Neptune Systems MOS Magnetic Optical Sensor – APEX Auto Top-Off Level Control

🧪 Product Overview

The Neptune Systems MOS (Magnetic Optical Sensor) is a compact, highly accurate water level sensor designed for use with Neptune APEX systems. Ideal for auto top-off (ATO) and water level detection, it utilizes an optical sensor housed in a magnetic bracket for secure, no-slip mounting. The MOS sensor integrates easily with your FMM (Fluid Monitoring Module) and APEX Fusion to trigger alerts or control dosing and top-off systems with precision and reliability.

✨ Key Features and Benefits

• Accurate Optical Detection – Uses infrared sensing for precise water level monitoring
• Magnetic Mounting – Strong magnet keeps sensor securely in place without suction cups
• Compact Design – Slim profile fits easily in sumps and tight compartments
• APEX Compatible – Seamless integration with Neptune APEX and FMM module
• Ideal for ATO Systems – Automatically manages top-off pumps and water levels

📦 What’s Included

• 1x Neptune Systems Magnetic Optical Sensor (MOS)
• Magnetic mounting bracket (two-part design)
• Pre-wired sensor cable
• Instruction manual

🛠️ How to Use

1. Attach the MOS sensor using the included magnetic bracket inside your sump or reservoir

2. Plug into a compatible FMM module

3. Configure your water level rules or alerts in APEX Fusion

4. Use with ATO pumps or solenoids to automate water replenishment

5. Clean the optical sensor regularly for optimal performance

📐 Specifications

• Sensor Type: Infrared optical
• Mount Type: Magnetic bracket (safe for glass/acrylic)
• Cable Length: Approx. 5 ft
• Compatibility: Neptune APEX and FMM module
• Application: Auto top-off, sump monitoring, emergency water level alerts

✅ Conclusion

The Neptune Systems MOS Magnetic Optical Sensor is the perfect tool for reliable and precise water level management in reef aquariums. With strong magnetic mounting and APEX compatibility, it ensures stable, hands-free automation for your ATO or monitoring system.