Type J, Fe-CuNi thermocouple is a widely used thermocouple junction. In general, it is economically priced and it has a smaller temperature range compared to other thermocouple junctions: -210°C to +750°C. Type J thermocouples are favored for their low cost and high EMF, making them suitable for industrial applications.
These thermocouple wires feature iron-constantan conductors but have a slightly smaller temperature range compared to type K thermocouples and are not ideal for oxidizing environments. Caution is advised as the iron leg can rust if exposed to moisture.
|Thermocouple||Class||Outside Diameter in mm||On Stock|
|Type J wire||Class 1||0.30 mm||5 week delivery time||Send inquiry|
|Type J wire||Class 1||0.80 mm||5 week delivery time||Send inquiry|
|Type J wire||Class 1||0.80 mm||Yes||Send inquiry|
|Type J wire||Class 1||1.00 mm||Yes||Send inquiry|
|Type J wire||Class 1||1.50 mm||5 week delivery time||Send inquiry|
|Type J wire||Class 1||2.00 mm||Yes||Send inquiry|
|Type J wire||Class 1||3.00 mm||5 week delivery time||Send inquiry|
Please contact us if you need different diameters. We can supply more custom made diameters (combinations) than stated above.
Approximate working temperature tange;
Please note that these ranges are given as indicative values and vary per diameter.
|JP ( + )||100||–||–|
|Melting point (°C)||1535||1210|
|Temp. coef. of resistance (x10-6/°C)||5000||60|
|Linear expansion (coef. x10-6/°C)||11.7||14|
|Thermal Conductivity (W m-1 °C-1 at 20°C)||66.2||21.2|
Type J thermocouples are versatile instruments primarily used for temperature monitoring in various applications. They are particularly suitable for vacuum environments, for monitoring inert metals and non-reactive materials such as sand, concrete, and asbestos-containing materials. These thermocouples excel in high-temperature processes, including the manufacturing of plastics and resins.
However, they are not recommended for use in sulphurous atmospheres above 500°C or in oxidizing atmospheres at high temperatures due to the risk rust.
Do you have any further questions? Please let us know and our specialists will be happy to advise you.