Patent ID: 7134348

Claim:
A method for operating a mass flowmeter employing the Coriolis principle, said mass flowmeter incorporating a measuring tube through which flows a medium and which is stimulated into oscillating at a minimum of one frequency, whereupon the resulting oscillations of the measuring tube are detected and measured, wherein he viscosity of the medium flowing through the measuring tube is determined on the basis of the pressure drop along the measuring tube and said pressure drop is determined as a function of the dynamic pressure by applying the formula Δ ⁢ ⁢ p = C w · P s ⁢ L d , where Δp represents the pressure drop along the measuring tube, C w is the coefficient of friction which in particular for laminar flows is derived via 64/Re with the Reynolds' number Re, P s is the dynamic pressure, L is the length of the measuring tube and d is the diameter of the measuring tube.