| 摘要 |
A method for operating a Coriolis mass flowmeter in which the interferences when calculating the medium parameters is considered by the eigenfrequency (f01) of the oscillation of the measuring tube being determined in the first and second natural modes during operation of the Coriolis mass flowmeter, and at least one medium parameter ({dot over (m)}) is calculated with the aid of the oscillation measuring variable (Δt) by means of a calculation rule representing a mathematic relation between the oscillation measuring variable (Δt), the medium parameter ({dot over (m)}) and the eigenfrequencies (f01, f02) of the oscillations of the measuring tube in the first natural mode and the second natural mode, and the medium parameter ({dot over (m)}) being determined taking into consideration the current determined eigenfrequencies (f01, f02) of the oscillations of the measuring tub in the first natural mode and the second natural mode as well as the oscillation measuring variable (Δt). |
| 主权项 |
1. Method for operating a Coriolis mass flowmeter having at least one electric setting device, at least one electric drive forming an oscillation generator, at least one measuring tube interacting with a medium and having at least one oscillation sensor, comprising the steps of:
using the electric setting device to provide an electric excitation signal for exciting the electric drive, using the electric drive to excite the measuring tube into oscillation in at least one first natural mode, detecting the excited oscillation of the measuring tube with the oscillation sensor as an oscillation measuring variable (x, {dot over (x)}, Δt) and calculating at least one medium parameter ({dot over (m)}) with the aid of the oscillation measuring variable (Δt) by means of a calculation rule, wherein a first eigenfrequency (f01) of the oscillation of the measuring tube is determined in the first natural mode during operation of the Coriolis mass flowmeter, wherein a second eigenfrequency (f02) of the oscillation of the measuring tube is determined in at least one second natural mode during operation of the Coriolis mass flowmeter, wherein the calculation rule represents a mathematic relation between the oscillation measuring variable (Δt), the medium parameter ({dot over (m)}) and the first and second eigenfrequencies (f01, f02) of the oscillations of the measuring tube in the first and second natural modes, and wherein the medium parameter ({dot over (m)}) is determined taking into consideration current determined eigenfrequencies (f01, f02) of the oscillations of the measuring tube in the first and second natural modes as well as the oscillation measuring variable (Δt). |
