The Coriolis principle describes a force (the so-called Coriolis force) that is generated when bodies or fluids move in rotating reference systems if their movement is at an angle (not parallel) to the axis of rotation. The Coriolis force is proportional to the angular velocity of the rotating reference system and the velocity and mass of the body or fluid. This makes it possible to measure, for example, the volume flow of gas.
In Coriolis meters, actuators cause a pipe bend to vibrate. The basis of this pipe bend is its axis of rotation, its oscillating legs complete a pitch circle. These movements are caused by the flow of the gas and can be measured, which makes it possible to measure the gas volume flow. This is done by sensors mounted on the inlet and outlet side of the oscillating system. They measure the difference between different Coriolis forces when the gas flows in and out. The gas volumeter with this operating principle can also be used in hazardous areas and can be used for custody transfer measurements.
Finally, it should be noted that there are other technical principles by which a gas volumeter can measure the volume of gas. In principle, the choice of design is determined by the area of application.