Device configured to measure the flow rate of concrete intended to flow in a pumping plant connected to a drilling machine provided with a drilling tool, said pumping plant comprising a piston motor pump and a connection pipe to lead the concrete from said motor pump to the drilling tool; said device comprising: - at least one transmitting module (4, 4a), adapted to be rigidly mounted and in a removable manner, on the pumping plant and comprising at least one accelerometer, - a receiving module, adapted to be associated with the drilling machine; wherein the transmitting module (4, 4a) is configured to detect the accelerations generated by the vibrations of the pumping plant during the pumping of the concrete, said accelerations indicating the flow rate of the concrete, and to send a signal, which is processed based on the detected accelerations, to the receiving module through wireless transmission, wherein the receiving module is configured to receive the signal from the transmitting module (4, 4a) and to send a signal indicating the flow rate of the pumped concrete based on the received signal; wherein the transmitting module (4, 4a) is configured so that, if the intensity of the accelerations detected by the accelerometer remains within detection threshold values, said accelerations are not taken into account to emit the signal generated by the transmitting module (4, 4a); wherein the transmitting module (4, 4a) is configured to analyze the intensity of the vibrations for a predetermined calibration time, during which a motor of the motor pump is in an operating condition in which said motor pump does not pump the concrete, and to determine a calibration interval which is defined by the maximum positive and negative values of the acceleration detected in the calibration time; the detection threshold values are determined based on the calibration time. - at least one transmitting module (4, 4a), adapted to be rigidly mounted and in a removable manner, on the pumping plant and comprising at least one accelerometer, - a receiving module, adapted to be associated with the drilling machine; wherein the transmitting module (4, 4a) is configured to detect the accelerations generated by the vibrations of the pumping plant during the pumping of the concrete, said accelerations indicating the flow rate of the concrete, and to send a signal, which is processed based on the detected accelerations, to the receiving module through wireless transmission, wherein the receiving module is configured to receive the signal from the transmitting module (4, 4a) and to send a signal indicating the flow rate of the pumped concrete based on the received signal; wherein the transmitting module (4, 4a) is configured so that, if the intensity of the accelerations detected by the accelerometer remains within detection threshold values, said accelerations are not taken into account to emit the signal generated by the transmitting module (4, 4a); wherein the transmitting module (4, 4a) is configured to analyze the intensity of the vibrations for a predetermined calibration time, during which a motor of the motor pump is in an operating condition in which said motor pump does not pump the concrete, and to determine a calibration interval which is defined by the maximum positive and negative values of the acceleration detected in the calibration time; the detection threshold values are determined based on the calibration time. wherein the transmitting module (4, 4a) is configured to detect the accelerations generated by the vibrations of the pumping plant during the pumping of the concrete, said accelerations indicating the flow rate of the concrete, and to send a signal, which is processed based on the detected accelerations, to the receiving module through wireless transmission, wherein the receiving module is configured to receive the signal from the transmitting module (4, 4a) and to send a signal indicating the flow rate of the pumped concrete based on the received signal; wherein the transmitting module (4, 4a) is configured so that, if the intensity of the accelerations detected by the accelerometer remains within detection threshold values, said accelerations are not taken into account to emit the signal generated by the transmitting module (4, 4a); wherein the transmitting module (4, 4a) is configured to analyze the intensity of the vibrations for a predetermined calibration time, during which a motor of the motor pump is in an operating condition in which said motor pump does not pump the concrete, and to determine a calibration interval which is defined by the maximum positive and negative values of the acceleration detected in the calibration time; the detection threshold values are determined based on the calibration time.