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What is an armored thermocouple sensors?
Armoured thermocouples are used as temperature measurement sensors and are usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system. It is used to directly measure or control the temperature of fluid, steam, gas medium and solid surface in the range of 0-1800℃ in various production processes. Armored thermocouples sensors have many advantages such as flexibility, high pressure resistance, fast thermal response time, sturdiness and durability. It is the same as an industrial assembled thermocouple, and is usually used in conjunction with display instruments, 録音機器と電子調整器.

Thermocouples sensor used internationally have a standard specification. It is stipulated that the thermocouple is divided into eight different graduations, namely B, R, S, K, N, E, J and T. The lowest temperature can be measured at minus 270℃, and the highest temperature can reach 1800℃. その中で, B, R and S belong to the platinum series of thermocouples sensor. Because platinum is a precious metal, they are also called precious metal thermocouples. The remaining few are called cheap metal thermocouples. There are two types of thermocouple structures, common type and armored type. Ordinary thermocouples are generally composed of hot electrodes, insulating tubes, protective sleeves and junction boxes. While the sheathed thermocouple is: a thermocouple wire, the protective insulating material and the metal rear sleeve assembly combination of the three, the processing of a stretched solid combination. しかし, the electrical signal of the thermocouple needs a special wire to transmit, and this wire is called a compensation wire. Different thermocouples require different compensating wires, and their main function is to connect with the thermocouple to keep the reference end of the thermocouple away from the power supply, so that the temperature of the reference end is stable. Compensation wires are divided into two types: compensation type and extension type. The chemical composition of the extension wire is the same as that of the thermocouple to be compensated, but in practice, the extension wire is not made of the same material as the thermocouple. 一般的に, it is replaced by a wire with the same electron density as the thermocouple sensor. The connection between the compensation wire and the thermocouple is generally very clear. The positive connection compensation wire of the thermocouple is a red wire, and the negative connection is connected to the remaining color wire. Most of the general compensation wires are made of copper-nickel alloy.