Type E Thermocouple Wire: Chromel / Constantan, −200 … +900 °C
Chromel (NiCr 90/10)
Constantan (CuNi 55/45)
±1.5°C (0–275°C) / ±0.4% (275–900°C)
Highest EMF output per degree (68 µV/°C) — best sensitivity among base metal thermocouples. Non-magnetic.
Limited high-temperature range compared to Type K/N. Not as widely adopted.
Technical Specifications
| Property | Specification |
|---|---|
| Diameter Range | φ0.025mm – φ5.0mm |
| Tolerance | ±0.005mm (fine) / ±0.02mm (standard) |
| Temperature Range | −200 … +900 °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 E Thermocouple Wire
- Confirm the alloy for your operating temperature — Chromel / Constantan, rated −200 … +900 °C.
- Check the atmosphere before ordering — Limited high-temperature range compared to Type K/N. Not as widely adopted.
- Choose the product form — Bare Wire or Stranded Wire. For Type E Thermocouple Wire the deciding factor is the service condition: highest EMF output per degree (68 µV/°C) — best sensitivity among base metal thermocouples. Non-magnetic.
- 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 E Thermocouple Wire form you need so the certificate scope matches the delivered conductor.
Frequently Asked Questions
What is the sensitivity of Type E?
68 µV/°C — the highest EMF output per degree among base-metal thermocouples.
What temperature range does Type E cover?
−200 °C to +900 °C, narrower at the top than Type K or N but with the largest signal per degree.
Are Type E conductors magnetic?
No. Both legs are non-magnetic, which suits induction-heating and other magnetic-field environments.
When should Type E be preferred over Type K?
Where signal strength matters more than ceiling temperature — electrically noisy plant and cryogenic instrumentation.
Bottom line: Type E trades the top of the temperature range for signal: 68 µV/°C, the highest of any base-metal thermocouple, over −200 °C to +900 °C, with non-magnetic conductors. Choose it where the measurement environment is electrically noisy or the application is cryogenic, not where the ceiling temperature decides.