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Neptune Systems

A3 Apex Pro Aquarium Controller System

In stock
Out of stock
SKU
251343
Rating:
87% of 100
13  Reviews Add Your Review
$989.99 $989.99

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Details
 

Overview

 
Neptune Systems A3 Apex Pro

Monitor. Protect. Automate.

The A3 Apex Pro is a complete aquarium monitoring and control system built to help prevent equipment failures, catch problems early, and make day-to-day reefing less stressful. Track key parameters, control connected devices, and get notified when something needs attention.

Monitoring

  • Track temperature, pH, and ORP with included lab-grade probes
  • Continuous water level monitoring and leak detection with LLS and LD-3 sensors
  • View trends and history inside the Apex Fusion dashboard

Protection & Alerts

  • Automatically turn outlets on or off based on water parameters, sensors, or even time/day of the week
  • Email and/or push notifications when something needs your attention
  • Built-in audible alarm for immediate local alerts

Control & Expansion

  • Control Neptune Systems equipment like DOS and COR pumps, Trident testers, and more
  • Also compatible with select non-Neptune equipment from top brands like EcoTech Marine, AquaIllumination, Sicce, and Kessil
  • Backwards compatible with legacy Apex modules
 

Inside the A3 Apex Pro

 
A3 Apex Pro Base Unit +
 

The brains of the operation with the most complete monitoring and control experience in the Apex ecosystem.

  • 4 FMM ports
  • 2 variable speed 0-10V ports (2 channels each)
  • I/O port - 6 switch digital inputs
  • 2 AquaBus ports
  • 2 pH/ORP probe ports, 1 temperature probe port, 1 salinity probe port*
  • WiFi and Ethernet compatible
  • Soft-touch finish and built-in audible alarm

*Salinity probe sold separately.

Energy Bar 832 +
 

Purpose-built aquarium power control with per-outlet power monitoring, expansion ports, and accessory outputs.

  • ETL/UL certified specifically for aquarium use
  • 8x 120VAC outlets
  • Per-outlet power monitoring (watts/amps) with outlet status indicators
  • 3x 1LINK outputs for WAV, DOS, and more
  • 2x DC24V outputs for accessories (PMUP, solenoids, fans)
  • 3x AquaBus ports for expansion
Liquid Level Sensor (LLS) +
 

A continuous sensor that reads the exact depth of liquid in inches or centimeters.

  • Continuous depth measurement rather than simple on/off detection
  • Use in sumps, ATO reservoirs, AIO tanks, dosing containers, mixing stations
  • Set alerts or actions when level changes by a specified amount
  • Digital and visual readouts in the Fusion app
LD-3 Optical Multi-Surface Leak Sensor +
 

A reliable optical leak detector that works on nearly any surface.

  • Reusable and resistant to corrosion after saltwater contact
  • Works on multi-surface placements (including metal) without false alarms
  • Reliable early warning to help prevent damage to your aquarium or home
Three High-Quality Probes Included +
 

Monitor temperature, pH, and ORP right out of the box.

  • Includes temperature, pH, and ORP probes
  • Double-junction pH/ORP probes help maintain stable readings
  • Easy, guided calibration steps in Apex Fusion.
  • Salinity probe also available (sold separately)
Upgrades & Add-Ons +
 

The Apex ecosystem is designed to grow with your tank. Start with monitoring and control, then add Neptune accessories over time to build a system that matches your goals.

For Example:

  • Add automated testing with the Trident ACM or Trident NP
  • Set up automated dosing or water changes with the DOS QuietDrive
  • Add Additional modules and energy bars to support multiple aquariums with one Apex
Backwards Compatible +
 

If you already own Apex modules, energy bars, or other compatible accessories, they can work with the A3 Apex controllers.

  • Compatible with both existing and legacy Apex modules and accessories
Apex Fusion Interface+
 

Apex Fusion is a web-based command center for monitoring, alerts, and automation. Customize the dashboard with drag-and-drop tiles and check in from nearly any device.

Set reminders, log testing and dosing information, and keep tabs on your aquarium from anywhere.

