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
Starting At $317.60
Stock Check Availability  

The WS 131 features a simple design consisting of a PVC housing and an electronic sensor module that easily attache 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 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
Questions & Answers
No Questions
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Part #
Eno Scientific WS 131 Flow Meter
WS 131 flow meter
Your Price $317.60
Check Availability  
Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 1" housing
Check Availability  
Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 1.5" housing
Check Availability  
Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 2" housing
Check Availability  
Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 3" housing
Check Availability  
Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 4" housing
Check Availability  
Eno Scientific WS 131 Flow Meter with Housing
WS 131 flow meter with 6" housing
Check Availability  
  Accessories 0 Item Selected
Notice: At least 1 product is not available to purchase online
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

Going, Going, Gone: Endangered Species Recovery and Conservation

Across the planet, biodiversity and natural habitats are declining dramatically. Countless species of flora and fauna around the world are being listed as either threatened, endangered, or extinct. According to a 2019 UN Study , around one million species are already at risk of extinction. Unless action is taken to reduce the causes of biodiversity loss, many of these species could disappear within the next few decades. Invasive species, habitat destruction, pollution, and other environmental stressors are all major causes of biodiversity decline. While high biodiversity is synonymous with places like the Amazon Rainforest and the Great Barrier Reef, it can also be found locally.

Read More

CastAway Doubts about Conductivity, Depth and Temperature Monitoring

The Sontek CastAway-CTD is a castable device that measures conductivity, temperature and depth. The instrument has been used in the field for over a decade by oceanographers, limnologists, divers, fishers and educators. There have been few changes since the first iteration in 2010, showing that the instrument is durable and accurate without requiring new models.   The CastAway is the first conductivity, temperature and depth (CTD) instrument of its kind. While other CTDs are large and cumbersome to deploy, with cages and isolated sensors, the CastAway is a small, lightweight and easy-to-use instrument. Typical CTDs utilize pumps to ensure water flows over the sensors during deployment.

Read More

Dimethyl Sulfide: A Key to Marine Sulfur Biogeochemistry

Christopher Spiese is assistant dean at the Getty College of Arts & Sciences, acting director of the school of social sciences and human interaction, and associate professor of chemistry at Ohio Northern University. He is also a marine sulfur enthusiast. Marine sulfur biogeochemistry, which involves the cycling of sulfur through aquatic biological and geological systems, is essential for the functioning of marine life. However, the exact chemistry involved is not entirely known, piquing the interest of researchers like Spiese. “I went into marine sulfur biogeochemistry during my graduate work. I completed a doctoral environmental chemistry program at SUNY College of Environmental Science and Forestry (SUNY-ESF) under David Kieber.

Read More