Tunze Osmolator 3 ATO

Tunze Osmolator 3 (ATO 3154) is a high‑precision, dual‑sensor automatic top‑off system built for both freshwater and saltwater aquariums. It’s designed to maintain a stable water level with redundant safety features, a high‑performance dosing pump, and plug‑and‑play reliability. Below is a structured, shop‑ready overview grounded directly in Tunze’s published specifications. ⭐ Core Identity A straightforward, safe, and highly accurate ATO using: Primary optical sensor (0.5 mm accuracy) Independent thermal safety sensor for overflow protection Turbelle High Jet 5030 pump with dry‑run and blockage protection Magnet + tube holders for flexible mounting This combination makes the Osmolator 3 one of the most reliable ATO systems available for reef aquariums. 🔍 Key Features Optical water‑level sensor Detects level changes with 0.5 mm precision, resistant to bubbles, deposits, and scratches. Thermal safety sensor Stops the pump if overfilling is detected, providing 100% overflow protection. High Jet 5030 dosing pump Max head height: 6.2 m (20.34 ft) Quiet 3‑phase sine‑wave motor Integrated dry‑run & blockage protection Plug & Play No software setup; parameters are factory‑optimized from years of field experience. Premium cabling & hose High‑abrasion, seawater‑resistant cable German‑made PU hose, hydrolysis‑resistant, flexible, kink‑resistant Mounting compatibility Sensor holds on glass up to 15 mm (0.59") Tube holder fits up to 22 mm (0.87") Medical‑grade 12V power supply Built to SELV safety standards. 5‑year warranty Tunze’s long‑term support and “built for the long haul” manufacturing. ⚙️ How It Works Optical sensor monitors water level with sub‑millimeter precision. When the level drops, the High Jet 5030 pump activates. Thermal sensor provides redundant protection—if water rises too high, the pump shuts off. A 10‑minute safety timer limits water addition in case of tubing damage (per manual). 📦 Included Components Optical sensor Thermal safety sensor Turbelle High Jet 5030 pump Magnet holder Tube holder PU hose 12V DC power supply Push‑in hose connector (¼" BSP → 6 mm) 🧪 Best Use Cases Reef tanks needing high‑accuracy salinity stability Systems where overflow protection is critical Sumps with variable turbulence (optical sensor resists bubbles) Cabinet‑mounted filtration or rim‑mounted setups