Abstract: Described herein are examples of devices which include low voltage level controllers having a sensor head and a control box. The sensor head includes a proximity switch that is positioned within a first aperture of the sensor head. The sensor head includes a second aperture that is removably attachable to a vessel. The control box is located remotely to the sensor head. The control box is configured to operate a dump valve of the vessel, with the dump valve being located remotely to the control box.