According to the structural forming mode, industrial thermocouples are mainly divided into two standard types: ordinary assembled thermocouples and armored thermocouples. These two structural forms cover almost all industrial conventional thermocouple products, with essential differences in composition structure, processing technology, mechanical performance and application scenarios. Accurate distinction between structural characteristics and performance differences is the key to scientific model selection in industrial engineering and foreign trade procurement, which can effectively avoid equipment mismatch and improve the stability and accuracy of industrial temperature measurement.
Ordinary assembled thermocouples adopt split assembled structure, which is composed of four core parts: thermal electrode, insulating tube, protective sleeve and junction box. Each component is processed independently and assembled and fixed during installation. The thermal electrode is the core temperature sensing component, responsible for inducing temperature changes and generating thermoelectric potential; the insulating tube isolates multiple groups of thermal electrodes to avoid short circuit and signal interference; the external protective sleeve bears mechanical protection and anti-corrosion and anti-oxidation functions; the junction box realizes wiring sealing and signal transmission. The split structure has the advantages of simple processing, low cost and convenient single component replacement, which is very suitable for conventional stable industrial scenarios.
Armored thermocouples adopt integrated integral forming technology, which is completely different from ordinary assembled products. It takes thermocouple wires, insulating materials and metal protective sleeves as the core raw materials, and forms a solid and integrated combined structure through professional integral stretching processing technology. There is no split assembly gap inside the armored thermocouple, and all components are closely combined into one, with compact structure, high overall rigidity and strong structural stability. This integrated processing technology fundamentally solves the problems of loose assembly, internal dust accumulation and poor shock resistance of ordinary thermocouples.
There are obvious differences in performance and application between the two structural types. Ordinary assembled thermocouples have low manufacturing cost, simple maintenance and convenient component replacement, and are suitable for open environment, stable working conditions and low vibration industrial scenarios such as conventional workshop production and ordinary equipment temperature monitoring. However, their split structure has poor overall sealing performance and weak anti-interference ability, and is not suitable for harsh environments such as high vibration, high pressure and severe corrosion.
Armored thermocouples have outstanding comprehensive performance advantages, with small volume, good flexibility, strong bending resistance and excellent shock and pressure resistance. The integrated fully sealed structure has good dust-proof, waterproof and anti-corrosion performance, and can adapt to narrow installation space, complex pipeline layout, high vibration and high-pressure harsh working conditions. Although the cost is slightly higher than ordinary thermocouples, it has longer service life and higher operation stability, and is more suitable for automated production lines, precision equipment, closed high-pressure equipment and high-end industrial scenarios, becoming the mainstream preferred product in high-standard industrial projects.
