D8CB

The measuring system operates on the Coriolis measuring principle. The Coriolis force is the force acting on an object moving in a straight line within a rotating‑motion 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 the rotating or oscillating system The magnitude of the Coriolis force depends on the mass \(\Delta m\) of the moving object and its radial velocity v, i.e. the mass flow rate. The sensor uses oscillating measuring tubes instead of the constant angular velocity \(\omega\) of a rotating system.Fluid flows through the sensor. Two parallel measuring tubes inside the sensor oscillate in antiphase, similar to a tuning fork. Coriolis forces are generated in the measuring tubes and produce a phase shift in their oscillation: • At zero flow (fluid at rest), both measuring tubes oscillate in‑phase with no phase difference. • Mass flow causes the measuring tubes to oscillate faster at the inlet and slower at the outlet, generating a phase shift.The higher the mass flow rate, the larger the phase shift. Electromagnetic phase sensors record the oscillation phase at the inlet and outlet of the measuring tubes. Antiphase oscillation of the two measuring tubes ensures system balance. The measuring principle is completely independent of temperature, pressure, viscosity, electrical conductivity and fluid properties.

Compressed‑natural‑gas fuelling

With the continuous expansion of the natural gas market, compressed natural gas has long become an alternative fuel for transport vehicles and is also regarded as the cleanest fuel for combustion engines. The new CNGmass is specially designed for dispensers. This Coriolis mass flowmeter delivers mass‑flow measurement with the highest accuracy, independent of pressure and temperature. • The Coriolis measuring principle is unaffected by fluid physical properties such as viscosity and density • Precise measurement of compressed natural gas (CNG) in high‑pressure fuelling applications