Littelfuse Model 460-15-100-LLS Liquid Level Sensor 110-120V 8-Pin Plug-InLittelfuse 460 15 100 LLS Seal Leak Detector Product Description The 460 15 100 LLS is a liquid level sensor to detect the presence of conductive liquids. A probe is mounted at the desired tank level and connected to the PumpSaver. When the probe is submersed, the relays output contacts will change state as soon as the debounce time expires. The adjustable debounce timer is intended to prevent nuisance actuating due to waves or splashing in the tank.