The Liberty OTC-34-141 is a standalone OilTector control. It differentiates oil from water in elevator sump pits, transformer vaults, and similar applications: it activates the pump to remove only water, ignores an oil layer instead of discharging it, and alarms on a high-water or high-oil condition (ASME A17.1 compliant). Rated for three-phase power at 208-230-460V.