Available from stock
Type J bare thermocouple wire
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.
Our standard cable items with type J wire
Please contact us if you need different diameters. We can supply more custom made diameters (combinations) than stated below.
| Thermocouple | Class | Outside Diameter in mm | On Stock | |
|---|---|---|---|---|
| Type J | Class 1 | 0.30 mm | 5 week delivery time | Send inquiry |
| Type J | Class 1 | 0.80 mm | Yes | Send inquiry |
| Type J | Class 1 | 1.00 mm | Yes | Send inquiry |
| Type J | Class 1 | 1.50 mm | 5 week delivery time | Send inquiry |
| Type J | Class 1 | 2.00 mm | Yes | Send inquiry |
| Type J | Class 1 | 3.00 mm | 5 week delivery time | Send inquiry |
Delivery times stated are for delivery to Kamet’s warehouse
How can we help you today?
Request a quotation for the wire and quantity you need for your project.
High quality type J thermocouple bare wire
- Available in diameters ranging from 0.80 mm to 3.90 mm
- Provided in IEC 60584 Class 1
- Supplied with an 3.1 certificate and a calibration certificate
- Supplied with positive and negative leg
- A good choice for reducing or inert environments or in a vacuum with temperatures up to 750°C
Specifications and physical properties
Operating temperature
Approximate working temperature range;
- Continues: +20 to +700°C
- Short term: –180 to +750°C
Please note that these ranges are given as indicative values and vary per diameter.
Chemical composition
- JP ( + ) = 100% Fe
- JN (-) = 45%Ni 55% Cu
Physical properties
| JP | JN | |
|---|---|---|
| Density (g/cm3) | 7.86 | 8.90 |
| Melting point (°C) | 1535 | 1210 |
| Resistivity | 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 |
Environment and industrial usage
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.
The type J thermocouple wire can also be used in MI thermocouplecable. More about MI cable with type J thermocouple.
JP/JN EMF reference table (mV)
| °C | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| 0 | 0 | 0.507 | 1.019 | 1.536 | 2.058 | 2.585 | 3.115 | 3.649 | 4.186 | 4.725 | 5.268 |
| 100 | 5.268 | 5.812 | 6.359 | 6.907 | 7.547 | 8.008 | 8.56 | 9.113 | 9.667 | 10.222 | 10.777 |
| 200 | 10.777 | 11.332 | 11.887 | 12.442 | 12.998 | 13.553 | 14.108 | 14.663 | 15.217 | 15.771 | 16.325 |
| 300 | 16.325 | 16.879 | 17.432 | 17.984 | 18.537 | 19.089 | 19.64 | 20.192 | 20.743 | 21.295 | 21.846 |
| 400 | 21.846 | 22.397 | 22.949 | 23.501 | 24.054 | 24.607 | 25.161 | 25.716 | 26.272 | 26.829 | 27.388 |
| 500 | 27.388 | 27.949 | 28.511 | 29.075 | 29.642 | 30.21 | 30.782 | 31.356 | 31.933 | 32.513 | 33.096 |
| 600 | 33.096 | 33.683 | 34.273 | 34.867 | 35.464 | 36.066 | 36.671 | 37.28 | 37.893 | 38.51 | 39.13 |
| 700 | 39.13 | 39.754 | 40.382 | 41.013 | 41.647 | 42.283 | 42.922 | 43.563 | 44.207 | 44.852 | 45.498 |
| 800 | 45.498 | 46.144 | 46.79 | 47.434 | 48.076 | 48.716 | 49.354 | 49.989 | 50.62 | 51.249 | 51.875 |
Other products in this category
Type K
NiCr-Ni bare wire -270°C to +1260°C
Type N
NiCrSil-NiSil bare wire -270°C to +1260°C
Type E
NiCr-CuNi bare wire -270°C to +900°C
Type T
Cu-CuNi bare wire -270°C to +370°C
Type S
Pt10%Rh-Pt bare wire -50°C to +1600°C
Type R
Pt13%Rh-Pt bare wire -50°C to +1450°C
Type B
Pt30%Rh-Pt6%Rh bare wire 600°C to 1700°C