In industrial fields such as semiconductor manufacturing, biomedicine, aerospace, etc., precise measurement and control of fluids are the key to determining product quality and production success or failure. When environmental parameters such as temperature and pressure fluctuate, traditional volumetric flow measurement methods often appear inadequate. The emergence of the Coriolis Mass Flow Controller (MFC), with its unique principle of directly measuring mass flow, has established an unshakable "gold standard" for industrial process control and become a precision "valve" in the manufacturing field.
The core mystery of the Coriolis mass flow controller originates from the Coriolis effect in physics. There is a U-shaped or straight vibrating tube inside, and when the fluid flows inside the tube, the driving system generates a small fixed frequency vibration. According to Newton's second law, a flowing fluid in a vibrating tube will generate a Coriolis force proportional to the mass flow rate, causing the vibrating tube to twist. This distorted phase difference is captured by high-precision electromagnetic sensors, and through complex algorithm calculations, the mass flow rate of the fluid can be directly and real-time obtained. The brilliance of this principle lies in the fact that the measurement results are only related to the quality of the fluid, and are almost unaffected by changes in its physical properties such as temperature, pressure, density, viscosity, etc.
A complete Coriolis mass flow controller is a closed-loop system that integrates precision measurement and intelligent control. It consists of three main parts: Coriolis mass flow sensor, control circuit, and proportional control valve. Sensors are responsible for "sensing" real-time quality flow and transmitting signals to control circuits. The control circuit is like the "brain" of the device, comparing the actual flow rate with the target value set by the user, performing fast calculations through advanced PID algorithms, and issuing instructions to the proportional valve. The proportional valve acts as the "executor", precisely opening or closing the valve to stabilize the actual flow at the set value in a very short period of time, forming a dynamically balanced precision control loop.
The advantage of the Coriolis mass flow controller lies in its precision and wide applicability. Its accuracy can usually reach ± 0.1% or even higher of the full range, and its repeatability is better than ± 0.05%, which is difficult for other types of flow meters to achieve. It does not require temperature and pressure compensation and can directly measure various media such as liquids, gases, slurries, multiphase flows, etc. It can handle everything from low viscosity solvents to high viscosity chemicals, from highly corrosive acids and bases to expensive precious metal slurries with ease. In semiconductor chip manufacturing, it precisely controls the flow of etching gas and chemicals; In the pharmaceutical industry, it ensures precise feeding of drug formulations; In the energy sector, it is used for precise trade settlement of liquefied natural gas (LNG).
With the development of Industry 4.0 and IoT technology, Koch quality flow controllers are becoming more intelligent. Modern equipment integrates digital communication functions such as Modbus and PROFIBUS, enabling remote monitoring, parameter setting, and fault diagnosis, seamlessly integrated into the factory's DCS or PLC system. At the same time, in order to meet the needs of emerging fields such as laboratories and microfluidics, miniaturized Koch flow controllers are constantly emerging, with flow measurement ranges up to micrograms per minute. In addition, the self diagnostic function and integration of multiple parameter measurements (such as density and temperature) have further enhanced the intelligence level and application value of the equipment.