Neptune Systems Liquid Level Sensor

The LLS (Liquid Level Sensor) by Neptune Systems is a first-of-its-kind vertical water level sensor that provides real-time, continuous monitoring of liquid depth — not just whether a level has been reached. Designed for use with the Neptune FMM Module, the LLS helps aquarists track evaporation, dosing usage, and system stability with far greater accuracy than traditional float or optical sensors.

With Apex Fusion integration, users can visualise water level trends, receive alerts, and automate corrective actions, making the LLS a valuable addition to any ATO, dosing system, or sump monitoring setup.

LLS requires a Neptune Apex A2 or A3 Series system. Not compatible with Apex Classic (A1).

Key Features

• Continuous water level measurement in real-time

• Reports depth in centimetres and inches

• View data via Apex Fusion using graphs or visual animations

• Triggers custom alerts or actions when water levels change

• Suitable for:

  • ATO reservoirs

  • Sumps

  • AIO tanks

  • Dosing containers

  • Saltwater mixing stations

• Mounting clip included for easy installation

• Four sizes available to suit various reservoir depths

How It Works

Unlike traditional sensors that detect only whether water has reached a single point, the LLS measures the exact vertical depth of liquid at all times. This allows the Apex to:

• Track evaporation patterns

• Monitor dosing consumption over time

• Trigger alerts if water is too high or too low

• Automate top-off routines or shut off pumps

All readings are viewable in Apex Fusion as both live data and historical graphs, allowing you to easily monitor trends or detect abnormalities.

Available Sizes

• 4″ LLS Sensor – Ideal for shallow dosing containers or ATO reservoirs

• 15″ LLS Sensor – Suitable for medium-depth tanks and containers

• 23″ LLS Sensor – For larger reservoirs, AIO systems, or deeper sumps

• 35″ LLS Sensor – Designed for tall water storage containers or mixing stations

What’s Included

• 1x Neptune LLS Sensor (size selected separately)

• 1x Mounting Clip

  Note: FMM Module and Apex Controller required. Sold separately.