The difference between industrial platinum copper thermal resistor and armored thermal resistor

The copper thermal resistor of the industrial platinum-copper thermal resistor is an instrument that measures temperature based on the principle that the resistance of the metal changes with temperature. Copper thermal resistors are divided into assembled type (detachable) and armored type (non-detachable, with built-in platinum resistor) according to the structure of their protective tubes. Thermal resistors are designed and manufactured based on the basic principle that the resistance value of platinum wire changes with temperature. According to the resistance value R (℃) at 0℃, they are divided into 10 ohms (Pt10) and 100 ohms (Pt100), etc. The temperature measurement range is large and suitable for -200~850℃. 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℃.
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. It can also transmit electrical signals remotely, has high sensitivity, strong stability, good interchangeability and accuracy, but requires power excitation and cannot measure temperature changes instantaneously.
Armored thermal resistors are solid bodies composed of temperature sensing elements (resistance bodies), lead wires, insulating materials, and stainless steel casings. Its outer diameter is generally φ2-φ8mm, and the minimum can reach φ0.25mm. Compared with ordinary thermal resistors, it has the following advantages:
① Small size, no air gap inside, good thermal inertia, and small measurement value;
② Good mechanical properties, vibration resistance, and impact resistance;
③ Can be bent for easy installation;
④ Long service life. Armored thermal resistors are commonly used temperature measuring elements 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 junctions 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 resistors are a type of temperature sensor. They are smaller in diameter than assembled thermocouples, easier to bend, and have good shock resistance. They are suitable for installation in places where assembled thermocouples cannot be installed. The armored thermocouples produced by the company use imported thermal resistor temperature measuring elements. Therefore, they have the advantages of accuracy, sensitivity, fast thermal response time, stable quality, and long service life.