Type K Thermocouple Mineral Insulated (MI) Cable – 3.0mm Diameter,
SS316 Sheath
Product Overview
This Type K mineral insulated (MI) thermocouple cable from Huona is
a robust, fully enclosed temperature sensing solution, engineered
for high-temperature, high-pressure, and vibration-intensive
industrial environments. Constructed with a Type K thermocouple
core (KP/KN Chromel/Alumel), high-purity magnesium oxide
insulation, and a durable 316 stainless steel sheath, this cable
offers unparalleled mechanical strength, chemical resistance, and
long-term stability. Unlike bare thermocouple wires, the MI
construction protects the sensing element from contamination,
oxidation, and physical damage, making it ideal for demanding
applications in power generation, petrochemical, and metal
processing industries.
Core Specifications
- Product Name: Type K Mineral Insulated (MI) Thermocouple Cable
- Thermocouple Grade: Type K (KP Chromel / KN Alumel)
- Sheath Material: 316 Stainless Steel (SS316)
- Insulation Material: High-purity Magnesium Oxide (MgO)
- Standard Diameter: 3.0mm (customizable: 1.0–6.0mm)
- Core Configuration: 2-core (KP/KN)
- Standard Length: 100m/coil (custom cut lengths available)
- Tolerance: Diameter ±0.05mm
- Accuracy Class: IEC Class 1 (±1.5°C or ±0.4% of reading, whichever
is greater)
- Continuous Operating Temperature: -200°C ~ 1100°C (SS316 sheath)
- Maximum Short-Term Temperature: 1150°C
- Standards Compliance: IEC 60584-1, ASTM E230, GB/T 30427, RoHS 2.0
Key Differentiating Advantages
1. Rugged, Contamination-Resistant Construction
The hermetically sealed SS316 sheath and high-purity MgO insulation
create a barrier against moisture, gases, and corrosive
environments. This eliminates the risk of thermocouple drift caused
by contamination, ensuring consistent, accurate readings even in
harsh industrial conditions.
2. Excellent Mechanical Strength & Flexibility
The stainless steel sheath provides exceptional tensile strength,
crush resistance, and vibration tolerance, making the cable
suitable for installation in high-vibration equipment, furnaces,
and pipelines. It also offers good flexibility, allowing for easy
bending and forming around complex geometries.
3. Stable Performance at High Temperatures
The MI construction prevents oxidation of the thermocouple wires,
extending service life compared to bare wires at temperatures above
800°C. The MgO insulation maintains its dielectric strength at high
temperatures, ensuring reliable electrical isolation between the
thermocouple core and the sheath.
4. Versatile Sheath Material Options
While this standard grade uses SS316, we also offer optional sheath
materials such as Inconel 600 or 310S for higher temperature (up to
1260°C) or more corrosive environments, providing tailored
solutions for specific application requirements.
5. Simplified Probe Fabrication
The cable can be easily cut, bent, and terminated on-site to create
custom thermocouple probes with various junction types (grounded,
ungrounded, exposed), making it highly versatile for different
installation needs.
Technical Specifications Table
| Attribute | Typical Specification |
|---|
| Thermocouple Type | Type K (KP/KN) |
| Sheath Material | 316 Stainless Steel |
| Insulation Material | Magnesium Oxide (MgO) |
| Standard Diameter | 3.0mm (±0.05mm) |
| Core Configuration | 2-core |
| Standard Length | 100m/coil |
| Accuracy Class | IEC Class 1 |
| Continuous Operating Temp | -200°C ~ 1100°C |
| Dielectric Strength | ≥500V DC (room temperature) |
| Insulation Resistance | ≥1000 MΩ·cm (room temperature) |
| Bending Radius | 5x cable diameter |
Supply & Packaging Standard
- Supply Form: Continuous coils of MI thermocouple cable, available
in standard lengths or custom cut-to-size pieces
- Packaging: Coils are protected with anti-rust paper and sealed in
moisture-proof plastic packaging, suitable for export
- MOQ: 1 coil (sample order); bulk quantities available for
industrial OEMs
- Customization: Diameter, length, sheath material (SS316/Inconel
600/310S), and core configuration (2/4-core) available upon request
Typical Application Scenarios
- Power Generation: Boiler, turbine, and exhaust gas temperature
monitoring in coal-fired and gas-fired power plants.
- Petrochemical & Refining: Temperature measurement in reactors,
furnaces, and pipelines handling corrosive fluids.
- Metal Processing: High-temperature sensing in steel reheating
furnaces, annealing ovens, and continuous casting lines.
- HVAC & Building Automation: Temperature control in industrial
ovens, kilns, and process heating equipment.
- Aerospace & Defense: Thermal testing and monitoring in
high-temperature engine components and industrial furnaces.
