oil temp gauge car

• 2022-02-23

The main function of the car thermometer is to accurately measure and display the temperature in the car. It can detect your car from time to time and effectively avoid damage to the vehicle under the freezing point. With the continuous development of science and technology, at this stage, the automobile thermometer has more than a single measurement function. The automobile thermometer produced by some brands can measure the temperature inside and outside the automobile at the same time, and is equipped with warning lights and icons to remind users to check whether the battery voltage is normal, keep the battery within the normal range, and protect the vehicle volume in many ways.

working principle of oil temp gauge car

Mercury thermometer

Mercury thermometer is a kind of expansion thermometer. The freezing point of mercury is: - 39 ℃ and the boiling point is 356.7 ℃. It is used to measure the temperature within the range of - 39 ° c-357 ° C. It can only be used as an instrument for local supervision. Using it to measure temperature is not only simple and intuitive, but also can avoid the error of external remote thermometer.

Liquid crystal thermometer

Liquid crystal thermometer is mainly used for detector. It is a resistance sensor. The resistance value of metal changes with the change of temperature. For different metals, the resistance value changes differently with each degree of temperature change, and the resistance value can be directly used as the output signal.

Temperature sensor

Two types of temperature sensors are mainly used in automobiles, resistance sensor and galvanic sensor. In addition to the resistance sensor, the thermocouple consists of two metal wires of different materials, which are welded together at the end. Then measure the ambient temperature of the unheated part, and you can accurately know the temperature of the heating point. Because it must have two kinds of conductors of different materials, it is called thermocouple. Thermocouples made of different materials are used in different temperature ranges, and their sensitivity is also different. The sensitivity of thermocouple refers to the change of output potential difference when the hot spot temperature changes by 1 ℃. For most thermocouples supported by metal materials, this value is about 5 ~ 40 microvolt / ℃.