Neptune OS-1 Optical Level Sensor
Reliable Infrared Water Level Detection for Your Aquarium

The Neptune Optical Level Sensor (OS-1) offers precise, real-time monitoring of water levels in your aquarium system. This compact sensor uses reflected infrared light to detect changes in state from wet to dry (or vice versa), providing reliable level detection and triggering alerts or actions via your Apex controller.

Simply connect it to your FMM module and configure it for a range of applications — from automatic top-off systems to sump high-level warnings.

Key Features of the Neptune OS-1 Sensor

Connects directly to your FMM Module

Uses reflected infrared light for accurate detection

Detects wet-to-dry and dry-to-wet transitions

Ideal for ATO systems, sump high-water alerts, and water storage monitoring

Includes fastening nut and silicone washer for secure installation

Cable length: 3 meters

Sold individually

Perfect for Multiple Aquarium Applications

Custom Automatic Top-Off (ATO) Systems

High-Level Warning Sensor in Sumps

Water Storage or Reservoir Level Monitoring

Leak prevention safeguards

Durable, accurate, and easy to install, the Neptune OS-1 Optical Level Sensor is an essential addition to any modern reef-keeping setup.