Type T Bare Wire
Copper / Constantan
Solid single-strand thermocouple wire. φ0.025mm ultra-fine to φ5.0mm standard. Bright or oxidized finish.
Type T Bare Wire: φ0.025mm – φ5.0mm, −200°C to +350°C, IEC 60584-1 Class 1
- Ø range
- φ0.025mm – φ5.0mm
- Temp
- −200°C to +350°C
- EMF tol.
- ±0.5°C (−40–125°C) / ±0.4% (125–350°C)
- Testing
- 100%
Technical Specifications
Type T Bare Wire — Copper / Constantan at −200°C to +350°C, solid single strand from φ0.025mm – φ5.0mm, supplied to IEC 60584-1 Class 1.
| Property | Specification |
|---|---|
| Positive Leg | Copper (Cu 99.9%) |
| Negative Leg | Constantan (CuNi 55/45) |
| Temperature Range | −200°C to +350°C |
| Diameter Range | φ0.025mm – φ5.0mm |
| Diameter Tolerance | ±0.005mm (fine) / ±0.02mm (standard) |
| EMF Tolerance | ±0.5°C (−40–125°C) / ±0.4% (125–350°C) |
| Standards | IEC 60584-1 Class 1 / ASTM E230 / DIN EN 60584 |
| Surface Finish | Bright / Oxidized / Electro-polished |
| Condition | Hard (cold-drawn) / Soft (annealed) / Bright finished |
| Packaging | DIN 125 spool / Coil / Custom reel |
| Coil Weight | 5kg / 10kg / 20kg standard |
| Testing & Traceability | 100% eddy-current + resistance + dimensional · MTC · EMF calibration certificate · Furnace batch traceability |
How to specify Type T Bare Wire
- Confirm the alloy for your operating temperature — Copper / Constantan, rated −200°C to +350°C in air.
- Pick the conductor diameter from φ0.025mm – φ5.0mm (diameter tolerance ±0.005mm (fine) / ±0.02mm (standard)) — solid single-strand Copper / Constantan at the ultra-fine end of the −200°C to +350°C range.
- Choose the temper condition for this T · Copper / Constantan wire — Hard (cold-drawn) / Soft (annealed) / Bright finished. The temper is chosen for the solid T sensing element held in the furnace or panel.
- Choose the surface finish for T · Copper / Constantan — Bright / Oxidized / Electro-polished. Finish is selected for the atmosphere the T element will sit in.
- Choose the packaging — DIN 125 spool / Coil / Custom reel, standard coil weights 5kg / 10kg / 20kg standard. Spooled to protect the T solid conductor in transit and handling.
- Quote Type T Bare Wire against IEC 60584-1 Class 1 and request the MTC / EMF calibration certificate with the batch number for traceability.
Which thermocouple type fits the job
These are the T-type ranges as they apply to the solid single-strand form described on this page. Confirm the type first, then pick the conductor diameter.
| Type | Alloy | Range | EMF tolerance |
|---|---|---|---|
| N | Nicrosil / Nisil | −270 … +1300 °C | ±1.5°C (0–375°C) / ±0.4% (375–1000°C) |
| T this page | Copper / Constantan | −200 … +350 °C | ±0.5°C (−40–125°C) / ±0.4% (125–350°C) |
| E | Chromel / Constantan | −200 … +900 °C | ±1.5°C (0–275°C) / ±0.4% (275–900°C) |
Verification & quality evidence
- IEC 60584-1 Class 1 / ASTM E230 / DIN EN 60584
- 100% eddy-current + resistance + dimensional · MTC · EMF calibration certificate · Furnace batch traceability
- Third-party testimonials and site references are being collected for this product line — ask for Type T Bare Wire reference contacts in comparable static installations when you request a quote.
Frequently Asked Questions
Why is Type T chosen for cryogenic measurement?
It is the most accurate base-metal type below zero at ±0.5 °C, with excellent corrosion resistance in moist environments.
What is the maximum temperature for Type T?
+350 °C. The copper positive leg oxidises above that, so despite the −200 °C to +350 °C range, Type T is fundamentally a low-temperature thermocouple.
What diameters does Type T bare wire come in?
φ0.025 mm to φ5.0 mm, supplied to IEC 60584-1 Class 1 / ASTM E230 with MTC and furnace batch traceability.
Bottom line: Type T Bare Wire (Copper / Constantan) covers −200°C to +350°C across φ0.025mm – φ5.0mm, with EMF tolerance ±0.5°C (−40–125°C) / ±0.4% (125–350°C). Supplied to IEC 60584-1 Class 1 with 100% EMF testing, MTC and furnace batch traceability.