Thermocouple alloy conductors, specified to the micron.
Thermocouple alloy conductors are the two dissimilar-metal wires that turn a temperature difference into a measurable millivolt signal. RAS Thermal vacuum-melts the alloys, draws them to 0.025-5.0 mm and tests every batch, with full in-house control and traceability.
- Ø range
- 0.025-5.0 mm
- Types
- K N J T E
- Tolerance
- Class 1
- Testing
- 100%
Five standard types, plus custom melts
| Type | Alloy pair | Temperature range | Sensitivity | Typical use | |
|---|---|---|---|---|---|
| K | Chromel / Alumel | −200 … +1370 °C | 41 µV/°C | General purpose, oxidizing atmospheres | Spec |
| N | Nicrosil / Nisil | −270 … +1300 °C | 39 µV/°C | Superior drift resistance at high temp | Spec |
| J | Iron / Constantan | −40 … +750 °C | 55 µV/°C | Reducing / vacuum atmospheres | Spec |
| T | Copper / Constantan | −200 … +350 °C | 43 µV/°C | Cryogenic and moist environments | Spec |
| E | Chromel / Constantan | −200 … +900 °C | 68 µV/°C | Highest EMF output per degree | Spec |
| X | Custom Alloys | On request | - | Alloy development, sample melts, contract drawing | Spec |
Nine controlled operations, one furnace number
- 01
Alloy Melting
Vacuum melting
min 500 kg
- 02
Hot Rolling
Billet reduction to wire rod
Continuous mill · φ5.5mm
- 03
Cold Drawing
Multi-pass diameter reduction
Multi-block line · 13 passes
- 04
Intermediate Annealing
Controlled H2/N2 atmosphere
Strand anneal
- 05
Precision Drawing
Diamond die to φ0.025mm ultra-fine
Single-crystal diamond dies
- 06
Final Annealing
Bright anneal for EMF stability
Inline tension control
- 07
Surface Treatment
Bright / oxidized / electro-polished
Electro-polishing cell
- 08
100% Testing
Eddy current, resistance, dimensional
Laser micrometer
- 09
Packaging
DIN 125 / 160 / 250 / 355 spool / coil / custom reel
Automated spooling
Spools tested
Resistance uniformity and diameter tolerance on every spool.
Data archive
Test records retained and retrievable by batch number.
Furnace number
Every meter traceable to a single melt with full chemistry.
Standards
IEC 60584-1 · ASTM E230 · DIN EN 60584 · JIS C 1602 · GB/T 16839
Where our conductors run
Industrial Heat Treatment
Furnaces, kilns, carburizing, nitriding
Aerospace & Aviation
Engine testing, turbine monitoring, AMS 2750
Power Generation
Turbine monitoring, boiler tubes, nuclear sensing
Petrochemical
Reformer tubes, distillation, pipeline monitoring
Automotive
Exhaust gas, EV battery thermal management
Medical & Pharma
Autoclave validation, freeze-drying, sterilization
Send us your specification.
Diameter, type, tolerance class, quantity, we reply with price and lead time within one business day.
Frequently Asked Questions
What thermocouple types does RAS Thermal manufacture?
RAS Thermal manufactures Type K, Type N, Type J, Type T and Type E thermocouple conductors, bare wire, stranded wire, and alloy ingots/wire rods.
Which standards do your thermocouple wires comply with?
Products are manufactured to IEC 60584-1 and ASTM E230 tolerance classes under an ISO 9001:2015 quality system, and every batch is electrically tested before shipment.
What is the finest wire diameter you can draw?
Our wire drawing capability reaches a finest drawn diameter of 0.025 mm for fine-gauge thermocouple wire.
How do you assure batch-to-batch consistency?
Composition is controlled at the melt stage rather than by sorting finished wire. Every batch ships with composition, EMF calibration and dimensional records, archived for ten years.
Do you supply international buyers?
Yes. RAS Thermal serves buyers in more than 10 countries and supports RoHS / REACH compliance documentation plus third-party inspection (SGS & BV).