J型热电偶 Thermocouple type-J

        该J型热电偶由铁（Fe+）和康铜（CuNi-，铜-镍合金）组成，属于常用热电偶。其测温范围大约为 -40℃ 至 +750℃，在低温到中温范围内具有良好的测量精度和稳定性。由于铁质材料容易氧化，J型热电偶不适合在高湿度或强氧化、强腐蚀环境中长期使用。

This Type J Thermocouple is composed of iron (+) and constantan (-, copper-nickel alloy). It is one of the most common thermocouples. The typical temperature measurement range is -40 °C to +750 °C, providing good accuracy and stability in low to medium temperature ranges. However, due to iron oxidation, it is not recommended for long-term use in high humidity, highly oxidizing, or corrosive environments.