The difference between industrial thermistor and armored thermistor

Industrial thermistors generally use Pt100, Pt10,Cu50,Cu100, The temperature measurement range of platinum resistance thermometers is generally -200-800 ℃, while that of copper resistance thermometers is -40 to 140 ℃. Thermistors and thermocouples have the same type of differentiation, but they do not require compensating wires and are cheaper than thermocouples.
Industrial thermistors, 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 liquids, vapors, gas media, and solid surfaces within the range of -200 ℃ to -500 ℃ in various production processes·
Thermistor measures temperature by utilizing the characteristic that the resistance of a substance also changes with temperature changes. When there is a temperature gradient in the measured medium, the measured temperature is the average temperature in the medium where the temperature sensing element is located. According to the temperature measurement principle of a typical thermistor, the change in the measured temperature is directly measured by the change in the resistance value of the thermistor. Therefore, changes in the resistance of various wires such as the lead wires of the thermistor can affect temperature measurement.
Although there are significant differences in the appearance of various thermal resistors, their basic structures are generally similar, consisting mainly of temperature sensing elements, insulation sleeves, protective tubes, and junction boxes.
Although armored thermal resistors are widely used in industry, their application is limited due to their temperature measurement range. The temperature measurement principle of thermal resistors is based on the characteristic that the resistance value of conductors or semiconductors changes with temperature. It also has many advantages, such as remote transmission of electrical signals, high sensitivity, strong stability, good interchangeability and accuracy. However, it requires power excitation and cannot measure temperature changes instantaneously.
Armored thermistor is a solid body composed of temperature sensing elements (resistors), leads, insulation materials, and stainless steel sleeves. Its outer diameter is generally between 2 and 8mm, with a minimum of 0.25mm. Compared with ordinary thermistors, it has the following advantages:
① Small size, no air gap inside, thermal inertia, small measured value;
② Good mechanical performance, vibration resistance, and impact resistance;
③ Can bend, easy to install;
④ Long service life.
Armored thermistor is a commonly used temperature measuring element in temperature measuring instruments. It is composed of two conductors with different compositions connected at both ends to form a circuit. When the temperature of the thermocouple at the two junction points is different, a thermal current will be generated in the circuit. If there is a temperature difference between the working end and the reference end of the thermocouple, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.
Armored thermocouple is a type of temperature sensor that has a smaller diameter, is more flexible, and has better seismic resistance compared to prefabricated thermocouples. It is suitable for installation in situations where prefabricated thermocouples cannot be installed. The company's armored thermocouples use imported thermistor temperature measuring elements, which have the advantages of precision, sensitivity, fast thermal response time, stable quality, and long service life.