What is the difference between thermal resistance thermometer and armored thermal resistance temperature instrument?

Although armored thermal resistors are widely used in industry, their application is limited by their temperature measurement range. The temperature measurement principle of thermal resistors is based on the characteristic that the resistance value of a conductor or semiconductor changes with temperature. It has many advantages, such as remote transmission of electrical signals, high sensitivity, strong stability, good interchangeability and accuracy, but it requires power excitation and cannot measure temperature changes instantaneously. Industrial thermal resistors generally use Pt100, Pt10, Cu50, Cu100. The temperature measurement range of platinum thermal resistors is generally minus 200-800℃, and that of copper thermal resistors is minus 40 to 140℃. Thermal resistors are classified into the same types as thermocouples, but they do not require compensation wires and are cheaper than thermocouples. What is the difference between thermal resistance thermometer and armored thermal resistance temperature meter?

Thermal resistance thermometer uses thermal resistance as the temperature measuring element. It is composed of thermal resistance and display instrument (moving coil instrument or automatic balancing bridge, etc.), which are connected by wires to transmit the resistance change information to the display instrument to reflect the measured temperature.

The armored thermal resistance is a solid body composed of temperature sensing element (resistor), lead wire, insulating material, and stainless steel casing. Its outer diameter is generally φ2-φ8mm, and the smallest can reach φ0.25mm. Compared with ordinary thermal resistance, it has the following advantages:

① Small size, no air gap inside, thermal inertia, small measurement value;

② Good mechanical properties, vibration resistance, and impact resistance;

③ Can be bent, easy to install;

④ Long service life.

Armored thermal resistor is a commonly used temperature measuring element in temperature measuring instruments. When the two ends of two conductors of different components are connected into a loop, when the temperatures of the two junction thermocouples are different, a thermal current will be generated in the loop. 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 thermal resistor is a temperature sensor. It is smaller in diameter than assembled thermocouples, easy to bend, and has good shock resistance. It is suitable for installation in places where assembled thermocouples cannot be installed. The armored thermal resistors produced by the company use imported thermal resistor temperature measuring elements. Therefore, it has the advantages of accuracy, sensitivity, fast thermal response time, stable quality, and long service life.