HYDROS Control X4 Aquarium Controller

Aquarium Controller with pH/ORP Probe Ports and Sensor Monitoring

The HYDROS Control X4 handles the essential functions of running a healthy tank without requiring extra expensive modules to get started. With additional accessories sold separately, it can monitor temperature, pH, ORP, and water level, and control pumps, timers, and sensors. It works well in saltwater tanks, freshwater tanks, and ponds, and it can run on its own or link into a larger HYDROS setup as your system grows.

Setup is quick, which makes the Control X4 approachable for beginners while still offering the depth advanced hobbyists want, including two digitally isolated pH/ORP probe ports and a 0-10V port for connecting variable-speed pumps or legacy automation gear. All HYDROS products are engineered, assembled, and supported in the USA.

Key Features:

• Two digitally isolated pH/ORP probe ports for accurate, interference-free readings
• Four sense ports supporting temperature, optical and capacitive level sensors, and leak detectors
• Two drive ports delivering up to 1A each for ATO pumps, fans, and solenoids
• 0-10V input and output port for variable-speed pumps and third-party automation
• Two Command Bus ports for wired links to other HYDROS controllers
• Dual-core 32-bit processor for fast, on-device control decisions
• IP65-rated, splash-proof, dust-proof housing with aircraft-style connectors

Ideal For:

• Hobbyists who want dual pH/ORP monitoring without buying a larger all-in-one controller
• Reef keepers integrating variable-speed pumps or legacy gear through a 0-10V connection
• Anyone building a modular HYDROS system and adding sensors and probes over time

Pro Tips:

• Mount the Control X4 vertically before powering it on. Like other HYDROS controllers, it's designed to hang on a wall or side panel for reliable long-term operation.
• Use the second pH/ORP port for a redundant or ORP reading. Running two probes at once lets you cross-check pH accuracy or track ORP alongside pH without a second controller.
• Remember this is controller only. Probes, sensors, and dosing accessories are sold separately, so plan your accessory list before setup day.