The difference between thermocouple and armored thermocouple

The thermoelectric potential of armored thermocouples will increase as the temperature at the measuring end rises. The magnitude of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference at both ends, and is independent of the length and diameter of the thermoelectric electrode. Two conductors with different compositions are welded at both ends to form a circuit. The temperature measuring end is called the working end, and the wiring 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 circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.
Electric thermocouple is a temperature sensing wire that is a sensor on a mold temperature machine. It is a probe used for measuring temperature. The basic function of an electric thermocouple is to generate a thermoelectric potential when there is a temperature difference (temperature difference) between the two ends of the thermocouple. Its main purpose is to use the fixed relationship between thermoelectric potential and temperature difference to detect temperature; The second is used for temperature difference power generation. According to different temperature ranges, it can be divided into B, R, S, K, N, E, J, T types, with a minimum temperature of minus 270 ℃ and a maximum temperature of 1800 ℃.
The structural principle of armored thermocouples is composed of a conductor, high insulation magnesium oxide, and a protective tube made of 1Cr18Ni9Ti stainless steel, which is pulled together multiple times. Armored thermocouple products are mainly composed 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.
Armored thermocouples have many advantages such as bending, high voltage resistance, fast thermal response time, and durability. Like industrial sensors, they are commonly used as temperature sensors and are often paired with display instruments, recording instruments, and electronic regulators. At the same time, they can also be used as temperature sensing elements. It can directly measure the temperature of liquids, vapors, gas media, and solid surfaces in the range of 0 ℃~800 ℃ during various production processes. Compared to others, armored thermocouples have advantages such as bendability, high voltage resistance, short thermal response time, and durability.
Armored thermocouples, as temperature measurement sensors, are usually used in conjunction with temperature transmitters, regulators, and display instruments to form process control systems. They are used to directly measure or control the temperature of fluids, vapors, gas media, and solid surfaces within the range of 0-1800 ℃ in various production processes. Armored thermocouples have many advantages such as bending, high voltage resistance, fast thermal response time, and durability. Like industrial assembled thermocouples, they are commonly used as temperature sensors in conjunction with display instruments, recording instruments, and electronic regulators.
Verification method for armored thermocouples
Verification method and device for rapid armored thermocouple of metal melt. The device mainly consists of a flat heating coil that can accommodate two quartz tubes at the ends of the tested couples, two armored thermocouples with the same shape as the tested couples, and corresponding temperature control display output devices.
Verification method: First, use two calibration thermocouples to find the point in the flat heating coil where the thermoelectric potentials of these two calibration thermocouples are the same. Replace one of the calibration thermocouples with the one being verified. Under other unchanged conditions, compare the reading of the verified thermocouple with that of the calibration thermocouple to determine whether the measured value of the verified thermocouple is accurate.
The characteristics are:
a, The device consists of a flat heating coil, a pair of calibrated armored thermocouples, and a temperature control display output device.
b, The verification method is to first insert two calibration thermocouples into the heating coil from opposite ends, so that the armored thermocouple contacts the hot end. By changing the position of the calibration thermocouple in the heating coil, the thermoelectric potential of the two calibration thermocouples is made the same. Replace one of the calibration thermocouples with the tested fast thermocouple, and compare its steady-state thermoelectric potential value with the thermoelectric potential of the calibration thermocouple to determine the accuracy of the tested fast armored thermocouple.