1, at room temperature sensor: room temperature sensor is used to measure the environment of indoor and outdoor temperature, the tube temperature sensor is used to measure the tube wall temperature of evaporator and condenser. Room temperature sensor and the shape of the tube temperature sensor is different, but the temperature characteristic are basically identical. According to the temperature characteristic, the use of beauty room temperature pipe temperature sensor has two types: 1. The constant value of 4100 k B + / - 3%, benchmark resistance of 25 ℃ for sensors

The sensor

Resistance should be 10 k Ω plus or minus 3%. The higher the temperature, the smaller the resistance; The lower the temperature, the greater the resistance. The farther you go from 25 ℃, the corresponding resistor tolerance range is larger; At 0 ℃ and 55 ℃ resistance tolerance about + / - 7%; Above and below 0 ℃ and 55 ℃, for different suppliers, the resistance tolerance will have certain difference. The higher the temperature, the smaller the resistance; The lower the temperature, the greater the resistance. The farther from 25 ℃, corresponding to the greater the resistance tolerance range.

2, exhaust temperature sensor: exhaust temperature sensors used to measure the top of the compressor exhaust temperature, constant value of 3950 k B + / - 3%, corresponding resistance at 90 ℃ for 5 k benchmark resistance Ω plus or minus 3%.

3, modules, temperature sensor, temperature sensor for measuring the frequency conversion module (IGBT or IPM) temperature, the use of thermal model of the head is 602 f - 3500 - f, benchmark resistance is 25 ℃ corresponding resistance Ω 6 k + / - 1%. Several typical temperature corresponding resistance are: - 10 ℃ - (25.897 to 28.623) ─ K Ω; 0 ℃ - (16.3248 to 17.7164) ─ K Ω; ─ 50 ℃ - > (2.3262 2.5153) K Ω; 90 ℃ - Ω ─ (0.6671 0.6671) K.

Many different kinds of temperature sensor, now often use a thermal resistance: PT100, PT1000, Cu50, Cu100; Thermocouple: B, E, J, K, S, etc. Temperature sensor not only sort is various, and combination of various forms, should choose suitable products according to different places.

Temperature measuring principle: according to different resistance resistance, electric potential with the temperature of thermocouple regular changes in principle, we can get the need to measure the temperature.