Type E Bare Wire
Chromel / Constantan
Solid single-strand thermocouple wire. φ0.025mm ultra-fine to φ5.0mm standard. Bright or oxidized finish.
Type E Bare Wire: φ0.025mm – φ5.0mm, −200°C to +900°C, IEC 60584-1 Class 1
- Ø range
- φ0.025mm – φ5.0mm
- Temp
- −200°C to +900°C
- EMF tol.
- ±1.5°C (0–275°C) / ±0.4% (275–900°C)
- Testing
- 100%
Technical Specifications
Type E Bare Wire — Chromel / Constantan at −200°C to +900°C, solid single strand from φ0.025mm – φ5.0mm, supplied to IEC 60584-1 Class 1.
| Property | Specification |
|---|---|
| Positive Leg | Chromel (NiCr 90/10) |
| Negative Leg | Constantan (CuNi 55/45) |
| Temperature Range | −200°C to +900°C |
| Diameter Range | φ0.025mm – φ5.0mm |
| Diameter Tolerance | ±0.005mm (fine) / ±0.02mm (standard) |
| EMF Tolerance | ±1.5°C (0–275°C) / ±0.4% (275–900°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 E Bare Wire
- Confirm the alloy for your operating temperature — Chromel / Constantan, rated −200°C to +900°C in air.
- Pick the conductor diameter from φ0.025mm – φ5.0mm (diameter tolerance ±0.005mm (fine) / ±0.02mm (standard)) — solid single-strand Chromel / Constantan at the ultra-fine end of the −200°C to +900°C range.
- Choose the temper condition for this E · Chromel / Constantan wire — Hard (cold-drawn) / Soft (annealed) / Bright finished. The temper is chosen for the solid E sensing element held in the furnace or panel.
- Choose the surface finish for E · Chromel / Constantan — Bright / Oxidized / Electro-polished. Finish is selected for the atmosphere the E element will sit in.
- Choose the packaging — DIN 125 spool / Coil / Custom reel, standard coil weights 5kg / 10kg / 20kg standard. Spooled to protect the E solid conductor in transit and handling.
- Quote Type E 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 E-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 |
|---|---|---|---|
| T | Copper / Constantan | −200 … +350 °C | ±0.5°C (−40–125°C) / ±0.4% (125–350°C) |
| E this page | Chromel / Constantan | −200 … +900 °C | ±1.5°C (0–275°C) / ±0.4% (275–900°C) |
| J | Iron / Constantan | −40 … +750 °C | ±1.5°C (0–275°C) / ±0.4% (275–750°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 E Bare Wire reference contacts in comparable static installations when you request a quote.
Frequently Asked Questions
What is the sensitivity of Type E?
68 µV/°C — the highest EMF output per degree of any base-metal thermocouple. Both legs are non-magnetic.
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.
When is Type E preferred over Type K?
Where signal strength matters more than ceiling temperature — electrically noisy plant and cryogenic instrumentation.
Bottom line: Type E Bare Wire (Chromel / Constantan) covers −200°C to +900°C across φ0.025mm – φ5.0mm, with EMF tolerance ±1.5°C (0–275°C) / ±0.4% (275–900°C). Supplied to IEC 60584-1 Class 1 with 100% EMF testing, MTC and furnace batch traceability.