Selection of Thermistor

The currently widely used thermal resistance materials are platinum and copper: platinum has high resistance accuracy, is suitable for neutral and oxidizing media, has good stability, and has a certain degree of nonlinearity. The higher the temperature, the smaller the resistance change rate; Copper resistors have a linear relationship between resistance and temperature within the temperature measurement range, with a large number of temperature lines. They are suitable for non corrosive media and are prone to oxidation when exceeding 150. The commonly used ones in China include R0=10 Ω, R0=100 Ω, and R0=1000 Ω, with division marks of Pt10 Pt100,Pt1000; There are two types of copper resistors, R0=50 Ω and R0=100 Ω, with their division marks being Cu50 and Cu100. Among them, Pt100 and Cu50 have a wide range of applications.

Selection structure
(1) Proficient Thermistor: The structure and characteristics of temperature sensing elements (resistors) commonly used in industry. According to the temperature measurement principle of thermal resistance, the change in the measured temperature is directly measured by the change in the resistance value of the thermal resistance. Therefore, the change in resistance of various wires such as the lead wires of the thermal resistance body will have an impact on temperature measurement. To eliminate the influence of lead resistance, a three wire or four wire system is generally used.
(2) Armored thermistor: 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, and can be as small as 2mm. Compared with ordinary thermistors, it has the following advantages:
① Small size, no air gap inside, low measurement lag in terms of thermal inertia;
② Good mechanical performance, vibration resistance, and impact resistance;
③ Can bend, easy to install
④ Long service life.
(3) End face thermistor: The temperature sensing element of the end face thermistor is wound with specially treated resistance wire and tightly attached to the end face of the thermometer. Compared with general axial resistance thermometers, it can more accurately and quickly reflect the actual temperature of the measured end face, and is suitable for measuring the end face temperature of bearing shells and other components.
(4) Explosion proof Thermistor: Explosion proof Thermistors use a specially designed junction box to confine the explosion of explosive mixed gases inside their casing caused by sparks or arcs within the junction box, and will not cause an explosion on the production site. Explosion proof thermal resistors can be used for temperature measurement in areas with explosive hazards within Bla~B3c class zones.