The Siemens SITRANS FUS380 is an inline ultrasonic flow meter for cold potable water, revenue metering and district-metering-area (DMA) applications in nominal sizes DN50 to DN1200. Using ultrasonic transit-time measurement with no moving parts, it offers high accuracy with negligible pressure loss and can run for years on battery power or from mains, making it suitable both for buried chambers and permanent installations. The companion FUE380 heat/energy variant meets EN 1434 and OIML R75 class 2 requirements.

Features & Specifications

• Ultrasonic transit-time measurement — no moving parts, negligible pressure loss and maintenance-free operation

• Nominal sizes DN50–DN1200 in PN16, PN25 and PN40; bronze or steel sensor bodies

• Typical accuracy ±0.5% for 0.5–10 m/s (FUS380); FUE380 to EN 1434 / OIML R75 class 2

• Battery operation with replaceable 3.6 V lithium (Li-SOCl₂) pack — 4.2 to 6-year change interval; or mains 87–265 V AC (50/60 Hz)

• Transmitter enclosure IP67 / NEMA 4X/6 in fibre-glass-reinforced polyamide, wall- or pipe-mountable

• Ambient range −10 °C to +55 °C (MID version); storage −40 °C to +85 °C

• 8-digit LCD with volume/flow units, status symbols and F1–F9 alarm codes; IrDA/Modbus RTU communication

• Optional passive current output module (4–20 mA) and preset pulse/alarm outputs (max ±35 V, 50 mA)

• Remote transmitter option with 5/10/20/30 m sensor cable; MID-approved (non-MID variant to +60 °C)

• EMC to EN/IEC 61326-1 (industry); vibration to IEC 68-2-6

Dimensions & Technical Data

Dimensional drawings and sensor dimensions/weights (DN50–DN1200, PN16/PN25/PN40):

Selected metric sensor dimensions (build length L / weight):

Transmitter/electronics weight approx. 1.5 kg (compact) or approx. 5 kg (remote version incl. 10 m cable set). Flange values per EN 1092-1.