Neptune Systems PM3 Dissolved Oxygen Module

Overview

The Neptune Systems PM3 Module brings advanced dissolved oxygen monitoring to your Apex Aquarium Controller. Dissolved oxygen (DO) is one of the most critical—yet often overlooked—parameters in reef aquariums. With real-time monitoring, the PM3 allows you to protect your fish and corals from dangerously low oxygen levels by setting alerts and automating equipment like pumps and air stones when DO drops below safe levels.

Key Features

• Real-Time Monitoring – Tracks dissolved oxygen levels continuously.

• Critical Safety Alerts – Configure Apex Fusion to send notifications or trigger equipment if oxygen falls too low.

• Additional Ports – Includes an extra temperature probe port (sold separately) and I/O switch inputs for added flexibility.

• Apex Integration – Seamlessly connects via AquaBus and is compatible with all Apex systems.

• Plug & Play Setup – Automatically recognized when connected to your Apex.

• Lab-Grade Accuracy – Works with Neptune’s high-quality dissolved oxygen probe (sold separately) featuring a replaceable membrane.

• Expandable Monitoring – Add float switches, leak alarms, pressure sensors, and more through the I/O port.

Why Monitor Dissolved Oxygen?

• Fish & Coral Health – Levels below 4.5 ppm can stress livestock, and levels below 3 ppm may cause fatalities.

• Nutrient Control Systems – Methods like biopellets, carbon dosing, or nitrate reactors can rapidly deplete oxygen.

• Overstocked Systems – Extra waste and detritus consume oxygen during breakdown, creating hidden risks.

• Surface Gas Exchange – Ensures proper O2/CO2 balance and supports stable tank chemistry.

Product Specifications

• Model: PM3 Dissolved Oxygen Module

• Connections:

  • 1x Dissolved Oxygen probe port (probe sold separately)

  • 1x Temperature probe port (optional probe sold separately)

  • 6x Digital inputs for switches/sensors

  • 2x AquaBus connectors

• Features: Galvanic isolation, LED status indicator, firmware upgradable

• Compatibility: All Apex Controllers (Apex required, sold separately)

What’s Included

• Neptune Systems PM3 Dissolved Oxygen Module

• 3 ft. AquaBus Cable

Note: Dissolved Oxygen probe sold separately. Apex Controller required.