Seametrics WMP Series Plastic Electromagnetic Flow Meter

The WMP-Series is a full-bore, plastic-bodied electromagnetic flow meter designed for flow and usage monitoring applications in 1, 2 and 3 inch pipe.


The WMP-Series is a full-bore, plastic-bodied electromagnetic flow meter designed for flow and usage monitoring applications in 1, 2 and 3 inch pipe. The polypropylene flow tube offers corrosion resistance to a wide range of chemicals and fertilizers. It is light weight and easy to install or remove from the pipe for inspection. With no moving parts, the magmeter permits unobstructed flow, minimizing flow disturbances and straight pipe requirements.

The WMP Series can be used in piping configurations where there is little space between the meter and an elbow or valve. The WMP-Series is resistant to wear from sand and debris found in ground or surface water. Since there are no bearings or propeller to wear out, maintenance and repair costs are kept to a minimum and it tolerates high flows without damage. A hinged polyethylene cover is included that protects from dust and UV rays, while permitting easy access to the flow rate and total display. The electronics housing can be fitted with cross-drilled screws and seal wire for tamper-evidence. Flow rate and total can be displayed in a variety of units, customer-selected and factory-set.

The WMP101 is externally powered via a 5-pin connector cable (20ft/6m) which also provides pulse output for use with a variety of Seametrics and other displays and controls for remote reading, data logging, pulse-toanalog conversion, and telemetry applications. The WMP104 is a battery-operated unit for use when pulse output is not required. The standard batteries are user replaceable with an approximate 1 year life depending on usage. An extended battery life option offers an estimated 2-4 year life depending on usage. In the event of DC power loss, or when changing batteries, the WMP will retain internal settings and flow total.




Seametrics, a member of the TASI Flow Group, is a designer and manufacturer of a variety of flow metering and submersible sensor products. Since 1990, we have provided innovative solutions to users in irrigation, fracking, water & wastewater, environmental, and processing applications. Our products have a reputation for durability and accuracy at a competitive price and are sold through our network of domestic and international distributors.

Located just south of Seattle, our Kent, WA factory is home to both our engineering and production groups. We employ just-in-time manufacturing methods and have a high commitment to continuous improvement as demonstrated by our ISO 9001 quality management system. Our focus on innovation, product value and customer accessibility has resulted in over two decades of continuous growth. Seametrics is dedicated to helping conserve the world’s most valuable resource by providing our customers with precision flow meter and environmental sensor products.


  • No moving parts
  • Minimal straight pipe required
  • Battery powered
  • Built-in rate & total indicator
  • Corrosion resistant
  • Pulse output (WMP101 only)


  • Industrial wastewater discharge
  • Grey water
  • Well monitoring
  • Irrigation
  • Mining


Pipe Size 1, 2, or 3 inch full port
Fittings 1 inch NPTF, 2 or 3 inch flange clamps with 2 or 3 inch NPTF fitting kit
Pressure150 psi or 10.3 bar working pressure @ 70˚ F
 Operating Temperature RangeOperating: 10˚ to 130˚ F (-12˚ to 54˚ C), Non-operating: -40˚ to 176˚ F (-40˚ to 80˚ C)
 Accuracy±1% of reading (between 10% and 100% of maximum flow)
±3% of reading (between cutoff and 10% of maximum flow)
Flow RangeMinimum1”: 2.3 gpm (0.145 l/s)2”: 6 gpm (0.38 l/s)3”: 14 gpm (0.88 l/s)
Maximum1”: 110 gpm (6.94 l/s)2”: 300 gpm (18.9 l/s)3”: 670 gpm (42.3 l/s)
MaterialsBodyGlass-filled polypropylene
Electrodes316 stainless steel
Electronics HousingPower coated diecast aluminum
Display CoverPolyethylene
UnitsGallons/Minute, Million Gallons/Day, Cubic Feet/Second, Cubic Feet/Minute, Liters/Second, Liters/Minute, Million Liters/Day, Cubic Meters/Minute, Cubic Meters/HourAcre-Feet, Acre-Inch, Gallons, Gallons x 1000, Cubic Feet, Liters, Megaliters, Cubic Meters, Cubic Meters x 1000
Security Cross-drilled screws and tamper-evident seal (optional)
PowerWMP10110–30 Vdc @ 60 mA maximum (15 mA average) Note: Using an unregulated power supply >18 Vdc may damage the meter due to AC line input voltage fluctuation.
WMP1046 – AA 1.5V lithium cells, replaceable. Estimated life is 1 year depending on usage (standard) 2 – C 3.6V lithium batteries, replaceable. Estimated life is 2–4 years depending on usage (extended battery life opt)
Pulse Output Signal (WMP101 only)Current sinking pulse, opto-isolated, 32 Vdc maximum @ 10mA maximum
Pulse Rate
(WMP101 only)
 Low Frequency (-PxU)1 unit/pulse out, pulse width of 10 ms, depending on unit selection
 High Frequency (-HF)
Pulse width 1.1 ms, min–max frequency, 3–150 Hz
1” 2”3”
Pulse/Liter 21.147.933.44
Empty Pipe DetectionHardware/software, conductivity based
Conductivity>20 microSiemens/cm
EnvironmentalNEMA 3X, IP64
 Electrical Connection (WMP101 only) 5-pin male circular connector, mates to industry standard cable

Additional Information

Quick Start Guide: Seametrics WMP QuickStart Guide

Datasheet: Seametrics WMP Datasheet

Manual Instruction: Seametrics WMP Instruction Manual

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