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

The temperature measurement principle of thermal resistors is based on the characteristic that the resistance value of conductors or semiconductors 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, and 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.

Thermal resistor temperature sensors are a type of sensor thermometer that uses the principle that the resistance value of a conductor or semiconductor changes with temperature to measure temperature.

Thermal resistor temperature sensors are divided into two categories: metal thermal resistors and semiconductor thermistors. Thermal resistors are widely used to measure temperatures in the range of -200~+850°C. In a few cases, low temperatures can be measured to 1K and high temperatures to 1000°C.

Thermistor temperature sensor is a commonly used temperature sensor product. It can measure temperature by using the principle that the resistance value of a conductor or semiconductor changes with temperature. It has the advantages of stable performance, flexible use, and high reliability.

Ordinary thermal resistor

Although armored thermal resistors are widely used in industry, their application is limited to a certain extent due to their temperature measurement range

Ordinary thermal resistor

From the temperature measurement principle of thermal resistors, it can be seen that the change of the measured temperature is directly measured by the change of the resistance value of the thermal resistor. Therefore, the change of various wire resistances such as the lead wire of the thermal resistor body will affect the temperature measurement.

The armored thermal resistor is a solid body composed of a temperature sensing element (resistor body), 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 resistors, it has the following advantages:

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

② Good mechanical properties, vibration resistance, 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 digital display will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple.

Armored thermal resistor is a temperature sensor. It has a smaller diameter than the assembled thermocouple, is easy to bend, has good shock resistance, and is 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, it has the advantages of accuracy, sensitivity, fast thermal response time, stable quality, and long service life.