Type B thermocouple wire
Type B bare thermocouple wire is a platinum-rhodium thermocouple wire consisting of Pt30%Rh and Pt6%Rh conductors. It is designed for very high-temperature measurement and can be used in oxidising and inert atmospheres. Type B should not be used in reducing atmospheres. Kamet supplies Type B wire with a calibration certificate in a range of diameters for high-temperature industrial applications.
Type B thermocouple wire specifications
| Specification | Type B bare thermocouple wire |
|---|---|
| Thermocouple type | Type B |
| Conductor combination | Pt30%Rh-Pt6%Rh* |
| Positive leg | BP – 70% Pt / 30% Rh |
| Negative leg | BN – verify full composition |
| Long-term maximum | 1300°C claim |
| Short-term maximum | 1600/1700°C |
| IEC 60584 tolerance | Class 2 |
| Available diameters | 0.045 vs 0.10–1.0 mm |
| Certificate | Calibration certificate |
| Suitable atmospheres | Oxidising and inert |
| Unsuitable atmosphere | Reducing |
| Delivery time | 3 weeks for listed diameters |
Our standard type B wire
Please contact us if you need different diameters. We can supply more custom made diameters (combinations) than stated below.
Need a complete Type B high-temperature thermocouple?
Type B wire can also be supplied as part of a complete high-temperature thermocouple assembly. View Kamet’s high-temperature thermocouple solutions for available configurations and customisation options.
| Thermocouple | Class | Outside Diameter in mm | Delivery time | |
|---|---|---|---|---|
| Type B | Class 2 | 0.045 mm | 3 weeks | Send inquiry |
| Type B | Class 2 | 0.20 mm | 3 weeks | Send inquiry |
| Type B | Class 2 | 0.30 mm | 3 weeks | Send inquiry |
| Type B | Class 2 | 0.35 mm | 3 weeks | Send inquiry |
| Type B | Class 2 | 0.40 mm | 3 weeks | Send inquiry |
| Type B | Class 2 | 0.50 mm | 3 weeks | Send inquiry |
| Type B | Class 2 | 0.80 mm | 3 weeks | Send inquiry |
Delivery times stated are workingsdays with delivery to Kamet’s warehouse
How can we help you today?
Request a quotation for the wire and quantity you need for your project.
Environment and industrial usage
These thermocouples are ideally used in clean air or oxidising environments and are not recommended for reduction atmospheres. Thanks to the increased amount of rhodium in Type B thermocouples, they experience reduced grain growth, which allows for a slightly higher temperature range compared to types R and S.
Type B thermocouples are utilized in a variety of high-temperature industrial settings. They are particularly useful in cement processes and incinerators, as well as other high-temperature industries. These thermocouples are adept at measuring hot gas temperatures and are suitable for inert and oxidising applications, showcasing their versatility and reliability in challenging environments.
The type B thermocouple wire can also be used in MI thermocouple cable. More about MI cable with type B thermocouple.
Specifications and physical properties
Operating temperature
Please note that the ranges are given as indicative values and vary per diameter.
- Maximum long term continuous operating temperature: up to 1300°C
- Short term use: up to 1600°C
What is Type B thermocouple wire made of?
Type B thermocouple wire uses platinum-rhodium alloys for both thermocouple legs. The positive BP leg contains 70% platinum and 30% rhodium, while the BN composition is [validated composition].
- BP ( + ) = 70%Pt 30%Rh
- BN (-) = 94%Pt 6%Rh
Physical properties
| BN | BP | |
|---|---|---|
| Density (g/cm3) | 21.45 | 17.6 |
| Melting point (°C) | 1771 | 1945 |
| Resistivity at 0 °C (μΩ*cm) | 9.81 | 18 |
| Tensile strength(Mpa) | 156.8 | 480.2 |
| Coefficient of heat conductivity(W/M*K) | 71 | 30 |
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 J
Fe-CuNi bare wire -210°C to +750°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