Eno Scientific WS 131 Flow Meter

The Eno Scientific WS 131 Flow Meter is designed to measure water flow for monitoring well drawdown and usage.


  • Flow meter housings are available in 5 sizes
  • Data can be displayed and logged by the Well Sounder 2010 PRO
  • Includes the total flow, flow rate and recovery rate functions
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The Eno Scientific WS 131 features a simple design consisting of a PVC housing and an electronic sensor module that easily attaches to the housing using a hand-tightened ring nut. Once the sensor is installed, it transmits electrical pulses that are generated as water moves past the paddle wheel. The amount of water volume that passes through the pipe can be interpreted by an Eno Scientific water level meter like the Well Sounder 2010 Pro. During inactivity, the sensor can be removed and replaced with an inexpensive plug with the same kind of hand-tightened ring nut concept.

Flow meter housings are available in various sizes. The 1", 1.5" and 2" housings are in-line tees made with Type 1 PVC with sockets for schedule 40 PVC pipes, and compatible with common PVC piping and adhesives. The 3" and 4" housings are saddle tees made of Type 1 PVC which clamps onto schedule 40 PCV pipes. The paddle wheel is made of a tough polyethylene material and is the only object subject to wear in the entire system. In the case of highly abrasive water flow, the paddle wheel may experience wear with time but is easily replaced without tools.

The electronic flow sensor operates off a 5-24 VDC power supply and provides an output voltage on the signal line, which switches between Vin and ground as the paddle wheel turns. Data collection is configurable by either plugging a ready-to-plug cable into the Well Sounder 2010 Pro, or with three-wire leads for connection to other data logging devices. An accessory splitter is necessary for the Well Sounder to monitor and log data from both the flow meter and the probe.

  • Materials
  • Housings: Type 1 PVC
  • Paddle Wheel: HDPE
  • O-Ring: Buna N
  • Axle: Tungsten Carbide
  • Plumbing & Physical
  • Pipe Size: Schedule 40 PVC
  • Test Pressure: 240 psi
  • Temperature: 32 – 140° F (0 – 60° C)
  • Dimensions
  • 1" Housing: 5.75 x 4.5 x 2.4″
  • 1.5" Housing: 6.25 x 5.25 x 2.4″
  • 2" Housing: 7.11 x 5.75 x 3″
  • 3" Housing: 5.0 x 5.5 x 6.5″
  • 4" Housing: 5.0 x 6.5 x 7.5″
  • Clearance for Sensor Removal: 3.5”
  • Electrical
  • Power: 5 – 24V at 500 uA max
  • Output Signal: Pull-to-ground (+V – 0V)
  • Pulse Width: ~5mS
  • Frequency: 0.3 – 200 Hz
  • (1) Flow meter
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Eno Scientific WS 131 Flow Meter
WS 131 flow meter
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WS 131 flow meter with 1" housing
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WS 131 flow meter with 1.5" housing
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Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 2" housing
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Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 3" housing
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Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 4" housing
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Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 6" housing
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