This publication presents the measurement data, including temporal signal changes at measuring points, and validation data, including gas and liquid flow rate measurements, absolute pressure, pressure losses, and temperature, used for the development and investigation of an Optical Channel Body Flow Sensor (OCBFS). The sensor is designed for the simultaneous measurement of gas and liquid flow rates. Experimental validation of the OCBFS was conducted across a range of superficial velocities, with liquid velocities between vl,s = 0.14 0.31 m/s and gas velocities between vg,s = 0.015-0.95 m/s. The results showed deviations of less than 10% from reference values, confirming the sensor’s accuracy and reliability in measuring gas flow rates