Neptune Systems PM1 Module

The PM1 module adds pH or ORP (redox) monitoring — plus a temperature sensor port and six digital I/O inputs — to your aquarium controller system. Whether you use a pH or ORP probe, the module gives you real-time water chemistry data, logs it automatically, and lets the controller trigger outputs based on those readings (e.g. CO₂ solenoid for a calcium reactor, ozone generator, or alarms). The six extra I/O inputs make the module flexible: you can connect float switches, leak-detection sensors, sump sensors or other triggers for automated responses. It integrates seamlessly via AquaBus and is compatible with all systems in the same controller ecosystem.