ABB AquaMaster 3 Battery Operated Electromagnetic Flow Transmitter (FET221-5MXX-SP01)

The **FET221-5MXX-SP01** is a high-precision, DSP-driven electromagnetic flow transmitter from ABB's AquaMaster 3 series, engineered to process microvolt signals from inline sensors based on Faraday’s Law. Operating on an ultra-low-power architecture ($<1\text{ W}$) compatible with battery, mains, or solar inputs, it features a high turndown ratio for precise bi-directional flow measurement down to $<0.1\text{ m/s}$. Housed in a fully submersible **IP68 (NEMA 6P)** polycarbonate enclosure, the unit integrates multi-channel data logging for flow, totalization, and pressure, while providing NAMUR NE107 compliant diagnostics for real-time monitoring of coil impedance, empty-pipe states, and sensor health.