Sensor Temperature

1. Room temperature tube temperature sensor: The room temperature sensor is used to measure the indoor and outdoor ambient temperature, and the tube temperature sensor is used to measure the tube wall temperature of the evaporator and condenser. The room temperature sensor and the tube temperature sensor have different shapes, but the temperature characteristics are basically the same. According to the temperature characteristics, there are two types of room temperature tube temperature sensors used by Midea: 1. The constant B value is 4100K±3%, and the reference resistance is 25℃ corresponding to the resistance of 10KΩ±3%. The corresponding resistance tolerance at 0℃ and 55℃ is about ±7%; and below 0℃ and above 55℃, for different suppliers, the resistance tolerance will be different. The higher the temperature, the smaller the resistance; the lower the temperature, the larger the resistance. The farther from 25℃, the larger the corresponding resistance tolerance range.
2. Exhaust temperature sensor: The exhaust temperature sensor is used to measure the exhaust temperature at the top of the compressor. The constant B value is 3950K±3%, and the reference resistance is 90℃ corresponding to the resistance of 5KΩ±3%.
3. Module temperature sensor: The module temperature sensor is used to measure the temperature of the frequency conversion module (IGBT or IPM). The model of the temperature sensor is 602F-3500F, and the reference resistance is 25℃ corresponding to 6KΩ±1%. The corresponding resistance values ​​of several typical temperatures are: -10℃→(25.897～28.623)KΩ; 0℃→(16.3248～17.7164)KΩ; 50℃→(2.3262～2.5153)KΩ; 90℃→(0.6671～0.7565)KΩ.
There are many types of temperature sensors, and the commonly used ones are thermal resistors: PT100, PT1000, Cu50, Cu100; thermocouples: B, E, J, K, S, etc. Temperature sensors are not only of various types, but also of various combinations. Appropriate products should be selected according to different places.
Temperature measurement principle: Based on the principle that the resistance value and the potential of the thermocouple change regularly with temperature, we can get the temperature value we need to measure.