Control X3-S (Controller Only) - Hydros

Take Full Control of Your Aquarium with the HYDROS Control X3-S

The HYDROS Control X3-S brings unparalleled automation and monitoring to your aquarium—now with the added ability to monitor salinity levels. In addition to all the powerful features of the original Control X3, the X3-S includes a dedicated Salinity Probe Port for real-time conductivity tracking, making it a top-tier choice for reef aquarists who demand precision.

It connects to two sensor devices, including temperature sensors, water level sensors, and leak detectors, and features both a Probe Port for pH or ORP monitoring and a Salinity Probe Port for accurate conductivity measurement. The Control X3-S can send real-time alerts and notifications while managing essential equipment such as lights, pumps, and feeders through optional HYDROS Smart Plugs or WiFi Power Strips (sold separately).

Whether you’re running a saltwater aquarium, freshwater tank, or pond, the Control X3-S functions as a standalone controller or seamlessly integrates with other HYDROS devices for a customized, expandable system. Built on the HYDROS Safety Net, it ensures reliability and resilience with an IP65 rating to withstand harsh aquatic conditions.

Proudly designed, assembled, and supported in the USA.

Seamless Expansion Without Extra Modules

Every HYDROS device operates independently, featuring its own CPU and scheduling capabilities—eliminating the risk of a single point of failure. Easily expand your system by connecting multiple HYDROS devices, creating a fully automated aquarium ecosystem tailored to your setup.

Built for Marine Environments – IP65 Rated

Designed to endure splashing water, dust, and corrosive salt spray, HYDROS devices are built like industrial controllers. Featuring aircraft-style connectors and a rugged enclosure, the Control X3-S delivers long-term reliability in demanding conditions.

Smart Features & Remote Access

With HYDROS, control your aquarium from anywhere in the world via the HYDROS cloud-based app or manage it locally over WiFi. The Control X3-S is equipped with:

• Dual-core 32-bit processor for lightning-fast control decisions
• Internal health monitoring to track voltage, current, CPU status, and internal temperature
• HYDROS Command Bus connectivity for seamless communication and power transfer

Advanced Sensor, Probe & Salinity Integration

2 – Sense Ports
HYDROS introduces a versatile Sense Port system, allowing you to monitor multiple parameters with a single connection.

Compatible sensors include:

• Temperature probes
• Optical & capacitive liquid level sensors
• Rope & point leak detectors
• Flow rate sensors
• Magnetic & push-button switches

1 – Probe Port
A standout feature of the Control X3-S, this port supports pH and ORP probes with cutting-edge digital galvanic isolation—ensuring accurate readings by preventing electrical interference from other equipment like pumps and motors.

1 – Salinity Probe Port
Exclusive to the X3-S, this dedicated port supports a salinity/conductivity probe, allowing for constant monitoring of salt levels—essential for stable reef tank performance.

2 – Command Bus Ports
The HYDROS Command Bus provides both power and communication between HYDROS devices, creating the ultimate failsafe system for your aquarium.

Experience the Future of Aquarium Automation with HYDROS

Reliable, expandable, and built to thrive in aquatic environments, the HYDROS Control X3-S is the ultimate tool for effortless aquarium management—now with integrated salinity monitoring.