Fe CuNi Type J Thermocouple Wire For Affordable And High-Sensitivity Temperature Sensing In Moderate Environments
Brand Name:Senphus
Certification:SGS, ISO9001
Model Number:type J
Minimum Order Quantity:5kg
Delivery Time:3 days
Payment Terms:T/T, D/P
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Changzhou Jiangsu China
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Building 3, No. 29, Beitanghe East Road, Qinglong Street, Tianning District, Changzhou City, Jiangsu Province
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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 )
| Name | JP | JN |
| Melting Range(℃) | 1402 | 1220 |
| Density(g/cm³) | 7.8 | 8.8 |
| Resistivity(μΩm20℃) | 12 | 49 |
| Resistance-temperture coefficient ×10-4/K(0℃-1200℃) | 95 | 0.5 |
| Tensile strength Rm N/mm² MPa | ≥240 | ≥390 |
| Elongation % | ≥20 | ≥25 |
Thermocouple temperature range and tolerance
Name | Usag Classification | Grade | Max. operating temperature(℃) | emperitre nres) | Tnlerene | Standard | |
Lang term | Short term | ||||||
Fe-CuNi (Type J) thermocouple bright wire | J | l | 600 | 750 | -40~750 | ±1.5℃ or ±0.4%t | GB/T4994 ISO 14125 |
| Ⅱ | -40~750 | ±2.5℃ or ±0.75%t | |||||
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).
Fe CuNi Type J Thermocouple Wire For Affordable And High-Sensitivity Temperature Sensing In Moderate Environments
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