Neptune Systems FMM Fluid Monitoring Module

The FMM (Fluid Monitoring Module) by Neptune Systems is a versatile, multi-purpose module that expands the monitoring and automation capabilities of your Apex Controller. It features four accessory ports for flow sensors, optical sensors, leak detectors, and a dedicated DC24V accessory port, allowing you to integrate a wide range of Neptune accessories.

Whether you’re automating top-offs, tracking flow rates, or adding leak detection to your system, the FMM helps simplify and safeguard your aquarium operations.

Key Features

• 4x Sensor/Probe Ports (Flow, Optical, Leak, or Liquid Level)

• 1x DC24 Accessory Port (for PMUP or solenoid valves)

• Compatible with Apex A2 and A3 Series Controllers

• Compact design for easy mounting

• Plug-and-play with Apex Fusion integration

• Power supply input for optional DC24V accessories

Supported Accessories (Sold Separately)

Flow Sensors

• ¼” FS25

• ½” FS50

• 1″ FS100

• 2″ FS200
  Use these to track the flow rate through return lines, UV sterilisers, reactors, and more — helpful for both performance tracking and maintenance alerts.

Optical Water Level Sensors

• OS-1 Optical Sensor

• MOS Magnetic Optical Sensor
  Ideal for ATO systems, dosing container monitoring, dry-run protection, and saltwater mixing automation.

Leak Detection Sensors

• LD-1 (solid surfaces)

• LD-2 (flat stand surfaces)

• LD-3 (multi-surface, optical and reusable)
  Simply plug in up to four leak probes, position them in key areas (e.g., under the tank, sump, or plumbing), and receive alerts via Apex Fusion.

LLS – Liquid Level Sensors

• Available in lengths: 4″, 15″, 23″, 35″
  Get continuous water level readings (in centimetres and inches) for your RO reservoirs, sumps, and mixing containers. Display levels visually in Fusion and set up automated responses.

DC24 Accessories

• PMUP Utility Pump

• SV-1 Solenoid Valve
  To activate this port, a 24V DC power supply (36W) is required (sold separately).

Apex Integration

Via Apex Fusion, each connected sensor can trigger:

• Custom alerts (email, push)

• Equipment shutdowns (e.g., stop a return pump on low water level)

• Automated tasks (e.g., auto top-off, water change activation)

• Historical graphing and monitoring

Simple to install and expand as your reef system grows.

Specifications

• Sensor Ports: 4 (for flow, optical, leak, or LLS sensors)

• DC24 Accessory Port: 1 (power supply sold separately)

• Power Input: 24V DC (optional, for accessory use)

• Control Integration: Neptune Apex required (via AquaBus)

What’s Included

• 1x FMM – Fluid Monitoring Module

• 1x AquaBus Cable

  Note: Sensors, accessories, and 24V power supply sold separately. Requires a Neptune Apex Controller for operation.