Coriolis mass flowmeter is a type of flowmeter that measures the mass flow rate of a fluid flowing through a pipe. The principle of operation is based on the Coriolis effect, which is a phenomenon that occurs when a fluid or object is moving in a rotating reference frame.

The Coriolis mass flowmeter consists of a straight, vibrating tube that is mounted in the flow path of the fluid. When the fluid flows through the tube, it causes the tube to vibrate at a certain frequency. Two sensors located at opposite ends of the tube measure the frequency of vibration and the phase shift between them.

As the fluid flows through the tube, it experiences a Coriolis force due to the rotation of the tube. This force causes the tube to twist slightly, and the degree of twist is directly proportional to the mass flow rate of the fluid. The sensors detect the change in frequency and phase shift caused by the twisting of the tube and use this information to calculate the mass flow rate of the fluid.

Coriolis mass flowmeters are highly accurate and can measure the mass flow rate of fluids with high viscosity, density, and corrosiveness. They are commonly used in industries such as chemical, pharmaceutical, and food processing, where precise measurement of fluid flow is essential.