their ability to function well in the absence of air.
• Non-Reactive Materials: They are used for monitoring temperatures of inert metals and non-reactive materials such as sand, concrete, and asbestos-containing materials.
• Home and Industrial Machines: Type J extension wires are used in temperature connection wires for headlamps, home applications, industrial machines, and electrothermal products.
• Aerospace and Energy Chemical Industries: These thermocouples 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.
• Temperature Measurement: Type J thermocouples are used to make or extend signals from a thermocouple, which is a temperature measurement sensor consisting of two dissimilar metals joined together at one end.

These applications highlight the versatility and reliability of Type J thermocouple extension wires in a variety of high-temperature and specialized environments.

Company Overview:

Jiangyin Chengxin Alloy Material Co., Ltd has more than 20 years of experience as the lead.ing alloy wire manufacturer in China. We offer a wide range of services from fine wire drawing toresistance wire manufacturing. Since the beginning, our specialty has been the quality and preci.sion of our products. We have the tightest tolerances and deliver within a few days to a fewweeks. As a result, we have become the leading alloy wire supplier in the industry.

Senphus Subsidiaries:

• Jiangyin Chengxin Alloy Material Co., Ltd.
• Jiangyin Senphus Electrical Materials Co., Ltd.
• Jiangsu Xiangcheng Supply Chain Management Co., Ltd.

Jiangyin Chengxin Alloy Material Co., Ltd.: With nearly 20 years of experience, Jiangyin Chengxin is a leading alloy wire manufacturer in China. We offer a wide range of services, from fine wire drawing to resistance wire manufacturing. Our specialty lies in the quality and precision of our products, achieving the tightest tolerances and delivering orders within days to weeks. As a result, we have established ourselves as the premier supplier of alloy wire in the industry.

Our product range includes:

• Copper-nickel alloys (CuNi1-CuNi44)
• Karma (Nikrothal L/Evanohm/Alloy 800)
• Manganin and Constantan
• Nickel-chromium alloys
• Thermocouple alloys (Type K, N, E, T, J)
• Thermocouple extension wire
• PTC thermistor resistance alloy
• Pure nickel wire and Monel alloy

These alloys are available in various forms, including wire, ribbon, stranded, and enamelled. Major applications include seat heating, underfloor heating, military projects, aerospace, household appliances, heating wire, mechanical and electrical plants, and temperature instruments. Our manufacturing processes are ISO 9001:2015 certified, and we specialize in fine and ultra-fine wire drawing, offering wire diameters from 0.025 mm (0.001") to 13 mm (0.51") in small batches, medium volumes, and mass production. We maintain a comprehensive quality inspection system, including in-house chemical analysis, chromatographic analysis, metallurgical analysis, pinhole tests, wire construction tests, and tension tests to ensure the highest quality standards.

Senphus Electrical Material Co., Ltd.: Founded in 2003, Senphus Electrical Material Co., Ltd. integrates research, manufacturing, and sales of electric heating alloys, heating cables, heating wires, and heating products. Leveraging over a decade of technical expertise in heating alloy wire, we have adopted advanced heating cable technology and machinery, successfully developing heating cables, temperature controllers, and temperature control systems suitable for building heating, pipe insulation, outdoor snow melting, wind power blade production, car seat heating, and healthcare applications.

The company is recognized as a high-tech enterprise in Jiangsu Province and a small giant enterprise in Jiangyin City, specializing in innovative technologies. We operate the "Wuxi Heating Cable Engineering Technology Research Center" and collaborate with experts from renowned domestic universities. Our portfolio includes 5 invention patents and over 30 utility model patents, showcasing our strong research and development capabilities.

With an annual output exceeding 1,000 tons of thermal alloy wire and an output value of approximately 105 million yuan, our products are well-received in markets such as the UK, Italy, Canada, Peru, and Spain. Our heating cables generate an annual output value of over 80 million yuan, with exports to Germany, Japan, the United States, Malaysia, Denmark, Brazil, and other countries.

The company has successfully passed multiple quality management system certifications, including IATF 16949, ISO 9001, ISO 14001 (Environmental Management System), and ISO 45001 (Occupational Health and Safety Management System). Our heating cables and related products have also obtained test reports from the Shanghai Cable Research Institute Test Center and received certifications such as UL (United States), VDE (Germany), CE (European Union), and RoHS.

Commitment to Quality: We adhere to the business commitment of "Reputation First, Quality First, Customer First" and uphold the quality policy of "Integrity-Based, Quality-Oriented, Excellent Service." We are dedicated to providing accurate products and professional services, and we look forward to collaborating sincerely with you to achieve mutual success.