Product Overview
E+H Prosonic Flow W 400 Non-Invasive Clamp-On Ultrasonic Flow Meter
9W4BA0-AALHFNAACAABACA2+AK
The Prosonic Flow W 400 is an advanced, non-invasive clamp-on ultrasonic flow meter engineered for precise, maintenance-free measurement of both conductive and non-conductive liquids. Designed with innovative FlowDC (Flow Disturbance Compensation) technology, the W 400 maintains high-precision performance even with restricted straight inlet runs as short as 2 x DN.Flexible measurement across nominal pipe diameters from DN15 to DN4000 (1/2" to 160").
The Prosonic Flow W 400clamp-on ultrasonic flowmeter delivers safe, cost-effective, and versatile liquid flow measurement across diverse industrial applications. By measuring flow externally through transit-time ultrasonic technology, it avoids contact with aggressive or ultrapure media, completely eliminating risk of leakage, clogging, or contamination.Whether installed in water/wastewater networks, industrial utilities, or chemical processing plants, the W 400 provides long-term operational safety and zero process downtime.
Traditional ultrasonic flow meters require long straight pipe runs (10~15 x DN) to stabilize flow profiles. Featuring Endress+Hauser’s proprietary FlowDC algorithm, the W 400 compensates for upstream disturbances caused by elbows or valves, maintaining high measurement accuracy with only 2 x DN inlet run.
Equipped with specially designed solid acoustic coupling pads, the Prosonic W 400 requires no acoustic gel re-application over its entire lifecycle, dramatically reducing field maintenance costs.
Operators can easily configure, calibrate, and access device data remotely via standard web browsers—no specialized software or handheld communicators required.
Continuous self-monitoring and process transparency allow operators to detect scaling, buildup, or gas bubbles in real time without removing the sensor or interrupting process flows.
Frequently Asked Questions
Q1: What are the main benefits of using a clamp-on flow meter compared to inline meters?
A: Clamp-on flow meters like the Prosonic W 400 are installed on the outside of existing pipes. This eliminates process downtime, avoids pipe cutting/welding, prevents pressure drop, and eliminates contamination or corrosion risks associated with inline sensors.
Q2: How does FlowDC technology help in tight installation spaces?
A: FlowDC (Flow Disturbance Compensation) is an advanced algorithm that calculates and compensates for flow profile distortions caused by upstream pipe bends or valves. This allows the W 400 to maintain high accuracy with an inlet straight run of just 2 x DN, compared to the 10~15 x DN required by traditional meters.
Q3: Can the Prosonic Flow W 400 measure non-conductive liquids?
A: Yes. Unlike electromagnetic flow meters which require conductive fluids, ultrasonic transit-time meters measure liquids regardless of electrical conductivity, making it ideal for demineralized water, hydrocarbons, and solvents.
Q4: Do the coupling pads need frequent replacement or maintenance?
A: No. The W 400 utilizes permanent solid coupling pads that maintain long-term acoustic connection without drying out or degrading, requiring zero routine maintenance throughout the product’s operational lifespan.
Technical Specifications
| Sensor Characteristics | Low capital investment – cost-effectiveness increases with pipe diameter (up to DN 2000/80"). Long-term stable signal – maintenance-free permanent mounting from outside with coupling pads. Reliable measurement on various pipe materials – sensor for GRP and plastic pipes available. Mounting without process interruption. Wide nominal diameter range: DN 15 to 4000 (½ to 160"). Medium temperature up to +130 °C (+266 °F). |
|---|---|
| Transmitter Features | Safe operation – no need to open the device due to display with touch control, background lighting. Full remote access – web server. Integrated diagnostics, verification and monitoring – Heartbeat Technology. Transmitter housing made of durable polycarbonate or aluminium. Remote version for wall mounting. Integrated data logger: measured values monitoring. |
| Nominal Diameter | DN15 to 4000 (1/2 to 160") |
| Sensor materials | Clamp on system: Sensor holder 1.4301 (304), 1.4404 (316L) Sensor housing 1.4301 (304), 1.4404 (316L) Strapping bands 1.4301 (304), 1.4404 (316L) |
| Measurement Variables | Volume flow, Flow velocity, Sound velocity |
| Maximum Measurement Error | Volume flow: ±3% o.r. for DN15 ±2% o.r. for DN25 to 200 ±2% o.r. above DN200 |
| Measuring Range | 0 to 15 m/s (0 to 50 ft/s) |
| Medium Temperature Range | –40 to +130 °C (–40 to +266 °F) |
| Ambient Temperature Range | Sensor DN 15 to 65: -40 to 130°C Sensor DN 50 to 4000: -40 to 130°C |
| Transmitter housing material | Wall-mounted housing Polycarbonat; AlSi10Mg, coated |
| Protection Level | Transmitter: IP66/67, Type 4X enclosure Sensor: IP66/67, Type 4X enclosure, IP68, Type 6P enclosure (optional) |
| Display/Operation | 4‐line backlit display with touch control (operation from outside) Configuration via local display, web browser and operating tools possible |
| Ouput | 3 ouputs: 4‐20 mA/4‐20 mA HART (active) Pulse/frequency/switch output (passive) Pulse/frequency/switch output (passive) Modbus RS485 |
| Input | Status input |
| Digital Communication | HART |
| Power Supply | AC 100 to 240 V / AC/DC 24 V |
| Approvals | cCSAus |
| Product Safety | CE, C-tick marking, EAC-marking |
| Metrological Certification and Certificates | Flowmeter verification for all frequencies except 0.3 MHz, reference line size: 5 MHz DN 50, all other frequencies DN 100 Verification performed on accredited calibration facilities (acc. to ISO/IEC 17025) Heartbeat Technology complies with the requirements for measurement traceability according to ISO 9001:2015 – Section 7.1.5.2 a |
Product documents
Unlock technical documents.
Enter your work email and WhatsApp number once to access all documents for this product.