Fe-CuNi Type J Thermocouple Wire for Industrial Processes with Moderate Temperatures

Fe-CuNi Type J Thermocouple Wire is a widely used thermocouple material composed of a positive leg made of pure iron (Fe) and a negative leg made of Copper-Nickel alloy (CuNi), commonly known as Constantan. Type J thermocouples are known for their affordability, high sensitivity, and effective use in moderate temperature ranges, especially in environments free from oxidizing conditions.

Fe-CuNi Type J Thermocouple Wire is a cost-effective and reliable solution for moderate-temperature applications. Its high sensitivity, affordability, and stable performance make it a popular choice for industrial heating, temperature monitoring, and general-purpose uses in environments free of oxidizing or corrosive conditions.

color codes of thermocouple ( J type )

Thermocouple temperature range and tolerance

Key Features of Fe-CuNi Type J Thermocouple Wire:

• Temperature Range

Effective in temperatures ranging from -210°C to 760°C (-346°F to 1400°F), making it suitable for low-to-moderate temperature applications.

• High Sensitivity

Produces a thermoelectric voltage of approximately 55 µV/°C at 0°C, ensuring accurate temperature readings.

• Material Composition

Positive Leg (Fe): Made of pure iron for consistent performance.

Negative Leg (CuNi/Constantan): Approximately 55% Copper and 45% Nickel.

• Electrical Properties

Provides stable and reliable thermoelectric output within its operating range.

• Cost-Effective

Economical compared to other thermocouple types, making it ideal for general-purpose applications.

• Corrosion Resistance

Resistant to oxidation in reducing or vacuum environments.

Not suitable for oxidizing environments at high temperatures, as iron is prone to rapid oxidation.

• Applications

Widely used in industrial heating processes, kilns, and furnaces.

Common in applications such as temperature monitoring in oil and gas, chemical processing, and power generation.

• Cable Options

Available in bare wire, insulated wire, or cable forms with various insulation materials such as fiberglass, Teflon, or ceramic.

Shielded cables are available for use in electrically noisy environments.

Advantages of Type J Thermocouple Wire:

• High sensitivity provides accurate readings within its temperature range.
• Cost-effective option for general-purpose use.
• Performs well in reducing or vacuum environments.

Limitations:

• Not recommended for use in oxidizing or high-humidity environments, as the iron leg corrodes quickly.
• Limited upper temperature range compared to other types, such as Type K.
• Magnetic properties of the iron leg can cause issues in certain applications.

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.