Type K Thermocouple Bare Wire (KP/KN) – 2.0mm Diameter Heavy-Duty
Grade
Product Overview
This heavy-gauge Type K thermocouple bare wire from Huona is a
robust, industrial-grade thermoelectric pair, purpose-built for
long-term, continuous high-temperature monitoring. Composed of KP
(Chromel, positive leg) and KN (Alumel, negative leg), this thick
wire is engineered to resist oxidation, thermal fatigue, and
mechanical stress in the harshest industrial environments. Unlike
finer gauges, its substantial cross-section drastically slows the
aging process, ensuring stable readings and extended service life
in demanding applications.
Core Specifications
- Product Name: Type K Thermocouple Bare Wire (KP/KN Pair,
Heavy-Duty)
- Alloy Composition:
- KP (Positive Leg): Chromel (Ni: ~90%, Cr: ~10%)
- KN (Negative Leg): Alumel (Ni: ~95%, Al: ~2%, Mn: ~2%, Si: ~1%)
- Diameter: 2.0mm (customizable: 1.5–4.0mm)
- Tolerance: ±0.02mm
- Form: Coil (standard length: 50m/leg; custom lengths available)
- Thermoelectric Performance:
- Accuracy Class: IEC Class 1 (±1.5°C or ±0.4% of reading, whichever
is greater)
- Thermoelectric Power: ~40.5 µV/°C at 100°C
- Operating Temperature Range: -200°C ~ 1260°C (continuous use;
optimized for 800–1200°C long-term service)
- Standards Compliance: IEC 60584-1, ASTM E230, GB/T 4989, RoHS 2.0
- Manufacturer: Huona (Shanghai) New Material Co., Ltd.
Key Differentiating Advantages
1. Drastically Extended Service Life in Oxidizing Environments
The 2.0mm diameter provides a much larger volume of material,
significantly slowing down oxidation and the infamous "green rot"
degradation common in K-type wires above 800°C. This translates to
2–3 times longer service life compared to 0.5–1.0mm wires in the
same conditions, reducing costly downtime and replacements.
2. Superior Mechanical Strength & Vibration Resistance
With a high tensile strength and robust cross-section, this wire is
virtually immune to sagging, stretching, and breakage in vertical
furnace installations or high-vibration environments like gas
turbines and cement kilns. It eliminates the "wire fatigue" issues
that plague finer gauges.
3. Minimal Drift & Ultra-Stable Long-Term Readings
The larger material volume acts as a buffer against contamination
and grain structure changes, resulting in minimal thermoelectric
drift. This ensures process control remains accurate and consistent
over thousands of operating hours, critical for maintaining product
quality.
4. Versatile for Rugged Probe Assembly
The thick diameter is ideal for constructing heavy-duty,
high-temperature thermocouple probes. It provides ample material
for robust weld junctions and is perfectly suited for use with
large ceramic or metal protection tubes, making it a go-to for
industrial OEMs.
5. Cost-Effective for Continuous Processes
While the upfront cost is higher than fine wire, the extended
lifespan and reduced maintenance frequency make this heavy-duty
grade far more economical for 24/7 operations in power plants,
steel mills, and chemical facilities.
Technical Specifications Table
| Attribute | Value (Typical) |
|---|
| Alloy Grade | KP (Chromel) / KN (Alumel) |
| Diameter | 2.0mm (±0.02mm) |
| Form | Coil |
| Accuracy Class | IEC Class 1 |
| Operating Temperature | -200°C ~ 1260°C (continuous) |
| Tensile Strength | ≥700 MPa (KP/KN) |
| Elongation | ≥20% |
| Surface Finish | Dark, pre-oxidized finish (optimized for high-temperature use) |
| Packaging | Moisture-proof, anti-oxidation coil packaging |
Typical Applications
- Steel & Metal Processing: Continuous monitoring in reheating
furnaces, annealing ovens, and sintering plants.
- Power Generation: Boiler, superheater, and exhaust gas temperature
monitoring in coal-fired and gas-fired power stations.
- Cement & Kiln Operations: High-temperature sensing in rotary
kilns and clinker coolers.
- Petrochemical Refining: Process heater and reformer temperature
control in harsh environments.
- Heavy Industrial OEM: Core material for manufacturing robust,
long-life thermocouple probes for industrial machinery.
