CORIOLIS MASS FLOW MEASURING DEVICE HAVING FOUR CURVED MEASURING TUBES

摘要

The invention relates to a Coriolis mass flow measuring device (100), comprising four curved measuring tubes (110a, 110b, 110, 110dd), two actuator arrangements (140a, 140c), and two sensor arrangements (142a-1, 142a-2, 142c-1, 142c-2). All four curved measuring tubes (110a, 110b, 110c, 110d) are fluidically combined both on the inlet side and the outlet side by a collector (120), wherein on the inlet side and on the outlet side, the measuring tubes are in each case combined in pairs by node plates (132a, 132c, 134a, 134c) to form oscillators. The actuator arrangements (140a, 140c) are designed to respectively excite bending vibration useful modes between the two measuring tubes of an oscillator, wherein the first oscillator and the second oscillator are each provided with a bending vibration useful mode having a first or a second useful mode natural frequency (f-₁₁,f₁₂), wherein the amount of the difference between the useful mode natural frequencies of the two oscillators (|f-₁₁-f₁₂|) is at least 0.1-times, for example at least 0.2-times, and in particular at least 0.4-times the lower of the two useful mode natural frequencies. The sensor arrangement is designed to detect the vibrations of the oscillators.