Effects of previous disturbances on the meter factors of a vortex meter

Pulsations (100 to 120 dB) generated by a pressure chamber amplifier are studied to determine their effects on the vortex meter. The vortex meter is disturbed when the pulsating frequency is in phase with the vortex cavitation frequency. Perturbations in the velocity profile through curvatures and slide valves lead to meter factor displacement. The residual angular momentum vectors behind a bundle of pipes and behind the aperture plates are in opposite directions. The effects of a chamber curvature without and with the installation of a rectifier are presented. Gas density indicators are used to study the gas type influence with a bifurcated oscillator and a pipe oscillator. The pressure differences depend on the oscillating and sonic velocity and on the gas density. The gas type influence can be corrected by reducing the oscillating velocity of the structure and by applying the error difference of two density indicators with differential oscillating velocity.