Self-contained electronic system for the monitoring and continuous surveillance of purgers, valves and installations using fluids. The system is comprised of three essential elements: a multiple sensor, an electronic analyzer and an optional receiver. The sensor measures the conductivity, the pressure and temperature of the fluid. The electronic analyzer continuously controls the status (pressure, temperature) and conductivity of the fluid, supplying optical, acoustic and digital information, in situ or from a remote point, in accordance with the result of the analyzis which has been carried out. The receiver centralizes and processes the signals emitted by the analyzer. The electronic circuits of the analyzer are supplied by means of batteries which are recharged by photovoltaic cells incorporated in the equipment. The multiple probe also incorporates an ultrasonic sensor which detects ultrasounds generated in the purger or in the valve. The analyzer and the remote receiver also the corresponding electronic circuit have or the continuous surveillance of the ultrasound level. This system may be applied to the continuous surveillance and control of vapor leaks in purgers and, in general, to the control of the circulation of fluids in any installation. The system can solve the problem of the automatic inspection and continuous monitoring of energy losses in purgers, without human intervention. It considerably reduces the power consumption by detecting vapor losses simultaneously and in real time in all points of the installation.