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

Fe-CuNi Type J Thermocouple Wire is a widely used temperature sensing element made from a positive leg of pure iron (Fe) and a negative leg of Copper-Nickel alloy (CuNi), also known as Constantan. Type J thermocouples are particularly valued for their high sensitivity, affordability, and reliability, making them ideal for various industrial and scientific applications.

Fe-CuNi Type J Thermocouple Wire is an affordable and reliable temperature-sensing solution for moderate-temperature applications. Known for its high sensitivity and good performance in reducing or inert atmospheres, it is widely used in industrial heating, chemical processing, and general-purpose temperature monitoring. However, it has limitations in high-oxidizing conditions and at very high temperatures, where its performance may degrade due to the oxidation of the iron leg.

color codes of thermocouple ( J type )

Thermocouple temperature range and tolerance

Key Features of Fe-CuNi Type J Thermocouple Wire:

• Temperature Range

-210°C to 760°C (-346°F to 1400°F).

Ideal for low- to moderate-temperature measurements.

• High Sensitivity

Type J thermocouples are highly sensitive with a thermoelectric voltage of approximately 55 µV/°C at 0°C, making them suitable for precise temperature measurement.

• Material Composition

Positive Leg (Fe): Pure iron, offering good thermal conductivity but prone to oxidation at higher temperatures.

Negative Leg (CuNi/Constantan): A copper-nickel alloy, typically 55% copper and 45% nickel, which provides excellent stability and resistance to corrosion.

• Electrical Properties

High output and stable voltage within the temperature range, ensuring reliable and consistent readings.

• Corrosion Resistance

Iron Leg: Resistant to oxidation in reducing and vacuum environments but prone to rapid oxidation in high-oxygen or oxidizing conditions at higher temperatures.

Copper-Nickel Leg: More resistant to oxidation, though the alloy can degrade in extremely high-temperature oxidizing conditions.

• Cost-Effective

Type J thermocouples are generally less expensive than other thermocouple types, such as Type K, making them an economical choice for applications with moderate temperature ranges.

• Magnetic Properties

The iron leg of Type J is magnetic, which can be a consideration in some specific applications, such as when operating in magnetic fields or where non-magnetic materials are required.

Applications

• Industrial Heating: Widely used in furnaces, kilns, and ovens.
• Food Processing: Monitoring temperature in baking, cooking, and drying applications.
• Chemical Processing: Suitable for applications where temperatures do not exceed its limit in both reducing and inert environments.
• Oil & Gas: Used for temperature monitoring in reactors and pipelines.
• General Temperature Monitoring: In situations where high accuracy is required in moderate temperatures.

Cable Options

• Insulation Materials: Available in a variety of insulation options, including fiberglass, Teflon, and ceramic, for different environmental conditions.
• Shielded or Unshielded Cables: Shielded cables are often used to reduce electrical interference in noisy environments.

Advantages of Type J Thermocouple Wire:

• High Sensitivity: Excellent for precise temperature measurement due to its high voltage output.
• Affordable: Type J thermocouples are cost-effective, making them suitable for a wide range of applications.
• Reliable: Stable and accurate within its temperature range, suitable for most general-purpose applications.

Limitations:

• Oxidation Sensitivity: The pure iron leg is highly susceptible to oxidation at high temperatures and in oxygen-rich environments.
• Magnetic Properties: The iron leg’s magnetic nature may cause interference in some applications.
• Limited High-Temperature Range: Not suitable for temperatures above 760°C, making it less appropriate for extremely high-temperature applications compared to other types (e.g., Type K).

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.