Thermal resistance is a kind of temperature detector with high precision and stable performance. Temperature measurements are made according to the characteristic that the resistance of metal conductors increases with the increase of temperature. What are the structures of thermal resistors? Below is a little tape for you to understand. I hope it will help you.
1. Temperature Sensor (Metal Resistance Wire)
Resistor wires can convert electrical energy into internal energy. Generally speaking, temperature rise resistance will change. In a certain temperature range, we can think that temperature change and resistance change into a linear relationship, so we can convert temperature change into resistance change.
2. Skeleton
The skeleton is used for winding thermal resistors and for fixing and supporting resistance wires. It is necessary to choose materials with good electrical insulation, high mechanical strength under high mixing, small volume expansion coefficient, stable physical and chemical properties, and no pollution to thermal resistance to make skeleton. Quartz, mica, ceramics, glass and plastics are commonly used.
3. Leads
The diameter of the lead wire is several times larger than that of the thermal resistance wire, so as to minimize the resistance of the lead wire and increase the mechanical strength and reliability of the connection. For industrial platinum thermal resistance, silver wire of LMM is generally used as the lead; for standard platinum thermal resistance, platinum wire of 0.3mm is used as the lead; for copper thermal resistance, 0.5mm is commonly used. Copper wire.
After the thermal resistance wire is wound on the skeleton and the lead wire is welded, the mica sheet is added to protect the skeleton. A thermal resistance sensor is obtained when the outer protective sleeve is installed and connected to the junction box or external wire.