What kind of car thermometer are there?

The main function of the automobile thermometer is accurate measurement and display the temperature inside the car, can always test your car, effectively avoid under freezing damage to vehicles. With the continuous development of science and technology, the present automobile thermometer has not only have a single measurement of function, some brand production car thermometer can have the measurement function of automotive internal and external temperature, and equipped with warning lights and icon can prompt the user to check the battery voltage is normal, keep the battery normal range, etc. , protect the car quantity in many aspects. Automotive: the kinds of thermometer thermometer has 3 kinds, respectively is: 1, auto paste type cold light within mercury thermometer 2, 3 car vehicle-mounted LCD thermometer temperature probe and the car with the working principle of the temperature sensor of automobile thermometer, mercury thermometer mercury thermometer is a kind of expansion type thermometer, mercury freezing point is: - 39 ℃, boiling point is: 356. 7 ℃, which is used to measure - 39° C— 357° C within the range of temperature, it can only be as on-site monitoring instrument. Use it to measure temperature, not only is simple and intuitive, but also can avoid external remote transmission error of the thermometer. LCD LCD thermometer is mainly used for probe thermometer for resistance sensors, metal with temperature change, its resistance value is changing. For different metal temperature every once, resistance change is different, and resistance value can be directly as the output signal. Temperature sensor motor mainly used two types of temperature sensors, sensor and thermocouple sensor. In addition to the resistance sensor, thermocouple is composed of two different materials of metal wire, at the end welded together. To measure the heating part of the environment temperature, can accurately know the temperature of the hot spots. Because it must have two different material of the conductor, so called the thermocouple. Different material to make the thermocouple used in different temperature range, their sensitivity is also each are not identical. The sensitivity of thermocouple refers to add 1 ℃ hot spot temperature changes, the output variation of potential difference. For most of the metal material support thermocouple, this value about between 5 ~ 40 microvolt / ℃. Automobile thermometer installation method: 1, for mercury thermometer paste inside the car, using the method is simple, as long as the thermometer on the instrument desk or other appropriate places does not affect the operation of driving. 2, auto car LCD thermometer temperature probe. Such vehicle is equipped with the car more than exogenous temperature probe thermometer, need the car plug into car cigarette hole thermometer for car, the parts temperature sensor installed at the edge of the door, after starting the car show and use, temperature measurement sampling cycles are usually about 20 seconds. 3. Temperature sensor, car factory installed for intake and exhaust and the status of the cooling liquid, etc.