This invention refers to a robust low cost wireless sensor with an internal battery that permits operation for extended periods without the necessity of maintenance, for monitoring the flow of particulate solid material such as chemical fertilizers, small seeds, granulated foodstuffs, and others, where such flow is generated by mechanical action, gravity or by pneumatic pressure, as used in equipment or machines found in various sectors such as agriculture and livestock, foodstuffs, civil construction, plastics, etc., although mainly in agricultural machinery, the main purpose of which is to monitor flow within the conduits that conduct particulate material during the operation of equipment and/or machines, and to alert the operator where the flow is irregular or interrupted, which consists of a rigid resonant conductor (1) that comprises a circular support (3) which fits to supports (4) that secure the transducers (5) to the external face of a rigid conductor (1), which is provided with internal batteries (7) which supply power to the flow sensor and electronic circuit board (6) provided with a radiofrequency transceiver for sending data which results in a completely wireless particulate solid material flow sensor.
