Temperature Sensor

1. Room temperature tube temperature sensor: Room temperature sensors are used to measure indoor and outdoor ambient temperatures, while tube temperature sensors are used to measure the wall temperatures of evaporators and condensers. The shapes of room temperature sensors and tube temperature sensors are different, but the temperature characteristics are basically the same. According to 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 10K Ω ± 3% corresponding to 25 ℃. The corresponding resistance tolerance at 0 ℃ and 55 ℃ is about ± 7%; Below 0 ℃ and above 55 ℃, there may be certain differences in resistance tolerance among different suppliers. The higher the temperature, the smaller the resistance value; The lower the temperature, the greater the resistance value. The farther away 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, with a constant B value of 3950K ± 3% and a reference resistance of 5K Ω ± 3% corresponding to 90 ℃.
3. Module temperature sensor: The module temperature sensor is used to measure the temperature of variable frequency modules (IGBT or IPM), with a temperature sensing head model of 602F-3500F and a reference resistance of 6K Ω ± 1% corresponding to 25 ℃. The corresponding resistance values for several typical temperatures are -10 ℃ → (25.897~28.623) K Ω; 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 not only have a wide variety of types but also have various combinations, and suitable products should be selected according to different locations.
Temperature measurement principle: Based on the principle that the resistance value and the potential of the thermocouple change regularly with different temperatures, we can obtain the temperature value that needs to be measured.