Neptune Systems PM3 Dissolved Oxygen Module
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Neptune Systems PM3 Dissolved Oxygen Module – Keep Your Tank Breathing
The Neptune Systems PM3 Dissolved Oxygen Module adds continuous dissolved oxygen monitoring to your Apex system. For reef keepers who already rely on Neptune Systems controllers to automate and monitor their aquariums, this module ensures oxygen never becomes an afterthought.
Why the Neptune Systems PM3 Dissolved Oxygen Module Matters
Oxygen levels can change faster than a baseball score in the ninth inning. Additives that fuel nutrient control—like carbon dosing or biopellets—can strip oxygen overnight. By adding the PM3 and probe (sold separately), hobbyists gain real-time data and alerts before corals or fish show stress.
This module also fits seamlessly into the Probes category, giving aquarists flexibility. The open port for an additional temp probe and I/O switch inputs means it does more than just track O₂—it works like a multi-tool for system safety.
Key Features of the Neptune Systems PM3 Dissolved Oxygen Module
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Monitors dissolved oxygen in real time
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Includes an extra temperature probe port (probe sold separately)
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Six digital inputs for float switches, leak alarms, or feed buttons
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Plug-and-play design for quick Apex integration
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Two AquaBus connectors with included 3-foot cable
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Galvanic isolation ensures accurate probe readings
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Upgradeable firmware with LED status indicator
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Fully compatible with all Apex systems
Understanding Dissolved Oxygen Levels in Reef Tanks
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Recommended levels: 4.5–7 ppm
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Stress often starts below 4 ppm
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Fatalities can occur if oxygen dips below 3 ppm
At 78.8°F and 35ppt salinity, maximum oxygen saturation is 6.64 ppm. In most reef aquariums, maintaining 70% saturation keeps animals thriving. The PM3 makes it easy to see when levels begin to drift.
Frequently Asked Questions About the Neptune Systems PM3 Dissolved Oxygen Module
Does the PM3 work with all Apex systems?
Yes, the module connects through AquaBus and is automatically recognized.
Is the dissolved oxygen probe included?
No, the probe is sold separately, allowing users to choose the setup that fits their system.
Can I add more sensors with the PM3?
Absolutely. The module includes inputs for float switches, leak sensors, and other breakout box accessories.
How often should I replace the probe membrane?
Most aquarists replace membranes annually, depending on usage. Each replacement is inexpensive and straightforward.
What if my tank runs low on oxygen?
With PM3 monitoring, Apex can trigger pumps, air stones, or alerts via email and text before levels become dangerous.
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