Robust Industrial Thermocouple Probe Assembly (Type K/N) for High Temperature
Hongtai Assembly Industrial Thermocouples (WR Series) are the robust, fully constructed temperature sensors designed for heavy process industries, and extreme durability in temperatures ranging from -200°C up to 1600°C. Unlike compact “probes” or disposable sensors, this is a complete Thermocouple assembly type K / N system consisting of three distinct modular components: a rugged Connection Head, a durable Protection Tube (Sheath), and a replaceable Inner Sensing Element.
Designed for longevity in harsh environments like coal-fired boilers, metallurgy, and industrial kilns, our assembly design allows for easy maintenance. When a sensor burns out, you don’t need to replace the entire unit—simply open the head and replace the inner element, significantly reducing your MRO costs.
Key Technical Features & Benefits
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Modular “Head-Tube-Element” Design: The core advantage of this Industrial thermocouple probe is its maintainability. If the internal sensor fails, you don’t need to replace the expensive protection tube. Simply unscrew the head and swap the element.
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Extreme Temperature Range: From cryogenic -200°C applications to 1600°C blast furnaces, we offer specific calibrations including Base Metal (Type K, N, E, J) and Noble Metal (Type S, R, B).
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Heavy Duty Protection: Available with Ceramic protection tube thermocouple options (Corundum/High Alumina) for resistance to molten metal and corrosive gases, or stainless steel (SS316/310) for mechanical strength.
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High Temperature Thermocouple Sensor Accuracy: Manufactured to IEC 60584 Class 1 standards, ensuring precise process control for critical boiler and furnace operations.
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Heavy Duty Temperature Probe Construction: IP65/IP67 waterproof connection heads (Types KNE, KNC, KB, KD) protect the electrical terminals from harsh factory environments.
Technical Specifications (WR Series)
| Parameter | Specification | Options |
| Product Type | Industrial thermocouple probe (Assembly) | WRN (K), WRE (E), WRR (B), WRP (S) |
| Calibration | Type K, N, E, J, T | Type S, R, B (Noble Metal) |
| Temp Range | 0°C – 1200°C (Metal Sheath) | 0°C – 1600°C (Ceramic Sheath) |
| Sheath Material | SS304, SS316, SS310 (2520), Inconel 600 | Ceramic protection tube (C799 Corundum) |
| Probe Diameter | 12mm, 16mm, 20mm, 25mm | Custom Heavy Wall |
| Process Connection | Thread (M27x2, NPT), Flange (ANSI/DIN) | Fixed or Adjustable |
| Connection Head | Die-cast Aluminum (IP65) | Explosion Proof (dIIBT4) |
| Element Type | Simplex (2-wire) or Duplex (4-wire) | – |
The “Assembly” Advantage: Modular Construction
The core value of the Industrial thermocouple probe (Assembly Type) is its maintainability. The structure is standardized (WRN, WRE, WRP, WRR) and completely serviceable:
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1. Connection Head (The Housing): Available in Die-Cast Aluminum (IP65) or Explosion-Proof (dIIBT4) to protect terminals from dust and moisture.
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2. Protection Tube (The Shield): A wide selection of outer sheaths protects the sensor from the process. Options range from Stainless Steel for general use to Ceramic protection tube thermocouple (Corundum/High Alumina) for 1600°C molten metal or glass applications.
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3. Inner Element (The Core): The heart of the sensor. We use high-purity thermocouple wire housed in a ceramic insulator or an MI cable insert. This part is easily removed and replaced without unthreading the main protection tube from the pipe.
Deep Dive: Choosing the Right Protection Tube
Selecting the correct sheath for your Industrial thermocouple probe is critical for longevity.
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Stainless Steel (304/316): Ideal for general purpose up to 900°C. Food safe and corrosion-resistant.
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Inconel 600 / SS310: Required for heat treating furnaces up to 1150°C. Resists oxidation.
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Ceramic (Corundum/Alumina): The only choice for a High temperature thermocouple sensor operating above 1200°C. Corundum C799 is 99.7% Al2O3, offering superior resistance to chemical attack and sagging at 1600°C.
Applications in Industry
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Boiler & Power Generation: Monitoring flue gas and steam pipe temperatures.
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Metal Processing: Molten aluminum and steel temperature measurement using ceramic tubes.
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Incinerators: Waste-to-energy plant combustion control.
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Chemical Petrochemical: Reactors and distillation columns requiring Heavy duty temperature probe solutions.
FAQ
Q: Can I replace just the inner element?
A: Yes. This is the main benefit of the Assembly Industrial Thermocouple. We sell replacement inner elements (terminal blocks + wire + ceramic insulators) separately, saving you up to 70% on maintenance costs.
Q: What is the difference between Type K and Type N?
A: Thermocouple assembly type K is the industry standard (0-1200°C). However, Type N (Nicrosil-Nisil) offers better stability and resistance to oxidation at high temperatures (1000°C+), making it a superior upgrade for modern furnaces.
Q: How do I mount this probe?
A: Most industrial probes use a fixed thread (M27x2 is standard in China, 1/2″ NPT in the US) or a standard ANSI flange. We can machine any connection to fit your existing boiler ports.
(See our Mineral Insulated Cables for tighter spaces.
Learn more about Thermocouple Types on Wikipedia.)
