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Electromagnetic flowmeter for potable water networks and revenue metering, with accuracy up to ±0.2% and 10-year battery life
The AquaMaster4 is an electromagnetic flowmeter designed and manufactured by ABB Measurement & Analytics, the company that in 1988 developed the world's first battery-powered electromagnetic flowmeter for District Metered Areas (DMA). The instrument is purpose-built for potable water distribution networks, revenue metering, and irrigation applications, covering nominal diameters from DN40 to DN2400.
Its operating principle is based on electromagnetic induction: a magnetic field generated inside the sensor induces a voltage proportional to the velocity of the conductive fluid flowing through the pipe, allowing calculation of flow rate, flow velocity, and volume (forward, reverse, and net), with pressure available as an optional parameter via an integrated transducer.
Unlike conventional solutions, the AquaMaster4 combines flow, pressure, and data logging in a single "single-box" DMA solution, reducing investment in additional instrumentation. Its reduced-bore sensor conditions the upstream flow profile within the central measuring zone, delivering superior performance even under poor hydraulic conditions and during low night flows — key to separating leakage from authorized consumption and reducing Non-Revenue Water (NRW).
The device is backward-compatible with legacy AquaMaster sensors and integrates via Modbus RTU or the Sensus protocol into existing SCADA and telemetry systems used by water utilities, and also features a contactless NFC interface for configuration through the ABB Velox mobile app.
| Specification | Value |
|---|---|
| HARDWARE | |
| Measurement principle | Electromagnetic (Faraday's law of induction) |
| Diameter range (reduced bore) | DN40 a DN600 |
| Diameter Range (Full Virtual Bore) | DN40 a DN200 |
| Diameter Range (Full Bore) | DN250 a DN2400 |
| Probe-Type Sensor (Insertion) | 300 to 1000 mm |
| Body/Flange Material (DN40–300) | Ductile iron (SG iron) |
| Body/flange material (DN350–2400) | Carbon steel |
| Coating | Two-component epoxy, light gray (RAL 9002), corrosion resistance comparable to EN ISO 12944 Grade C4 |
| Transmitter mounting | Integrated or remote (cable up to 150 m) |
| Ambient temperature | -20 to 60/70 °C, depending on component |
| Transmitter vibration | IEC 60068-2-6 (2007), 2g level |
| MEASUREMENT | |
| Accuracy (Class 1) | ±0.2% of reading |
| Accuracy (Class 2) | ±0.5% or ±0.4% of reading |
| Accuracy at low flow rates | ±0.5 to ±2 mm/s (depending on sensor and class), whichever is greater |
| Turndown ratio (R) | Up to R1000 |
| Measured parameters | Flow rate, flow velocity, volume (direct, reverse, net), pressure (optional) |
| Minimum fluid conductivity | >20 µS/cm (flanged sensor) / >50 µS/cm (probe) |
| Process pressure (optional transducer) | 20 or 40 bar absolute |
| COMMUNICATION AND STORAGE | |
| Outputs | Pulse/alarm, Modbus RTU (RS-485), Sensus protocol (3-wire) |
| Modbus | 9,600/19,200 baud, up to 32 devices per segment |
| Configuration interface | NFC + ABB Velox app (Android/Windows) |
| Internal logger | Up to 45,871 flow/pressure records; up to 8 years of 24-hour totals |
| Logging Interval | 15 s, 30 s, 1, 5, 15 min, or 24 h (configurable) |
| Export Format | CSV, with timestamp |
| MAINTENANCE | |
| Battery power | 2 D-cell lithium batteries, up to 10 years (depending on size and configuration) |
| Renewable power | Solar/wind, 6 to 32 V DC @ 5 W |
| AC Power (remote option) | 95 to 240 V AC, 50/60 Hz |
| On-site Verification | Self-diagnostics and verification compatible with the ABB SRV500 tool, in accordance with OIML R49 Type P |
| Protection Rating | IP68 (NEMA 6P), submersible up to 10 m, buryable up to 5 m |
| CERTIFICATIONS | |
| Contact with drinking water | WRAS, NSF-61, ACS, AS/NZS 4020, DVGW W270 |
| Metrology | MID MI-001, OIML R49 (classes 1 and 2), NMI R49/NMI 10 (Australia) |
| Factory Calibration | ISO 17025, UKAS, NATA, SIMT certified laboratories, traceable to NIST |
| MANUFACTURER AND WARRANTY | |
| Country of manufacture | ABB Measurement & Analytics |
| País de fabricación | United Kingdom (ABB Limited plant, Stonehouse, Gloucestershire) |
| Warranty | Please consult the current terms and conditions with Marfel or an authorized ABB distributor |