Plastic Bodied Electromagnetic Flow meter

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The Plastic Bodied Electromagnetic Flow meter 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 lightweight and easy to install or remove from the pipe for inspection.

With no moving parts, the Electromagnetic Flowmeter permits unobstructed flow, minimizing flow disturbances and straight pipe requirements. The Electromagnetic Flowmeter WMP Series can be used in piping configurations where there is little space between the meter and an elbow or valve.

The Electromagnetic Flowmeter 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 the total can be displayed in a variety of units, customer-selected, and factory-set.

The Electromagnetic Flowmeter  WMP 101 is externally powered via a 5-pin connector cable (20 ft/6m)which also provides pulse output for use with a variety of Seametrics and other displays and controls for remote reading, data logging, pulse-to analog 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.

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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.


  • 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
  • Pressure: 150 psi or 10.3 bar working pressure @ 70˚ F
  • Operating Temperature Range :  Operating: 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 Range :
    • Minimum : 1”: 2.3 GPM (0.145 l/s) 2”: 6 GPM (0.38 l/s) 3”: 14 GPM (0.88 l/s)
    • Maximum :  1”: 110 GPM (6.94 l/s) 2”: 300 GPM (18.9 l/s) 3”: 670 GPM (42.3 l/s)
  • Materials :
    • Body: Glass-filled polypropylene
    • Electrodes 316 stainless steel
    • Electronics Housing Power coated diecast aluminum
    • Display Cover Polyethylene
  • Display
    • Digits: Rate 6 digits, Total: 8 digits
    • Units Rate: Gallons/Minute, Million Gallons/Day, Cubic Feet/Second, Cubic Feet/Minute, Liters/Second, Liters/Minute, Million Liters/Day, Cubic Meters/Minute, Cubic Meters/Hour
    • Units Total Acre-Feet, Acre-Inch, Gallons, Gallons x 1000,  Cubic Feet, Liters, Mega liters, Cubic Meters,
      Cubic Meters x 1000
  • Security: Cross-drilled screws and tamper-evident seal (optional)
  • Power  :
    • WMP101 : 10–30 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
    • WMP104: 6 – 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
  • Pulse Output Signal (WMP101 only) Current sinking pulse, optoisolated, 32 Vdc maximum @ 10mA maximum
  • Pulse Rate :
    • Low Frequency (-PSU) 1 unit/pulse out, the pulse width of 10 ms, depending on unit selection
      (WMP101 only)
    • High Frequency (-HF) 1” 2” 3” Pulse width 1.1 ms, min-max frequency, 3–150 Hz
      Pulse/Gal 80 30 13
      Pulse/Liter 21.14 7.93 3.44
  • Empty Pipe Detection: Hardware/software, conductivity based
  • Conductivity : >20 micro Siemens/cm
  • Environmental: NEMA 3X, IP64
  • Electrical Connection (WMP101 only) 5-pin male circular connector, mates to industry-standard cable


Dimensions are shown without the Seametrics WMP Fitting Kit


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