Coriolis mass flowmeter measurement part is mainly composed of elastic sounding pipe, vibration unit, the unit of vibration picking closed-loop self-excited amplification and other components of the unit, working principle is: the elastic vibration unit to maintain sensitive structure is given priority to with elastic sounding pipe in a state of resonance, "bending vibration measurement tube; When the mass flow rate through the vibration of the measuring tube, the coriolis effect "made by sounding pipe on the basis of the above" vibration ", directly related to the flow of "mass flow" vice vibration "reverse"; By detecting the measuring tube "complex vibration can directly get the fluid mass flow rate, obviously, the coriolis mass flowmeter can be stable, reliable work, the key is to ensure that in the vibration of the ideal state, namely in the practical application to curb or minimize its influence,
In mass flowmeter installation process, if the flowmeter sensor flange and pipe at the center of the shaft not aligned (that is, the sensor flange and pipe flange is not parallel) or pipe temperature change, pipe stress generated by the formation pressure, torque, pull to the mass flowmeter measurement tube, cause the asymmetry or deformation of test probe, which can lead to zero drift, cause measurement errors, then we will need to pay attention to the following two aspects:
(1) meter installation strictly abide by the norms,
(2) after the installation of the flow meter, bring up the menu "zero" default, and record producer zero zero after looking at zero value at this time, if the differences between the two values (two values to ensure an order of magnitude), then install the stress is larger, should be reinstalled,
