Endress + Hauser Proline Promag W 400 Electromagnetic Flowmeter

Overview: Proline Promag W 400

The Proline Promag W 400 from Endress+Hauser is a high-performance electromagnetic flowmeter tailored for the water and wastewater industries. It features:

• High accuracy: Standard version offers ±0.5% of reading (o.r.) ± 1 mm/s; optional Flat Spec feature improves precision to ±0.2% o.r. ± 2 mm/s
• Wide measuring range: From 0.5 m³/h up to 263 000 m³/h (about 2.5 gal/min to 1 665 Mgal/d)
• Multiple liner options for handling different temperatures and fluids:
• Hard rubber: 0 °C to +80 °C
• Polyurethane: −20 °C to +50 °C
• PTFE: −20 °C to +90 °C
• Robust construction: Process pressure rated to PN 40/Class 300/20K; electrodes are made of high-grade materials like 316L, Alloy C22, and tantalum

Key Advantages

1. Unrestricted Mounting — 0 x DN Full-Bore Design

The Promag W line is the first electromagnetic flowmeter globally that requires no straight inlet or outlet runs (0 × DN) and is full-bore—eliminating measuring tube restrictions and avoiding pressure loss This makes it perfect for tight layouts or installation immediately downstream of bends, T-connections, or turbulence-inducing elements, while still delivering ±0.5% accuracy

2. Advanced Signal Processing

Its innovative measurement approach uses multiple electrodes to capture a high density of flow data, paired with refined signal analysis—ensuring reliability even amid swirl or complex flow profiles

3. Seamless System Integration & Smart Diagnostics

• Available in compact (Proline 300/400) or remote transmitter (400/500) versions with up to four I/Os
• Features Heartbeat Technology, enabling built-in verification and diagnostic functions without interrupting operation
• Built-in web server, WLAN access, and integrated data logger make configuration and monitoring straightforward, without extra tools
• Connectivity includes HART, PROFIBUS DP, EtherNet/IP, Modbus RS-485, plus analog, pulse, and switch outputs

4. Durable & Compliant

• Rated to IP68 (Type 6P) for sensor protection—suitable even for submersion or burial
• Supports custody transfer per MI-001/OIML R49 and comes with international drinking water certifications (ACS, KTW/W270, NSF 61, WRAS)
• Corrosion-resistant and designed for reliable long-term use (EN ISO 12944)

Applications

The Proline Promag W 400 is ideal for:

• Drinking water, utility water, and municipal/industrial wastewater measurement
• Space-constrained environments, where traditional straight-pipe requirements aren't feasible
• Custody transfer situations, ensuring high accuracy and regulatory compliance
• Harsh or submerged installations, thanks to its rugged IP68-rated design and protective coating

User Insights & Practical Tips

A user on Reddit highlighted a useful installation note regarding flange gaskets:

For hard rubber lining, additional seals are always required; polyurethane lining generally does not need them

Another user mentioned challenges with Modbus register mapping:

The Modbus mapping can be confusing—they struggled to find stable unit registers or velocity outputs and had scan configuration issues

Summary Table