NiCr-NiSi Type K Extension Wire for High-Temperature Durability and Corrosion Resistance in Industrial Applications

NiCr-NiSi Thermocouple Wire refers to a type of thermocouple composed of two different metal alloys: Nickel-Chromium (NiCr) and Nickel-Silicon (NiSi). This combination is used in temperature sensing applications, typically in industrial processes, furnaces, and scientific instruments.

• Nickel-Chromium (NiCr): This is the positive leg (or the "hot" leg) of the thermocouple. It is made from an alloy of nickel and chromium and is chosen for its ability to withstand high temperatures and maintain a stable and repeatable electrical signal in response to temperature variations.

• Nickel-Silicon (NiSi): This forms the negative leg (or "cold" leg) of the thermocouple. It is a nickel-based alloy with added silicon, offering resistance to oxidation at high temperatures and contributing to the stability of the thermoelectric output.

The combination of these two materials creates a Type K thermocouple (in the standard thermocouple classification), which is one of the most commonly used types due to its wide temperature range and reliability.

Color codes of thermocouple wire (K type)

Positive wire is yellow, negative wire is red.

Some key features include:

• Voltage Output: The NiCr-NiSi thermocouple produces a voltage (mV) output that varies with temperature. This output can be measured and converted into a temperature reading. The thermoelectric voltage generated is the result of the Seebeck effect, where a temperature difference between the two junctions of the dissimilar metals creates a small electrical potential.
• Temperature Range: NiCr-NiSi thermocouples can typically measure temperatures in the range of -200°C to +1372°C (-328°F to 2502°F). The specific temperature limits depend on the exact alloy composition and the type of insulation used in the wire.
• Accuracy: These thermocouples offer good accuracy in the mid-range temperatures but may become less accurate at extreme ends of the temperature scale (both low and high). However, Type K thermocouples are generally known for their moderate accuracy and wide temperature range, making them a versatile choice for many applications.
• Response Time: NiCr-NiSi thermocouples typically have a relatively quick response time, allowing them to rapidly detect and respond to changes in temperature. This makes them suitable for applications requiring real-time monitoring and control.

Applications:

• Industrial Furnaces and Kilns: For controlling and monitoring temperatures in high-temperature environments.
• Combustion Chambers: To measure the temperature of gases or materials exposed to flames or high heat.
• Scientific Laboratories: Where precise temperature measurements are required for experiments or equipment calibration.
• Ovens and Heaters: For accurate temperature control in manufacturing and processing applications.
• Exhaust Systems: In automotive or power generation industries, where monitoring exhaust temperatures is critical.

Thermocouple temperature range and tolerance

Advantages

• Wide Temperature Range: Type K thermocouples, including NiCr-NiSi, offer a broad operational temperature range, making them suitable for both low and high-temperature applications.
• Cost-Effective: NiCr-NiSi thermocouples are relatively inexpensive compared to other high-accuracy sensors, such as platinum-based thermocouples or resistance temperature detectors (RTDs).
• Good Stability: The combination of nickel-chromium and nickel-silicon provides a stable thermoelectric voltage, which translates into reliable temperature readings over time.
• Resistance to Oxidation: Both NiCr and NiSi alloys have good resistance to oxidation at high temperatures, which ensures durability and a longer lifespan in high-temperature environments.

Comparison to Other Thermocouple Types

• Type K (NiCr-NiSi): Most common, offering a broad temperature range and moderate accuracy. They are more affordable but less accurate than some other thermocouple types.
• Type J (Fe-CuNi): An older type that is less commonly used than Type K but can offer good performance at lower temperatures. However, Type K thermocouples are generally preferred for high temperatures.
• Type N (NiCrSi-NiSi): A more stable alternative to Type K, with improved resistance to oxidation and better long-term stability, but typically more expensive.

Temperature-Voltage Relationship

Thermocouple manufacturers and standards bodies, such as the NIST (National Institute of Standards and Technology) or IEC (International Electrotechnical Commission), publish voltage-to-temperature conversion tables or equations for Type K thermocouples. The voltage generated by a NiCr-NiSi thermocouple is directly related to the temperature difference between the measuring junction and the reference junction. Calibration is typically necessary for precise measurements.

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.