Neptune Liquid Level Sensor - 4 Inch Neptune Liquid Level Sensor - 4 Inch is a compact Apex liquid-depth sensor for monitoring small reservoirs, additive containers, small sumps, and ATO containers through an available FMM port. 4 Inch LLS for Small Reservoir Monitoring The 4 inch Liquid Level Sensor is the smallest LLS size in Neptune’s lineup, making it useful where a taller sensor would not fit. It can help track how much liquid remains in a dosing container, small ATO reservoir, compact sump section, or other small liquid-holding container connected to a compatible Apex system. Neptune 4 Inch LLS Features Measures liquid depth in inches or centimeters through Apex Fusion Connects to any available FMM port or compatible built-in FMM input Useful for additive reservoirs, small ATO containers, compact sump sections, and small water-storage containers Patented resistive sensing technology measures the liquid level along the sensor strip Accurate to about two-tenths of an inch once calibrated Can help confirm whether dosing containers are being depleted as expected Includes a mounting clip for attaching the sensor to a sump, reservoir, container, or baffle 4 Inch Liquid Level Sensor Specifications Product type: Apex liquid level sensor Sensor length: 4 inches Connection: FMM accessory port Measured output: Liquid depth in inches or centimeters Accuracy: About 0.2 inch after calibration Common applications: Additive containers, small ATO reservoirs, small sump sections, and compact liquid containers Required hardware: Neptune FMM or compatible Apex FMM port Compatibility and Installation Notes The LLS sensor is intended to measure liquid depth, but the sensor head should not be fully submerged. Choose the correct sensor length so the maximum liquid level stays below the uppermost graduation mark. The sensor can be used with aquarium water, RO/DI water, common reef additives, kalkwasser, and other compatible aquarium liquids listed by Neptune. Setup Directions Mount the sensor vertically using the included clip, connect it to an available FMM port, then configure and calibrate it in Apex Fusion. Place the sensor where the liquid level changes predictably and where bubbles, splashing, residue, or container movement will not interfere with readings. Test the reading and alerts before relying on it for reservoir or dosing monitoring. What's Included Neptune Liquid Level Sensor - 4 Inch Mounting clip
