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Armored Thermocouple With High Pressure Resistance Corrosion Resistant And Fast Response Speed
Armored thermocouple, also known as sheathed thermocouple, is a solid combination formed by thermocouple wire, high-density magnesium oxide insulating powder and metal protective sheath through one-piece drawing. It can be imagined as a "metal cable" with thermocouple wire wrapped inside.
The core advantages stem from the integrated armored structure:
Metal sheath: Made of materials such as 316 stainless steel and Inconel 600, providing mechanical protection and resistance to high pressure (up to 34 MPa) and corrosion.
Insulation material: Filled with high-purity magnesium oxide powder, maintaining excellent insulation performance at high temperatures (insulation resistance at room temperature ≥ 1000 MΩ).
Thermocouple wire: The type is selected based on the temperature measurement range (e.g., K type covers -200°C to 1372°C, B type up to 1700°C), and the measuring end is formed through precise welding.
Main Features
High mechanical strength and high pressure resistance: The one-piece structure can withstand extremely high pressure and strong impact and vibration, making it suitable for harsh working conditions.
Good flexibility and bendability: The small-diameter armored thermocouple is very soft and can be bent into the desired shape, facilitating installation in complex spaces.
Fast response speed: Due to the small diameter of the sheath and the good thermal conductivity of magnesium oxide, its thermal response time is much faster than that of thermocouples with assembled protective tubes.
Long service life: Excellent corrosion resistance and vibration resistance significantly extend its service life.
Diverse types and flexible installation: Multiple outer diameter sizes are available (e.g., from 0.5mm to 8mm), various terminal forms are provided, and the measurement end form can be selected, meeting various installation requirements.
Armored thermocouple vs. Assembled thermocouple
To better understand its advantages, it can be compared with the traditional "assembled" thermocouple:
Characteristics
Armored thermocouple
Assembled thermocouple
Structure
Integrated drawing, dense and solid
Thermocouple wire is inserted into a pre-made protective tube, with large internal gaps
Diameter
Can be made very thin (e.g., 1mm)
Usually thicker (e.g., above 6mm)
Flexibility
Good, can be bent
Poor, usually straight or at a fixed angle
Response speed
Fast
Slow
Pressure resistance / Vibration resistance
Excellent
General
Installation convenience
High, flexible, can be cut on-site
Low, requires specific installation positions to be reserved
Cost
Higher
Lower
Armored thermocouples, due to their outstanding performance, are widely used in almost all industrial fields:
Chemical and petroleum industries: Temperature measurement in reactors, pipelines, and storage tanks, capable of withstanding corrosion and high pressure.
Power and energy: Temperature monitoring in boilers, steam pipes, and gas turbines.
Metallurgical industry: Temperature control in furnaces, steel ladles, and heat treatment furnaces.
Machinery manufacturing: Temperature measurement in plastic injection machines, extruders, and hot presses.
Aerospace: Temperature sensing in engines and test equipment.
Laboratory research: Various experimental devices requiring fast response and small-sized sensors.
Armored thermocouples are a high-performance, engineered upgrade of traditional thermocouples. By integrating thermocouple wires, insulating materials, and metal sheaths into a sturdy, slender, and flexible unit, they address many core difficulty of standard thermocouples in terms of mechanical protection, pressure resistance, vibration resistance, and ease of installation.