Neptune Liquid Level Sensor 23"

Accurate Liquid Level Monitoring for Larger Sumps & Water Reservoirs

The Neptune Liquid Level Sensor (LLS-23) provides reliable, real-time water depth monitoring for larger sumps, ATO reservoirs, and dosing containers. View water levels in inches or centimeters via your Apex Fusion app — helping you maintain aquarium stability and avoid costly issues from water loss or overflow.

Key Features & Benefits

• Measures liquid depth in inches or centimeters

• Ideal for larger sump return sections, tall ATO reservoirs, and additive containers

• Track water levels remotely through Apex Fusion

• Patented resistive sensing for precision and long-term reliability

• Mounting clip included for easy installation

• Compatible with A2 Apex (with FMM) and A3 Apex systems

• 3-meter cable for versatile placement

How It Works

The sensor detects liquid levels via a protected sensing material housed inside a slim sheath. As water contacts the sensor, it reports the precise depth to your Apex controller — visible instantly via the Fusion dashboard.

Installation & Compatibility

Simply mount the 23” LLS sensor to your sump, ATO reservoir, or other water-holding container using the supplied clip. Designed for systems needing accurate monitoring in deeper water columns.

Compatibility:
✔️ A2 Apex (with FMM module)
✔️ A3 Apex (via embedded FMM ports)

Not compatible with A1 Apex Classic systems.

Best Uses

• Monitor large sump return pump sections

• Track water levels in tall ATO reservoirs

• Double-check additive or kalkwasser solution levels

• Ideal for roller mat sumps and water change reservoirs

Sensor Responsiveness & Accuracy

• Responds to water level changes at ~15 seconds per inch

• Accurate to ~0.2 inches once calibrated
  Not intended for immediate control functions like auto-top-off switches