Process of flow rate test performed by an inspection device for fluid circulation circuits; the inspection device comprising: - A user interface module, comprising a hardware configured to provide interaction with a user for operating the device; a connection with external communication networks or with external data storage devices; - A hydraulic module, which includes all the components that promote fluid circulation inside the device in order to accomplish inspection in a controlled manner according to what has been set by the user at the user interface module; the hydraulic module consisting of the following components: servo-controlled solenoid valves, and level, pressure, temperature and flow rate sensors, internal filter, inspection liquid tank and hydraulic pump; the inspection liquid tank being located inside the inspection device and having a filling system which connects it to the outside; - An electrical switchboard module, which includes a power supply, electrical components for power transmission, electronic components for logic and communication processing, electronic protection components, digital and analog signal processing components and power supply to the hydraulic module components; the electrical switchboard module being further configured to execute a control algorithm adapted to control the components of the hydraulic module according to an actuation sequence and to user instructions; - A filtering module, which comprises a filter for medium/large sized particles and a filter for small sized particles; - A frame module, adapted to support the user interface module, the hydraulic module, the electrical switchboard module and the filtering module; it comprises an internal structural frame and a set of outer plates, and within which the hardware, emergency push button, on/off button, light indicators, plug of the device power supply and moving wheels are incorporated; and the process being characterized by the following steps: a) cleaning of a circuit to be inspected, followed by an inspection stage if no anomalies are found, neither leaks nor clogging; b) adjustment of a pressure value to an inspection test setting; c) monitoring both pressure and flow rate values of a fluid circulating inside the circuit; d) acquisition of the signals received by the device sensors and recorded in a database; e) information processing; f) automatic and real-time generation of a report. - A user interface module, comprising a hardware configured to provide interaction with a user for operating the device; a connection with external communication networks or with external data storage devices; - A hydraulic module, which includes all the components that promote fluid circulation inside the device in order to accomplish inspection in a controlled manner according to what has been set by the user at the user interface module; the hydraulic module consisting of the following components: servo-controlled solenoid valves, and level, pressure, temperature and flow rate sensors, internal filter, inspection liquid tank and hydraulic pump; the inspection liquid tank being located inside the inspection device and having a filling system which connects it to the outside; - An electrical switchboard module, which includes a power supply, electrical components for power transmission, electronic components for logic and communication processing, electronic protection components, digital and analog signal processing components and power supply to the hydraulic module components; the electrical switchboard module being further configured to execute a control algorithm adapted to control the components of the hydraulic module according to an actuation sequence and to user instructions; - A filtering module, which comprises a filter for medium/large sized particles and a filter for small sized particles; - A frame module, adapted to support the user interface module, the hydraulic module, the electrical switchboard module and the filtering module; it comprises an internal structural frame and a set of outer plates, and within which the hardware, emergency push button, on/off button, light indicators, plug of the device power supply and moving wheels are incorporated; a) cleaning of a circuit to be inspected, followed by an inspection stage if no anomalies are found, neither leaks nor clogging; b) adjustment of a pressure value to an inspection test setting; c) monitoring both pressure and flow rate values of a fluid circulating inside the circuit; d) acquisition of the signals received by the device sensors and recorded in a database; e) information processing; f) automatic and real-time generation of a report.