What are the advantages of different types of thermal resistors?

Thermal resistors are the most commonly used temperature detectors in the medium and low temperature zones. Thermal resistor temperature measurement is based on the characteristic that the resistance value of a metal conductor increases with the increase of temperature to measure temperature. Its main features are high measurement accuracy and stable performance. Among them, the measurement accuracy of platinum thermal resistors is the highest. It is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Thermal resistors are mostly made of pure metal materials. Currently, platinum and copper are the most widely used. In addition, materials such as nickel, manganese and rhodium have begun to be used to manufacture thermal resistors. There are many types of temperature sensing materials commonly used in metal thermal resistors, and the most commonly used is platinum wire. In addition to platinum wire, metal thermal resistor materials for industrial measurement also include copper, nickel, iron, iron-nickel, etc.
The principle of temperature measurement of ordinary thermal resistors
is 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 the resistance of various wires such as the lead wire of the thermal resistor will affect the temperature measurement.
The armored thermal resistor is a solid body composed of a temperature sensing element, a lead wire, an insulating material, and a stainless steel casing. Its outer diameter is generally φ2-φ8mm, and the minimum can reach φ0.25mm. It has the following advantages: small size, no air gap inside, small measurement lag in thermal inertia; good mechanical properties, vibration resistance, impact resistance; can be bent, easy to install and long service life.
The end face thermal resistor temperature sensing element is wound with specially treated resistance wire and is close to the end face of the thermometer. Compared with general axial thermal resistors, 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 bearings and other parts.
The explosion-proof thermal resistor uses a specially structured junction box to confine the explosion of the explosive mixed gas inside its shell due to sparks or arcs to the junction box, and the production site will not cause an explosion. The explosion-proof thermal resistor can be used for temperature measurement in explosion-hazardous places in the bla-b3c level area.
The anti-corrosion thermal resistor uses PTFE anti-corrosion material as an integral protective sleeve or a two-section sleeve. The material can also be directly treated with anti-corrosion treatment on the protective tube in three forms: spraying, sintering and sleeve sealing. It is suitable for measurement in strong alkaline corrosive media, with a temperature resistance of 250℃. The fixed installation form can also use fixed threads, fixed flanges (contact interface surface) or ferrule threads of the same PTFE material. A variety of installation methods and a variety of diameters are available for selection. The thermal sleeve thermal resistor is a special temperature measuring instrument for thermal power generators. It adopts the internationally popular separated protective tube structure and elastic compression measuring element method, adding a high-temperature armored platinum resistor with a temperature measurement upper limit of 650℃.