Overview

The Neptune Systems PM2 Salinity Module adds advanced conductivity and salinity monitoring to your Apex Aquarium Controller. Designed for reef aquariums, the PM2 allows for real-time tracking of salinity and temperature while also providing I/O expansion for float switches, leak detectors, and other accessories. With full Apex Fusion integration, you can log data, set alarms, and automate responses to maintain stable water chemistry.

Key Features

• Real-Time Monitoring – Provides continuous conductivity/salinity and temperature tracking.

• Multiple Ranges – Selectable measurement ranges:

  • 0–900 µS/cm

  • 0–9.0 mS/cm

  • 0–90.0 mS/cm

  • 0–50 ppt

• I/O Expansion – Includes six digital inputs for float switches, leak alarms, and pressure sensors.

• Data Logging – Full integration with Apex for monitoring, alerts, and automation.

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

• Flexible Connectivity – Equipped with two AquaBus ports for easy expansion.

• Reliable Readings – Galvanic isolation ensures accurate and stable probe data.

• Upgradeable Firmware – Keeps the module current with future Apex system updates.

• Universal Compatibility – Works with all Neptune Systems Apex Controllers.

Product Specifications

• Model: PM2 Salinity Expansion Module

• Probe Support: 1x Conductivity/Salinity probe (sold separately) + 1x Temperature probe (sold separately)

• I/O Inputs: 6 digital inputs for external switches/sensors

• Connectivity: 2x AquaBus ports

• Cable: 3 ft. AquaBus cable included

• Indicator: LED status light

• System Capacity: Supports up to 240 AquaBus modules in one Apex system

What’s Included

• (1) Neptune Systems PM2 Salinity Expansion Module

• (1) 3 ft. AquaBus Cable

Note: Salinity and temperature probes sold separately.