  • Web-based interface with dashboards, graphs, and tiles
  • Alerts help you respond to small issues before they become big problems
  • Apex Fusion app is compatible with iOS and Android devices
 

Featured Video

 
 

Specifications

 

A3 Apex Pro Base Unit

FMM Ports 4
0–10V Outputs 4 Channels
Switch Inputs 6
AquaBus Ports 2
Probe Ports 2 pH/ORP, 1 Temperature, 1 Salinity*
Networking WiFi & Ethernet
Alarm Built-In Audible Alarm
Dimensions 4.75" L x 3.25" W x 5.25" W
*Salinity probe sold separately.

Energy Bar 832

120VAC Outlets 8
1LINK Ports 3
DC24V Accessory Ports 2
AquaBus Ports 3
Certification ETL/UL Certified For Aquarium Use
Dimensions 10" L x 2.25" W x 6.5" H
 

What’s Included

 
 
A3 Apex Pro Base UnitMain brain of the controller for monitoring, automation, and alerts
 
Energy Bar 832Smart control with power monitoring for each outlet
 
LD-3 Leak Detection SensorReusable optical leak detection sensor for almost any surface
 
Liquid Level Sensor (LLS)Continuous water level depth monitoring in inches or centimeters
 
Temperature ProbeTrack temperature trends and control  connected heating or cooling devices
 
pH ProbeLab-grade double-junction probe for reliable pH readings
 
ORP ProbeORP probe to monitor your system's ability to break down waste
Also Included
6' AquaBus Cable
pH Calibration Solutions (7 & 10)
Mounting Screws
Getting Started Card
More Information
More Information
SKU 251343
UPC 653078004861
Aquarium Type Saltwater, Freshwater
Apex Compatible No
Dimensions 4.75" L x 3.25" W x 5.25" W
What it Measures pH, Multi-Parameter, Leak Detection, ORP, Power Usage, Temperature, Water Level
Standalone Yes
Compatibility Apex
Device Type Monitor + Control
Connectivity WiFi, App-Controlled, Ethernet, Wired
Results Display Digital
Probe Included Leak Detector, ORP, pH, Temperature, Water Level
Probe Type Dual Junction
Sensor Connection 2-Wire, BNC, Push Connect
Connection Type AquaBus, 1LINK, DC24V, 120VAC outlets, 0-10V
Power Type DC
Reviews 54
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Product Questions

Product Questions

What size LLS is included with this bundle?
Question by: Aaron Hunt on Apr 11, 2026, 8:34 PM
This comes with the 15" sensor
Answer by: Matt Lucero (BRS Staff) on Apr 13, 2026, 9:36 AM
With this system can you set up the ORP to turn off and on when it reaches the setting you want? or does it just monitor the reading?
Thanks
Question by: Bernie Morris on Dec 23, 2023, 9:00 AM
Hey there, You can program it do an action like turn an outlet off on the EB832 if that is what you are asking. If not I would suggest to give us a call or send in an email. Thanks!
Answer by: Codey on Jan 8, 2024, 1:24 PM
Do you need an Ethernet cable to use remotely? My internet modem is on the other side of the house. Any wifi capabilities?
Question by: Brian Jones on Dec 20, 2023, 12:44 PM
Hey there, yes this will work on 2.4ghz wifi bands. Thanks!
Answer by: Codey on Jan 8, 2024, 1:52 PM
Can an apex pro A3 run 3 eb8 power bars? I currently have two and am running out of spaces for my system
Question by: Riley Regennitter on Sep 28, 2023, 9:54 AM
Hey there,
Thank you for reaching out to us. Yes, they can.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Nov 15, 2023, 10:07 AM
What's needed to install a atk ?
Question by: Randy Dilbeck on Jul 23, 2023, 1:21 PM
The ATK can be stalled stand alone. Nothing else is NEEDED.
Answer by: Tyler Schafer (BRS Staff) on Jul 27, 2023, 10:43 AM
With this system am I able to add the trident at a later point?
Question by: Tyler on Jun 3, 2023, 4:13 PM
Absolutely!
Answer by: Ash (BRS Staff) on Jun 8, 2023, 7:52 AM
Can older EB4 and EB8 power bars be used with the A3 series of controllers?
Question by: b.deren on Dec 2, 2022, 2:03 PM
Thanks for the question! Yes the older EB4 and EB8s can be used with the newer Apexes currently available. Please let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Dec 15, 2022, 3:43 PM

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