Type C and D thermocouple wire
Type C and Type D are tungsten-rhenium bare thermocouple wires for ultra-high-temperature measurement. Type C uses W5Re/W26Re conductors, while Type D uses W3Re/W25Re conductors. Both are designed for temperature measurement up to 2871°C under the specified atmospheric conditions.
Type C and Type D thermocouple wire specifications
| Specification | Type C | Type D |
|---|---|---|
| Thermocouple type | Type C | Type D |
| Alloy combination | W5Re / W26Re | W3Re / W25Re |
| Material | Tungsten-Rhenium | Tungsten-Rhenium |
| Maximum stated measurement temperature | Up to 2871°C | Up to 2871°C |
| EMF testing | Up to 2300°C | Up to 2300°C |
| Standard | ASTM E230 Standard Limits | – |
| EMF inspection | Each finished wire size and each coil individually | Same |
| Traceability | NIST traceability stated | Same |
| Diameter range | Ø0.0127–1.0 mm, larger available | Same |
| Length | Standard/custom, no stated upper limit | Same |
| Typical delivery | 2–4 weeks / listed items 2 weeks | Same |
Our standard type C and D wire items
Please contact us if you need different diameters. We can supply more custom made diameters (combinations) than stated below.
Need a complete Type C or Type D high-temperature thermocouple?
Type C and D thermocouple wires are rather difficult to process into a sensor. Maybe a complete sensor will fit your needs better? Visit our high-temperature thermocouple page. On that page, complete assemblies are explained, and through the dedicated brochure, you can directly configure one.
| Thermocouple | Class | Outside Diameter in mm | Delivery time | |
|---|---|---|---|---|
| Type C Type D |
ASTM E 230 Standard limits | 0.076 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 0.127 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 0.198 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 0.254 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 0.381 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 0.30 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 0.50 mm | 2 weeks | Send inquiry |
| Type C Type D |
ASTM E 230 Standard limits | 1.00 mm | 2 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.
High quality type C and D thermocouple bare wire
Kamet offers a variety of high quality Type C and Type D thermocouple with two to four week delivery time. Our products offer the following advantages:
- EMF is tested at finished wire size and for each coil individually, not in batches
- EMF is tested up to 2300°C (4200 F)
- Full traceability and certification to NIST standards
- Certifications are user-friendly, with deviations indicated in mV, °F, or °C
- Wire sizes 0.0127 to 1 mm diameter and larger diameters are available.
- Type C and Type D wires are supplied at both standard and customised lengths with no upper limit.
- The thermocouple wires are doped which ensures superior ductility in comparison to un-doped materials.
- Extra services are available such as:
- Customised EMF tolerances and sizes for critical applications
- The recording of calibration data from both ends of long-length spools (end to end) instead of an average
What is the difference between Type C and Type D thermocouple wire?
Type C and Type D are both tungsten-rhenium thermocouples, but they use different alloy combinations. Type C uses W5Re/W26Re, while Type D uses W3Re/W25Re. According to the current product information, Type D has a marginally higher average EMF, while Type C is the more commonly used configuration. Type C is also identified as the ASTM-recognised tungsten thermocouple, whereas “Type D” is described as an industry designation.
Physical Properties of Tungsten Rhenium Alloys
Read here the mechanical and physical properties of the Tungsten Rhenium Alloy.
Industrial uses of Tungsten Rhenium thermocouples
Type C and Type D Tungsten Rhenium thermocouples are used for temperature measurement at extremely high temperatures, particularly in applications beyond the temperature capabilities of platinum-based thermocouples. Vacuum furnaces are one of the most common applications for these thermocouples.
Type C and Type D thermocouples are used in demanding high-temperature applications including:
- Vacuum furnaces
- Aerospace
- Power and solar energy
- Semiconductor processing and equipment
- Medical and scientific research
- Military applications
The suitability of Tungsten Rhenium thermocouples depends strongly on the operating atmosphere, particularly at elevated temperatures. Type C and Type D can be susceptible to embrittlement under certain atmospheric conditions. The atmosphere and maximum operating temperature should therefore be considered when selecting the appropriate thermocouple configuration.
Download the Type C and Type D datasheet
Consult the type C and D datasheet for more technical information. Fill out the form and you can download the datasheet immediately.
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