Thermal resistance is the most commonly used temperature detector in the medium to low temperature range

Thermal resistance is the most commonly used temperature detector in the medium to low temperature range

Thermal resistance is the most commonly used temperature detector in the medium to low temperature range. Platinum heat resistance has the highest measurement accuracy, and it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Its main characteristics are high measurement accuracy and stable performance.

1. Principle and Materials of Thermal Resistance Temperature Measurement

Thermal resistance temperature measurement is based on the characteristic that the resistance value of a metal conductor increases with the increase of temperature for temperature measurement.

Most thermal resistors are made of pure metal materials, with platinum and copper being the most commonly used. In addition, materials such as platinum, nickel, manganese, and rhodium have now been used to manufacture thermal resistors.

2. Composition of thermal resistance temperature measurement system

A thermal resistance temperature measurement system generally consists of a thermal resistance, connecting wires, and display instruments. The following two points must be noted:

① The graduation numbers of the thermal resistor and display instrument must be consistent

② In order to eliminate the influence of changes in the resistance of the connecting wires, the three-wire connection method must be adopted.

The explosion-proof thermoelectric resistor uses a special structure of the junction box to connect the explosive mixture inside its casing due to the influence of sparks or arcs.

The repair of the open circuit of the resistor body inevitably requires changing the length of the resistor wire and affecting the resistance value. Therefore, it is better to replace the resistor body with a new one. If welding repair is used, it must be verified to be qualified after welding before use

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