Capacitive separator device adapted to separate gases and two liquid phases, the two liquid phases being hydrocarbon and water, the capacitive separator device comprising: - a body with an upper threaded opening, a lateral threaded opening, a fluid inlet adapted for the introduction of a fluid to be separated, and at least three outlet means (5, 6, 8) adapted for the outflow of gases, hydrocarbon and water, respectively, the fluid inlet comprising an inflow opening located below the hydrocarbon outlet means and above the water outlet means; - a tank defined in the body, - a first oscillator circuit, which comprises at least one hydrocarbon measurement condenser that comprises the tank walls acting as a conductor, hydrocarbon acting as a dielectric, and a hydrocarbon probe fixed on the upper threaded opening, which reaches the interior of the tank, acting as a hydrocarbon measurement conductor, adapted to generate a hydrocarbon level signal, - a second oscillator circuit, which comprises at least one water level measurement condenser that comprises the tank walls, acting as a conductor, water acting as a dielectric, and a water probe fixed on the lateral threaded opening, which reaches the interior of the tank, acting as a second water measurement conductor, adapted to generate a water level signal, - a first reference oscillator circuit in parallel with the second oscillator circuit, which, in turn, comprises a reference hydrocarbon condenser adapted to generate a reference hydrocarbon level signal, - a second reference oscillator circuit in parallel with the first oscillator circuit, which, in turn, comprises a reference water condenser adapted to generate a reference water level signal, - a water level measurement module in charge of receiving the water signals (27, 28), connected to a water outlet control module that acts on the water outlet means, and - a hydrocarbon level measurement module in charge of receiving the hydrocarbon signals (25, 26), connected to a hydrocarbon outlet control module that acts on the hydrocarbon outlet means. - a body with an upper threaded opening, a lateral threaded opening, a fluid inlet adapted for the introduction of a fluid to be separated, and at least three outlet means (5, 6, 8) adapted for the outflow of gases, hydrocarbon and water, respectively, the fluid inlet comprising an inflow opening located below the hydrocarbon outlet means and above the water outlet means; - a tank defined in the body, - a first oscillator circuit, which comprises at least one hydrocarbon measurement condenser that comprises the tank walls acting as a conductor, hydrocarbon acting as a dielectric, and a hydrocarbon probe fixed on the upper threaded opening, which reaches the interior of the tank, acting as a hydrocarbon measurement conductor, adapted to generate a hydrocarbon level signal, - a second oscillator circuit, which comprises at least one water level measurement condenser that comprises the tank walls, acting as a conductor, water acting as a dielectric, and a water probe fixed on the lateral threaded opening, which reaches the interior of the tank, acting as a second water measurement conductor, adapted to generate a water level signal, - a first reference oscillator circuit in parallel with the second oscillator circuit, which, in turn, comprises a reference hydrocarbon condenser adapted to generate a reference hydrocarbon level signal, - a second reference oscillator circuit in parallel with the first oscillator circuit, which, in turn, comprises a reference water condenser adapted to generate a reference water level signal, - a water level measurement module in charge of receiving the water signals (27, 28), connected to a water outlet control module that acts on the water outlet means, and - a hydrocarbon level measurement module in charge of receiving the hydrocarbon signals (25, 26), connected to a hydrocarbon outlet control module that acts on the hydrocarbon outlet means.