Original Proline Promag W400 5W4C Electromagnetic Flowmeter
Versatile Standard
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
Feature | Description |
Accuracy | ±0.5% o.r. ±1 mm/s (standard); ±0.2% o.r. ±2 mm/s (Flat Spec) |
Measuring Range | 0.5 – 263 000 m³/h (2.5 gal/min to 1 665 Mgal/d) |
Mounting | 0 × DN full-bore—no straight runs needed |
Diagnostics | Heartbeat Technology, web server, data logging |
Connectivity | Analog, digital I/O, HART, PROFIBUS, EtherNet/IP, Modbus |
Protection | IP68 (Type 6P), EN ISO 12944 corrosion protection |
Certifications | Drinking water, custody transfer MI-001/OIML R49 |
