A contactor includes a housing having a chamber, a liquid media with a first fluid and a second fluid within the chamber and insoluble with each other, a conductive plate, a first terminal, a second terminal, and a mixing unit. The conductive plate is at an upper portion of the housing and is electrically connected to a lower portion of the housing. The first terminal is electrically connected with the chamber. The second terminal is connected to the lower portion. The mixing unit switches the liquid media between a mixed state and an unmixed state. In the mixed state, the fluids are mixed with each other to establish an electrical path between the terminals. In the unmixed state, the fluids are separated and immiscible with each other to disrupt the electrical path between the terminals.

A contactor includes a housing having a chamber, a liquid media with a first fluid and a second fluid within the chamber and insoluble with each other, a conductive plate, a first terminal, a second terminal, and a mixing unit. The conductive plate is at an upper portion of the housing and is electrically connected to a lower portion of the housing. The first terminal is electrically connected with the chamber. The second terminal is connected to the lower portion. The mixing unit switches the liquid media between a mixed state and an unmixed state. In the mixed state, the fluids are mixed with each other to establish an electrical path between the terminals. In the unmixed state, the fluids are separated and immiscible with each other to disrupt the electrical path between the terminals.