Platinum resistance temperature sensors have different resistances according to different temperatures. The platinum resistance is connected to the circuit, and the change of resistance can be known by observing the change of current. This paper mainly introduces the working principle and advantages of platinum resistance temperature sensor.

Pt100 platinum resistance: air conditioning laboratory usually has a lot of temperature measuring points, high-precision measuring points are often used platinum resistance. We all know that the resistance value is related to the material, length, and cross-sectional area. Of course, temperature is also an indispensable factor. The thermometer that uses the resistance change caused by the temperature change to measure the temperature is called the hot platinum resistance. The thermometer has simple structure, convenient use, stable performance, high measurement accuracy and sensitivity, and is convenient for remote signal transmission, automatic recording and centralized control. It is usually suitable for temperature measurement between -200 and 500 °.

Pt100 platinum resistance: Standard platinum platinum resistance thermometer is a precision measuring instrument, which measures temperature according to the characteristics of the resistance value of metal platinum changing with temperature. It consists of a temperature sensing element composed of platinum wire, an insulating skeleton, a protective sleeve and a wire. The molybdenum wire wound on the skeleton adopts a stress-free structure, so that the temperature-sensitive platinum wire can freely expand and contract when the temperature changes. Under the action of external force, such as vibration and improper operation of transporting goods, the platinum wire will deform. Each part of the platinum wire is stressed. When the temperature is above 0.01 °, the resistance value of the platinum wire will increase, and the deformed platinum wire is in a stable state. Therefore, deformation and stress are important factors that lead to the instability of the resistance value of the standard platinum resistance thermometer.

Some users spend a lot of money to buy high-precision meters and transmitters (excluding those false indicators of the product), back connected to the sensor, the measurement effect is always not ideal. Is there a problem with the quality of the instrument and transmitter, which has been fooled by the manufacturer?

It may be superfluous for many experts who study temperature measurement all the year round, but it is still necessary to emphasize the concept and principle of contact temperature measurement, because a large number of facts show how easy it is to ignore the important details of contact temperature measurement in practical application.

Theory and textbooks often describe the use of industrial platinum resistance temperature range is -200~850 ℃. However, the real operating temperature range of industrial platinum resistance cannot exceed 500 ℃. However, since the insulation resistance requirement for high temperature measurement of thermal resistance is higher than that for thermocouple temperature measurement, and the high temperature insulation stability of thermal resistance is not easy to guarantee, thermocouple should be used for temperature measurement as much as possible when the temperature measurement temperature is higher than 300 ℃. If the temperature measurement accuracy of thermocouple is not enough, "Jinwei brand thermocouple intelligent integrated temperature transmitter" should be considered ".