What are the structures of thermal resistors?

(1) Mastery type thermistor
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.
(Two wire system: Two wires and the transmission power supply also transmit signals, that is, the load output by the sensor and the power supply are connected in series, and the power supply is introduced from the outside and connected in series with the load to drive the load. Three wire system: Three wire system: The sensor is separated from the positive terminal of the power supply and the positive terminal of the signal output, but they share a COM terminal. Four wire system: Two wires for the power supply and two wires for the signal. The power supply and signal work separately.)
(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. 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, and has a long service life.
(3) End face thermistor
The end face thermal resistance temperature sensing element is made of specially processed resistance wire wound tightly on the end face of the thermometer. Compared with general axial thermal resistance, 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 thermistor uses a special structure of junction box to confine the explosion of explosive mixed gas inside its shell caused by sparks or arcs within the junction box, so as not to cause excessive explosion in the production site. Explosion proof thermal resistors can be used for temperature measurement in areas with explosive hazards within Bla~B3c class zones.