T-shaped WRCK armored thermocouple

1、 Overview

Armored thermocouples have the advantages of bending, high voltage resistance, fast thermal response time, and durability. Like prefabricated thermocouples and thermal resistors, they are commonly used as temperature sensors in conjunction with display instruments, recorders, and electronic regulators. They can also serve as temperature sensing elements for prefabricated thermocouples. It can directly measure the temperature of liquid, vapor, gas media, and solid surfaces in the range of 0 ℃ to 1300 ℃ during various production processes.

Armored thermocouples, like general industrial thermocouples, are matched with display instruments to automatically detect or adjust the surface temperature of gases, liquid media, or solids within a certain range of use.

2、 Working principle

Armored thermocouple is formed by welding two conductors with different compositions at both ends to form a circuit. The direct temperature measuring end is called the measuring end, and the wiring end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

The thermoelectric potential of the armored thermocouple will increase with the temperature rise at the measuring end. The magnitude of the thermoelectric potential is only related to the material of the armored thermocouple conductor and the temperature difference between the two ends, and is independent of the length and diameter of the thermoelectric electrode.

The structure of armored thermocouples is made up of conductors, insulated magnesium oxide, and 1Cr18Ni9Ti stainless steel protective tubes that have been drawn multiple times. Armored thermocouple products mainly consist of junction boxes, terminal blocks, and armored thermocouples, and are equipped with various installation and fixing devices. Armored thermocouples are divided into two types: insulated and shell connected.

Explosion proof armored thermocouple utilizes the principle of gap explosion-proof to design junction boxes and other components with sufficient strength. All components that can generate sparks, arcs, and dangerous temperatures are sealed inside the junction box cavity. When an explosion occurs inside the cavity, it can be extinguished and cooled through the gap between the joint surfaces, preventing the flame and temperature after the explosion from being transmitted outside the cavity, thus achieving explosion-proof.