Endress+Hauser Promag W 400 Electromagnetic Water Flowmeter

Overview

The Endress+Hauser Promag W 400 is an electromagnetic flowmeter purpose-built for water and wastewater applications, delivering accurate, reliable volumetric flow measurement across an exceptionally wide nominal size range of DN25 to DN3000 (1 to 120 inches). Distinct from Endress+Hauser’s hygienic Promag H series used in food, beverage, and pharmaceutical duty, the Promag W 400 is optimized specifically for raw and potable water transmission, water treatment, irrigation, and utility metering, with international drinking water approvals and construction options suited to buried and immersed installations.

As a regional supplier for Endress+Hauser, Seven Star LLC supplies the Promag W 400 electromagnetic flowmeter to water utilities, municipalities, and industrial water treatment operators across Oman, Muscat, and the wider GCC, with manufacturer documentation and application sizing support.

Measurement Principle

The Promag W 400 measures flow using Faraday’s law of electromagnetic induction: a magnetic field is generated across the pipe cross-section, and as conductive liquid flows through this field, it induces a voltage proportional to the average flow velocity. A pair of measuring electrodes in contact with the fluid picks up this induced voltage, and the transmitter converts the signal into a highly accurate volumetric flow reading with no moving parts in the flow path.

Because there are no obstructions, impellers, or moving parts inside the measuring tube, the Promag W 400 produces zero pressure loss across the meter, requires minimal straight inlet/outlet piping compared with mechanical flow technologies, and avoids the wear, fouling, and maintenance burden associated with moving-part meters on continuously flowing water lines. Endress+Hauser’s Heartbeat Technology adds continuous self-verification and build-up detection, giving operators diagnostic confidence in the measurement without removing the meter from service.

Engineering Design of the Endress+Hauser Promag W 400

The Promag W 400 sensor is offered with liner materials selected for water duty – hard rubber (0 to +80°C), polyurethane (-20 to +50°C), or PTFE (-20 to +90°C) – paired with electrode materials including 1.4435 (316L) stainless steel, Alloy C22, or tantalum for demanding water chemistries, and process connections rated up to PN40, Class 300, or 20K depending on flange standard. The remote or integrally mounted transmitter houses an integrated web server and data logger, and offers HART, PROFIBUS DP, EtherNet/IP, and Modbus RS485 communication options for direct integration with a plant SCADA or a utility’s telemetry system.

The transmitter/converter housing carries an IP68 (Type 6P) protection rating, allowing the Promag W 400 to be installed in submerged pits, buried vaults, and outdoor metering chambers typical of municipal water networks across Oman, while the sensor’s flanged or lap-joint process connections accommodate the large-diameter transmission mains common in bulk water supply and desalination distribution schemes.

Key Features

The Endress+Hauser Promag W 400 combines a wide size range with water-specific materials and international approvals for confident deployment across municipal and industrial water networks. Key features include:

• Nominal size range of DN25 to DN3000 (1 to 120 inches), covering everything from small service connections to bulk transmission mains.
• Standard accuracy of ±0.5% o.r. and an optional Flat Spec accuracy of ±0.2% o.r. for custody-grade applications.
• International drinking water approvals for potable water supply and treatment applications.
• Zero pressure loss and no moving parts, eliminating a major source of maintenance on water transmission lines.
• IP68 (Type 6P) enclosure rated for buried, submerged, and outdoor pit installations.
• Heartbeat Technology for continuous diagnostics, build-up detection, and in-situ verification.
• Integrated web server and data logger for local commissioning and trend review without extra software.
• HART, PROFIBUS DP, EtherNet/IP, and Modbus RS485 communication for SCADA and telemetry integration.

Industrial Applications

The Endress+Hauser Promag W 400 is specified throughout Oman’s water utility and municipal infrastructure, including potable water treatment plant intake and distribution metering, bulk transmission main flow measurement, irrigation and agricultural water supply schemes, and RO desalination plant feed and product water metering across the Sohar and Salalah economic zones. Its wide size range and buried-installation IP68 rating also make it the standard choice for large-diameter municipal mains where a mechanical meter would be impractical to install or maintain.

As the trusted supplier for Endress+Hauser, Seven Star LLC supplies the Promag W 400 to water utilities, EPC contractors, and industrial water treatment operators across Oman and the GCC, supplying genuine flowmeters sized and configured correctly for the pipe diameter, liner material, and communication protocol each project requires.

Technical Specifications

The table below summarizes the principal Endress+Hauser Promag W 400 specifications for this electromagnetic flowmeter, useful when sizing a Promag W 400 for a given pipe diameter.

Request a Quote for Endress+Hauser Promag W 400

Seven Star LLC invites water utility engineers, EPC contractors, and industrial water treatment operators across Oman and the GCC to submit a formal RFQ for the Endress+Hauser Promag W 400 electromagnetic flowmeter. We supply on request with lead time confirmed at quotation, can supply the full manufacturer technical datasheet on request, and our instrumentation division is available to help select the correct size, liner, and communication protocol for your water network. In Oman and the GCC, Seven Star LLC provides manufacturer documentation and local technical support for every Promag W 400 supplied.

Browse the full Endress+Hauser (E & H) range or see more Flowmeters products supplied by Seven Star LLC in Oman and the GCC.