Reliable Type J Thermocouple Wire — Optimized for Mid-Range Temperature Measurement
Reliable Type J Thermocouple Wire — Optimized for Mid-Range Temperature Measurement
Chengxin Alloy offers precision-engineered Type J thermocouple wire, designed for accurate temperature sensing in industrial furnaces, heat treatment systems, and general-purpose thermal applications. Known for its high sensitivity, Type J is an economical and robust solution for temperature ranges between -40°C to +750°C.
Type J thermocouple wire consists of Iron (Fe) and Constantan (Cu-Ni) conductors, providing a strong and stable EMF signal in mid-range temperature environments. Chengxin Alloy ensures high quality through controlled alloy ratios, precise drawing, and strict insulation matching for reliable field performance.
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 | |||||
| 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 |
Key Features
- Accurate & Stable EMF Output
Complies with ANSI/ASTM E230 standards for high thermoelectric stability in demanding environments. - Economical & Widely Used
A cost-effective choice for equipment operating below 750°C, including ovens, kilns, and lab setups. - Multiple Insulation Options
Fiberglass: Heat resistant to 500°C
PVC: Economical and flexible
Teflon (PTFE): Ideal for corrosive or moist conditions
Silica fiber or Ceramic (available upon request)
- Available Gauges
From AWG 8 to AWG 30 (or 0.25mm – 3.2mm) with tight diameter tolerances.
Typical Applications
- Heat Treatment Furnaces & Industrial Ovens
- Lab Instruments for Material Testing
- Temperature Control in Automotive and Plastics Processing
- Construction Material Curing (e.g., asphalt, concrete monitoring)
- Fire Safety and Smoke Control Systems
Why Choose Chengxin Alloy?
- Factory-Direct Supply: Alloy production + precision drawing in one
- Full Traceability: Batch-coded and tested per IEC & ASTM standards
- Custom Options Available: Stranding, shielding, color coding, and more
- Fast Lead Time: From sample rolls to bulk orders
Chengxin Alloy provides high-quality Type J thermocouple wire and Type J thermocouple cable solutions tailored for industrial and laboratory temperature measurement needs. Our JX thermocouple wire—also known as Type JX extension wire—ensures accurate signal transmission between thermocouple probes and control systems. Constructed with an iron-positive leg and constantan-negative leg, J-type thermocouple wire is ideal for applications up to 750°C. Whether you're sourcing cable thermocouple Type J, Watlow-compatible thermocouple Type J, or simply looking for durable, corrosion-resistant Type J cable, Chengxin’s products deliver consistent performance. Available in bare wire or insulated formats, including kabel thermocouple Type J, our offerings meet ANSI and IEC standards for precision. With reliable Type J wire materials, tight tolerances, and full traceability, we’re ready to support your thermocouple assembly or OEM requirements.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.