What is the difference between armored thermocouple and electric thermocouple?

The thermoelectric potential of the armored thermocouple will increase as the temperature of the measuring end increases. The size of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference between the two ends, and has nothing to do with the length and diameter of the thermoelectrode.

The two ends of the conductors of two different components are welded to form a loop. The direct temperature measuring end is called the working end, and the terminal end is called the cold end, also known as the reference end. When there is a temperature difference between the working end and the reference end, a thermal current will be generated in the loop. When the display instrument is connected, the corresponding temperature value of the thermoelectric potential generated by the thermocouple will be indicated on the instrument. What is the difference between armored thermocouples and electric thermocouples?

Electric thermocouples are temperature sensing wires and sensors on mold temperature machines. They are probes for measuring temperature.
The basic function of electric thermocouples is to generate thermoelectric potential when the temperatures at both ends of the thermocouple are different (temperature difference).
Its main purpose
is to detect temperature by using the fixed relationship between thermoelectric potential and temperature difference; second, it is used for temperature difference power generation.

It is mainly used for temperature measurement. According to different temperature ranges, it is divided into B, R, S, K, N, E, J, and T types. The lowest temperature is -270℃ and the highest temperature is 1800℃.

Structural principle of armored thermocouple

It is made of conductor, high insulation magnesium oxide, and outer jacket 1Cr18Ni9Ti stainless steel protection tube, which are drawn in one piece many times. The armored thermocouple product mainly consists of junction box, terminal block and armored thermocouple as the basic structure, and is equipped with various installation and fixing devices.

Armored thermocouple is divided into insulated type and shell type.

It has many advantages such as bending, high pressure resistance, fast thermal response time and durability. It is used as a temperature sensor like industrial use, and is used in conjunction with compensation wires and digital display meters, recording instruments and electronic regulators. At the same time, it can also be used as a temperature sensing element. It can directly measure the temperature of liquids, steam and its gas medium and solid surface in the range of 0℃~800℃ in various production processes. Compared with, armored thermocouples have the advantages of bendability, high pressure resistance, short thermal response time and durability.

Thermocouple temperature measurement principle

is based on the thermoelectric effect. When two different conductors or semiconductors are connected into a closed loop, when the temperatures at the two junctions are different, a thermoelectric potential will be generated in the loop. This phenomenon is called the thermoelectric effect, also known as the Seebeck effect.

As a temperature measurement sensor, armored thermocouples are usually used in conjunction with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control the temperature of fluids, steam and gas media and solid surfaces in the range of 0-1800℃ in various production processes.

Armored thermocouples have many advantages such as bendability, high pressure resistance, fast thermal response time and durability. Like industrial assembled thermocouples, they are used as sensors for measuring temperature and are usually used in conjunction with display instruments, recording instruments and electronic regulators.

Calibration method of armored thermocouples

Calibration method and device for rapid armored thermocouples of metal melts

The device is mainly composed of a flat heating coil that can accommodate the quartz tubes at the ends of two measured pairs, two armored thermocouples of the same shape as the measured pairs, and a corresponding temperature control display output device.

Verification method:

First, use two calibration thermocouples to find the points in the flat heating coil that make the two calibration pairs have the same thermoelectric potential, and replace one of the calibration pairs with the measured pair. When other conditions remain unchanged, after the reading of the measured pair stabilizes, it can be compared with the reading of the calibration pair to know whether the value of the measured pair is accurate.

Features:

a. The device is composed of a flat heating coil, a pair of calibration armored thermocouples, and a temperature control display output device.

b. The verification method is to first insert two calibration thermocouples from both ends of the heating coil to each other so that the hot ends of the armored thermocouples are in contact. By changing the position of the calibration thermocouples in the heating coil, the thermoelectric potentials of the two calibration thermocouples are made the same. Replace one of the calibration thermocouples with the fast thermocouple to be tested, read its thermoelectric potential value in the stable state and compare it with the thermoelectric potential of the calibration thermocouple to know the fast armored thermocouple to be tested.