Abstract: Device for attachment to the overflow line of an electrolytic cell, for collection of alkaline cell liquor and for concurrent interruption of electrical current flow from cell in such liquor. The device consists of a closed container having a liquor inlet in the top portion of the container and outlet in the bottom portion, with the container being divided internally by a horizontal perforated plate, for separating the incoming liquor flow stream into a multiplicity of streamlets or droplets. The device is fabricated from a non-metallic, transparent material that is resistant to the hot alkaline cell liquor, preferably polymethylpentene plastic.