Starting at $4,647.24



  • Measures volume flow, conductivity and mass flow
  • ACS, KTW/W270, NSF 61, WRAS BS 6920 drinking water approval
  • DN 25 to 2000 (1 to 78 in.) nominal diameter range
  • Media Temperature Ranges:
    • Hard Rubber Liner: 32 to 176°F (0 to 80°C)
    • Polyurethane Liner: –4 to 122°F (–20 to 50°C)
  • 2.5 gal/min to 700 Mgal/d measuring range
  • Up to 3 Outputs:
    • 0‐20 mA/4‐20 mA HART (active)
    • Pulse/frequency/switch output (passive)
    • Pulse/frequency output (passive)
    • Switch output (passive)
  • Maximum Measured Error:
    • Volume flow (standard): ±0.5 % o.r. ± 1 mm/s (0.04 in/s)
    • Volume flow (optional): ±0.2 % o.r. ± 2 mm/s (0.08 in/s)
  • PN 40, Class 300, 20K maximum process pressure
  • No pressure loss due to cross-section constriction
  • 4-line backlit display with touch control & WLAN access
  • HART, PROFIBUS DP, EtherNet/IP, Modbus RS485 digital communications
  • IP66/67, Type 4X standard enclosure
    • IP68, Type 6P (optional for remote sensor)
    • IP68, Type 6P includes protective varnish according to EN ISO 12944 C5‐M/Im1/Im2/Im3
  • Heartbeat Technology (optional)
Predecessor: Promag 50W, Promag 53W, Promag 51W, and Proline Promag L 400 / 5L4C


The E+H Proline Promag W 400 electromagnetic flow meter measures volume flow, conductivity and mass flow. It features certified corrosion protection (EN ISO 12944) for underground or permanent underwater installation making it an ideal fit in water, wastewater and custody transfer industries. The bidirectional measuring principle is not dependent on pressure, density, temperature and viscosity. Because it has no moving parts, the Promag W 400 is maintenance-free and applications suffer no pressure loss due to cross-section constriction.

E+H transmitters do not require proprietary communication system, rather they offer full access to process and diagnostic information via numerous, freely combinable I/Os and fieldbuses. The W 400 allows for up to three analog or digital outputs. Digital communication options include HART, PROFIBUS DP, EtherNet/IP and Modbus RS485. This E+H flow meter is housed in an IP66/67, Type 4X enclosure standard, while IP68, Type 6P protection is also available as an option for the remote sensor. The IP68, Type 6P protection also includes a protective varnish according to EN ISO 12944 C5‐M/Im1/Im2/Im3.

The E+H Proline Promag W 400 electromagnetic flow meter can measure flow from 2.5 gal/min up to 700 Mgal/d and can handle a variety of media temperatures, depending on liner material. Two liner materials are available including hard rubber (32 to 176°F) and polyurethane (-4 to 122°F). The standard maximum measured error is ±0.5 % of reading ± 1 mm/s and the Proline Promag W 400 offers an improved accuracy of ±0.2 % of reading ± 2 mm/s. Optional Heartbeat Technology ensures compliance and process safety at all times.


This product can be used in the following applications:

In Stock

Part Number Price Available
$4,923.63 5 in stock
$7,495.89 1 in stock
$4,923.63 1 in stock

Manufacturer Stock

This stock is typically available to ship in 1 - 3 working days

Part Number Price Available
$6,789.59 9 in stock
$7,021.42 2 in stock
$7,021.42 2 in stock
$18,951.91 2 in stock
$6,772.46 1 in stock
$7,107.25 1 in stock
$5,920.54 1 in stock
$9,740.13 1 in stock
$9,262.62 1 in stock
$8,388.87 1 in stock
$12,313.31 1 in stock
$6,164.79 1 in stock

Additional Part Numbers

These part numbers are available as old stock, but we have limited information about the configuration. Please call for more information.

Part Number Price Available
5W4C50-AAELNP2DUA1KGACQ Call for information 1 Call to order
5W4C2H-C6ELHA0DUA1KGAAAJAJB Call for information 2 Call to order
5W4C2F-AAELNP2DUA1KGAAACQPAPB Call for information 1 Call to order
5W4C2H-AAELNP2DUA1KGBAACQPAPB Call for information 2 Call to order

Interested in Other Part Numbers?

Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 3-5 weeks". Click here to select options