Classification and selected structure of thermal resistance

Classification of thermal resistance: ordinary thermal resistance According to the temperature measurement principle of the temperature measuring resistance body, the change of the measured temperature is directly measured according to the change of the resistance value of the temperature measuring resistance body, so the lead wires of the temperature measuring resistance body and other various Changes in wire resistance can affect temperature measurements. Sheathed thermoelectric resistance The sheathed temperature measuring resistance body is a solid body composed of a temperature sensing element (resistor body), a wire, an insulating material, and a stainless steel sleeve. Its outer diameter is generally 2--8mm, even if it is small. can reach mm. Compared with ordinary thermoelectric resistors, it has the advantages of small size, no air gap inside, and small measurement delay in thermal inertia. Good mechanical properties, vibration resistance, impact resistance, easy to bend, easy installation and long life. End-face thermal resistance The end-face thermal resistance temperature sensing element is wound with a specially treated resistance wire and is in close contact with the end face of the thermometer. Compared with the general axial thermal resistance, it can reflect the actual temperature of the measured end face more accurately and quickly, and is suitable for measuring the end face temperature of metals and other workpieces. Pressure-resistant explosion-proof thermal resistance Pressure-resistant explosion-proof thermal resistance Through the terminal box with a special structure, the explosion of the explosive gas mixture inside the shell due to the influence of sparks and arcs is limited to the terminal box, and no super explosion will occur in the production site. . Pressure-resistant explosion-proof thermal resistance can be used for temperature measurement in places with explosion hazards in Bla--B3c areas. Selected structure of thermal resistance: proficient thermal resistance: the structure and characteristics of the thermal resistance temperature sensing element (resistor body) commonly used in the industry. According to the temperature measurement principle of the resistance temperature measuring body, the change of the measured temperature is directly measured according to the change of the resistance value of the resistance temperature measuring body, so the change of the resistance of various wires such as the lead wire of the resistance temperature measuring body will affect the temperature measurement. In order to eliminate the influence of lead resistance, a three-wire or four-wire type is used. Sheath thermal resistance: Sheath thermal resistance is a solid body composed of temperature sensing element (resistor body), wire, insulating material, and stainless steel sleeve. The outer diameter is 2~8mm, and the smallest is mm. Compared with general thermoelectric resistance, it has the following advantages. Small size, no air gap inside, and small measurement delay due to thermal inertia. Good mechanical properties, vibration resistance, impact resistance, bending, easy installation. long life. End-face thermal resistance: The end-face thermal resistance temperature sensing element is wound with a specially treated resistance wire and is in close contact with the end face of the thermometer. Compared with the general axial thermal resistance, it can reflect the actual temperature of the measured end face more accurately and quickly, and is suitable for measuring the end face temperature of metals and other workpieces. Pressure-resistant and explosion-proof thermal resistance: The explosion-proof thermal resistance of pressure-resistant type passes through a terminal box with a special structure, and the explosion caused by the explosive gas mixture inside the shell due to the influence of sparks and arcs is limited to the terminal box. explode. Pressure-resistant explosion-proof thermal resistance can be used for temperature measurement in places with explosion hazard in Bla~B3c level areas.

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