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Application Of Thermal Resistance
Jan 22, 2018

Application of Thermal Resistance

Application of Thermal Resistance

Thermal resistance is the most commonly used in the low temperature zone of a temperature detector. Its main characteristic is the measurement accuracy is high, the performance is stable. Platinum heat resistance is the highest measurement accuracy, which is widely used not only in industrial temperature measurement, but also made into a standard reference.

1. Principle and Material of Thermal Resistance Temperature Measurement

Thermal resistance measurement is based on the metal conductor resistance increases with the temperature of the characteristics of this feature to the temperature measurement.

Thermal resistance mostly from pure metal materials, is currently the most widely used platinum and copper, in addition, has now begun to use Austin, nickel, manganese and rhodium materials such as thermal resistance.

2. Thermal resistance of the structure

(1) proficient thermal resistance Industrial commonly used thermal resistance temperature sensing element (resistor) structure and characteristics of Table 2-1-11. From the thermal resistance of the principle of temperature measurement shows that the measured temperature change is directly measured by the resistance of the thermal resistance changes, so the thermal resistance of the lead wire and other wire resistance changes will affect the temperature measurement. In order to eliminate the influence of the lead resistance, the same applies to the three-wire system or four-wire system, the specific content of the third chapter of this chapter,

(2) armored thermal resistance armored thermal resistance by the temperature sensing element (resistor body), lead, insulation, stainless steel casing made of a solid body, as shown in Figure 2-1-7, its outer diameter Generally φ2 ~ φ8mm, the smallest up to φmm.

It has the following advantages: ① small size, no internal air gap, thermal inertia, the measurement of small hysteresis; ② mechanical properties, vibration resistance, impact resistance; ③ bending, easy to install ④ long life .

(3) end of the thermal resistance of the thermal resistance surface temperature resistance element by a special treatment of resistance wire material wound, close to the thermometer end, the structure shown in Figure 2-1-8. It is compared with the general axial thermal resistance, can more accurately and quickly reflect the measured end of the actual temperature, suitable for measuring the bearing and other parts of the end surface temperature.

(4) Explosion-proof thermal resistance flameproof thermal resistance through a special structure of the junction box, the explosive gas mixture inside the shell due to the impact of sparks or arcs and other explosive confined in the junction box, the production site will not lead to super-explosion . Flameproof thermal resistance can be used in Bla ~ B3c-class area with explosive temperature of the temperature measurement.

3. The Composition of Thermal Resistance Temperature Measurement System

Thermal resistance temperature measurement system generally consists of thermal resistance, connecting wires and display instruments and other components. Must pay attention to the following two points:

① thermal resistance and display the sub-degree number must be consistent

(2) In order to eliminate the influence of the change of resistance of the connecting wire, the three-wire connection method must be adopted. See the third chapter of this chapter.

(2) armored thermal resistance armored thermal resistance by the temperature sensing element (resistor body), lead, insulation, stainless steel casing made of a solid body, as shown in Figure 2-1-7, its outer diameter Generally φ2 ~ φ8mm, the smallest up to φmm.

It has the following advantages: ① small size, no internal air gap, thermal inertia, the measurement of small hysteresis; ② mechanical properties, vibration resistance, impact resistance; ③ bending, easy to install ④ long life .

(3) end of the thermal resistance of the thermal resistance surface temperature resistance element by a special treatment of resistance wire material wound, close to the thermometer end, the structure shown in Figure 2-1-8. It is compared with the general axial thermal resistance, can more accurately and quickly reflect the measured end of the actual temperature, suitable for measuring the bearing and other parts of the end surface temperature.

(4) Flameproof thermal resistance Flameproof thermal resistance through a special structure of the junction box, the explosive gas mixture inside the shell due to the spark or arc, etc.

Resistance of the circuit breaker repair must change the length of the resistance wire and affect the resistance value, for the replacement of the new resistor body as well, if the use of welding repair, after welding to check the qualified before use.


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