1. Room 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 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 in the United States: 1. The constant B value is 4100K±3%, and the reference resistance is 25°C corresponding to the resistance 10KΩ±3%. The higher the temperature, the smaller the resistance; the lower the temperature, the greater the resistance. The farther away from 25°C, the larger the corresponding resistance tolerance range; the corresponding resistance tolerance at 0°C and 55°C is about ±7%; and below 0°C and above 55°C, the resistance tolerance will be different for different suppliers. . The higher the temperature, the smaller the resistance; the lower the temperature, the greater the resistance. The farther away from 25 °C, the larger the corresponding resistance tolerance range.
2. Exhaust gas temperature sensor: The exhaust gas temperature sensor is used to measure the exhaust gas temperature at the top of the compressor. The constant B value is 3950K±3%, and the reference resistance is 90°C corresponding to the resistance 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 current temperature sensor type is 602F-3500F, and the reference resistance is 25°C corresponding to the resistance 6KΩ±1%. The corresponding resistance values ​​of several typical temperatures are: -10 ° C → (25.897 - 28.623) KΩ; 0 ° C → (16.3248 - 17.78164) KΩ; 50 ° C → (2.3262 - 2.5153) KΩ; 90 ° C → (0.6671 - 0.7565) KΩ.
There are many types of temperature sensors, and there are often used thermal resistors: PT100, PT1000, Cu50, Cu100; thermocouples: B, E, J, K, S, etc. Temperature sensors are not only a wide variety, but also in a variety of combinations. Suitable products should be selected according to different locations.
Principle of temperature measurement: According to the principle that the resistance value of the resistor and the potential of the thermocouple change regularly with temperature, we can get the temperature value that needs to be measured.
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