Type T Thermocouple Wire: Copper / Constantan, −200 … +350 °C
Copper (Cu 99.9%)
Constantan (CuNi 55/45)
±0.5°C (−40–125°C) / ±0.4% (125–350°C)
Best accuracy in sub-zero range (±0.5°C). Excellent corrosion resistance. Preferred for cryogenic and pharmaceutical applications.
Copper leg oxidises above 350°C. Limited upper temperature range.
Technical Specifications
| Property | Specification |
|---|---|
| Diameter Range | φ0.025mm – φ5.0mm |
| Tolerance | ±0.005mm (fine) / ±0.02mm (standard) |
| Temperature Range | −200 … +350 °C |
| Standards | IEC 60584-1 Class 1 / ASTM E230 / DIN EN 60584 |
| Surface Finish | Bright / Oxidised / Electro-polished |
| Packaging | DIN 125 spool / Coil / Custom reel |
| Coil Weight | 5kg / 10kg / 20kg standard |
| Traceability | Furnace batch number engraved on spool |
Available Product Forms
Bare Wire →
Solid single-strand, φ0.025–5.0 mm, bright or oxidised.
Stranded Wire →
Multi-strand for flexibility and vibration resistance. 7/19/37 strand.
How to specify Type T Thermocouple Wire
- Confirm the alloy for your operating temperature — Copper / Constantan, rated −200 … +350 °C.
- Check the atmosphere before ordering — Copper leg oxidises above 350°C. Limited upper temperature range.
- Choose the product form — Bare Wire or Stranded Wire. For Type T Thermocouple Wire the deciding factor is the service condition: best accuracy in sub-zero range (±0.5°C). Excellent corrosion resistance. Preferred for cryogenic and pharmaceutical applications.
- Fix the conductor diameter within φ0.025mm – φ5.0mm (±0.005mm (fine) / ±0.02mm (standard)).
- Quote against IEC 60584-1 Class 1 and request the MTC / EMF calibration certificate with the furnace batch number — state which Type T Thermocouple Wire form you need so the certificate scope matches the delivered conductor.
Frequently Asked Questions
Why is Type T used for cryogenic measurement?
It is the most accurate base-metal thermocouple below zero at ±0.5 °C, with excellent corrosion resistance in moist environments.
What is the temperature range of Type T?
−200 °C to +350 °C. The copper positive leg oxidises above 350 °C, which is why the type is used for low-temperature rather than furnace service.
Which industries specify Type T?
Cryogenics, pharmaceutical autoclave validation and clean-room instrumentation — anywhere sub-zero accuracy and corrosion resistance matter.
What tolerance does Type T hold?
±0.5 °C, the tightest of the base-metal types, supplied to IEC 60584-1 Class 1 / ASTM E230.
Bottom line: Type T is the accuracy choice at the cold end: ±0.5 °C below zero over a −200 °C to +350 °C range, with good corrosion resistance in moist service. It is not a furnace type — the copper leg oxidises above 350 °C.