8A1B

The measuring system operates on the principle of Coriolis force measurement. Coriolis force is the force experienced by an object moving linearly within a rotating system. Fc = 2 · ∆m (ν · ω) Fc = Coriolis force ∆m = mass of the moving object ω = angular velocity ν = radial velocity of the object in a rotating or vibrating system The magnitude of the Coriolis force depends on the mass Δm of the moving object and its radial velocity v, i.e., the mass flow. The sensor uses the vibration of the measuring tube instead of the constant angular velocity ω of a rotating system. The fluid flows through the sensor; inside the sensor, two parallel measuring tubes vibrate in opposite directions, similar to a tuning fork. Coriolis forces are generated in the measuring tubes, causing a phase difference in their vibration: • When the flow rate is zero (fluid is stationary), the two measuring tubes vibrate in phase, with no phase difference. • Mass flow causes the measuring tubes to accelerate at the inlet and decelerate at the outlet, creating a phase difference. The greater the mass flow, the greater the phase difference. Electromagnetic phase sensors record the vibration phase at the inlet and outlet of the measuring tubes. The system balance is ensured by the opposite-phase vibration of the two measuring tubes. The measuring principle is completely independent of temperature, pressure, viscosity, conductivity, and fluid characteristics.

Low flow measurement

The Promass A mass flowmeter is used for precise measurement of small flows of liquids and gases in high-pressure and low-pressure applications. Combined with the smallest available transmitter, Promass A 100 flowmeter is ideal for minimum flow measurement, making it the first choice for system integrators, skid equipment manufacturers, and other equipment manufacturers. The Promass A 100 features an ultra-compact stainless steel hygienic housing, installable in confined spaces. • Coriolis measuring principle independent of fluid physical properties (e.g., viscosity and density) • Precise measurement of small flows in continuous processes of liquids and gases