Neptune Apex Probe Module 2 The Neptune Apex Probe Module 2 adds salinity or conductivity monitoring, temperature compensation, six digital inputs, and AquaBus expansion to a compatible Apex aquarium controller system. PM2 Salinity and Conductivity Expansion The PM2 is designed for aquarists who want continuous conductivity or salinity monitoring through their Apex system. Salinity stability is especially important in reef aquariums, quarantine systems, frag tanks, and automated top-off setups where evaporation, dosing errors, reservoir issues, or water-change mistakes can shift specific gravity before the problem is obvious. Neptune PM2 Features Adds conductivity and salinity monitoring to a compatible Apex system Includes an additional temperature probe port for temperature compensation Supports four conductivity measurement ranges including 0-900 uS/cm, 0-90.0 mS/cm, and 0-50 ppt Six digital inputs support compatible float switches, leak sensors, feed buttons, pressure switches, and custom switch applications Full data logging through the Apex base system Plug-and-play AquaBus module that is automatically recognized after installation Two AquaBus connectors allow flexible module placement and expansion LED status indicator provides quick module status visibility Upgradeable firmware supports long-term Apex ecosystem use Galvanic isolation helps support accurate and reliable probe readings Probe Module 2 Specifications Product type: Apex salinity and conductivity expansion module Probe input: Conductivity or salinity probe connection Temperature input: One temperature probe port Conductivity ranges: 0-900 uS/cm, 0-90.0 mS/cm, and 0-50 ppt range support Digital inputs: Six I/O switch inputs AquaBus ports: Two AquaBus connectors Compatibility: Compatible with Apex systems Included cable: 3 ft AquaBus cable Conductivity probe: Sold separately PM2 Aquarium Applications The PM2 is useful for tracking salinity trends, identifying top-off problems, monitoring mixing stations, adding an additional temperature input, or building Apex alerts around salinity drift. Because salinity readings are temperature-sensitive, the temperature input helps the Apex compensate when paired with the proper probe setup. Setup Directions Mount the PM2 in a dry, protected area and connect it to the Apex system using the included AquaBus cable. Install the conductivity probe and temperature probe according to Neptune setup guidance, then configure and calibrate the inputs in Apex Fusion. Place probes in a stable high-flow area where bubbles, microbubbles, salt creep, and electrical interference are minimized, and test all salinity alerts before relying on them. What's Included Neptune Apex Probe Module 2 3 ft AquaBus Cable
