How is the effect of K-type temperature sensor/thermocouple

K-type armored thermocouple is the most widely used temperature device in temperature measurement. Its main feature is a wide range of kiss measurement, relatively stable performance, simple structure, good dynamic response, and can transmit 4-20mA electrical signals remotely, which is convenient Automatic control and centralized control. The principle of thermocouple temperature measurement is based on the thermoelectric effect. Connecting two different conductors or semiconductors into a closed loop, when the temperatures at the two junctions are different, thermoelectric potential will be generated in the loop. This phenomenon is called the thermoelectric effect, also known as the Seebeck effect. The thermoelectric potential generated in the closed loop is composed of two kinds of electric potentials; thermoelectric potential and contact potential. Thermoelectric potential refers to the electric potential produced by the two ends of the same conductor due to different temperatures. Different conductors have different electron densities, so they generate different electric potentials. The contact potential, as the name implies, refers to when two different conductors are in contact. Because their electron densities are different, a certain amount of electron diffusion occurs. When they reach a certain equilibrium, the potential formed by the contact potential depends on the material properties of the two different conductors and the temperature of their contact points. Type armored thermocouple has the advantages of bendability, high pressure resistance, fast thermal response time, sturdiness and durability. The armored thermocouple is the same as the assembled thermocouple. As a temperature sensor, usually armored thermocouple and display instrument, recorder It can be used with electronic regulator, meanwhile, armored thermocouple can also be used as temperature sensing element of assembled thermocouple. Armoured thermocouples can directly measure the temperature of liquid, steam and gaseous media and solid surfaces in the range of 0℃～1100℃ in various production processes. Through the introduction of various parameters and characteristics of armored thermocouples, everyone should have a deeper understanding of this. Thermocouples need to be selected according to the actual situation and requirements. They are not universal. Choosing the most suitable product can bring beneficial effects to production. Otherwise, it will only increase troubles and cause unnecessary troubles to quality. Armored thermoelectrics The even electrode is composed of two metal materials with different conductors. When the temperature difference between the measuring terminal and the reference terminal, a thermoelectric potential is generated. This potential is called the output millivolt signal (mV), and the working instrument will use it This principle converts and processes this thermoelectric potential so that it can display the corresponding temperature value.
      Armoured thermocouples can generally measure gas, liquid and steam, and solid surface or internal temperature in the range of 0～1300℃. They can be used with digital instruments, recording and regulating instruments, PLC, data collectors or computers as a new generation of temperature sensors. , It can be widely used in various departments such as metallurgy, petroleum, chemical industry, electric power, light industry, textile, food, national defense and scientific research. There is a standard specification for thermocouples used internationally. The international regulations stipulate that thermocouples are divided into eight different divisions, namely B, R, S, K, N, E, J and T. The measured temperature is low and measurable. Minus 270 degrees Celsius, up to 1800 degrees Celsius, of which B, R, S belong to the platinum series of thermocouples, because platinum is a precious metal, they are also called precious metal thermocouples and the remaining ones are called cheap metal thermocouples . There are two types of thermocouples, common type and armored type. Ordinary thermocouples are generally composed of thermode, insulating tube, protective sleeve and junction box, while armored thermocouple is a combination of thermocouple wire, insulating material and metal protective sleeve. A solid combination formed by stretching. But the electrical signal of the thermocouple needs a special wire to transmit, this kind of wire is called compensation wire. Different thermocouples need different compensation 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 being compensated. However, in practice, the extension wire is not made of the same material as the thermocouple. Replace with wires with the same electron density. The connection between the compensation wire and the thermocouple is generally very clear. The positive pole of the thermocouple is connected to the red wire of the compensation wire, and the negative pole is connected to the remaining color. Most of the general compensation wires are made of copper-nickel alloy.
      Simple armored thermocouple WRNK-101, armored thermocouple has the advantages of slenderness, easy bending, fast thermal response time, vibration resistance, temperature resistance, compression resistance and durability. It can be used for direct measurement or as the inner core element of a fabricated thermocouple to replace the traditional ceramic bead stringed element. It is especially suitable for installation in narrow, curved and fast response, miniaturization and special temperature measurement occasions between pipes.