Wire-mesh sensors are increasingly used for flow imaging in packed beds. In this study, a capacitance wire-mesh sensor is applied to measure the cross-sectional liquid phase distribution in a rotating fixed-bed reactor. The liquid filling level is derived as a crucial parameter defining the operational window of the reactor concept. Contrary to the standard sensor configuration, wireless data transfer and autonomous power supply is integrated. Furthermore, appropriate data processing is required to visualize the liquid flow of the three-phase system (nitrogen, cumene and gamma-Al2O3 particles).