重点词汇 247/5000 翻译 通用场景 Thermal mass flowmeter adopts the principle of thermal diffusion, and thermal diffusion technology is a technology with excellent performance and high reliability under harsh strips. Typical sensing elements include two thermoelectric (platinum RTDS), a speed sensor and a temperature sensor that automatically compensates for gas temperature changes. When the two RTDS are placed in a medium, where the velocity sensor is heated to a constant temperature above the ambient temperature, the other temperature sensor is used to sense the medium temperature. The mass flow of gas through the velocity sensor is calculated by the heat transfer of the sensor element. As the gas flow rate increases, the heat carried away by the medium increases. The temperature of the sensor decreases accordingly. In order to maintain a constant temperature, the working current through the sensor must be increased, and the increased part of the current is proportional to the flow rate of the medium.