Hall effect flow sensor provides low cost solution for water flow measurement. Hall effect water flow sensor is mainly used for small pipe size and usually below DN30mm/DN40mm. It supports hall effect pulse output and can output pulse to PLC, oscilloscope, or other pulse counter device.


Hall effect water flow sensors include 3 main parts: flow body, hall effect and paddle wheel. There are 3 kinds of material for the flow sensors. They are stainless steel, copper and plastic plastic(e.g.POM). Stainless steel is expensive, so it is not main selling item. Thus, we will mainly introduce copper and plastic.



  • Low cost solution
  • Pulse output for flow totalizing
  • Compact size
  • Different structure/style optional
  • Convenient to install and use
  • Compliant with ROHS
  • Food grade available(Stainless steel or plastic material)

Application Lists:

  • Water Dispenser
  • Coffee Machine
  • Water Heater (Solar, Electric, Gas)
  • Steam Equipment
  • Prepaid Water Supply
  • Cooling System
  • Mechanical Equipment
  • Water Processing Equipment
  • Instrumentation
  • pharmaceutical equipment


  • Accuracy: +/-(2%-5%).Decided by body size, flow rate and spot using.
  • Pipe size: 6mm(OD),10mm(OD); ¬†1/2″,3/4″,1″,11/2″,2″
  • Power supply:5-16Vdc. 24Vdc(special order)
  • Output voltage: rated 5Vdc(<=10mA)
  • Temperature range: <=70 Deg.C. For higher temperature, require special order.
  • Pressure:<=1.6MPa
  • Storing humidity: 25%-95%RH

1.For 6mm and 10mm size, it’s POM material and connection way is plug-in.
2.Each size has its Min/Max flow rate. Flow should fall into range, otherwise the flow sensor can’t work well. For exact flow range, please feel free to contact us.
3.The water flow sensor is more suitable for small size pipe and have no requirement of high accuracy.
4.Comparing with liquid turbine flowmeter, its performance is less weaker, but price of turbine meter is higher.

Accuracy Explanation of Hall Effect Flow Sensor
As an economic solution, hall effect flow sensors are used to keep the accuracy of 5% or better. The accuracy has a close relationship with flow stability. The flow is more stable, the accuracy is better. Generally speaking, the pipe is smaller, the accuracy is higher. The accuracy of small pipe can reach to 99%.

Can Accuracy be Adjusted? How To?
Flow meter/flow sensor requires calibration to improve its accuracy. For hall effect sensor, its pulse equivalency is not fixed. That means each pulse may express different flow rate(liter). Our value is just for reference. Users can do the calibration during actual operation. While calibrate, please certain time pulse quantity and flow rate as standard data. Test for several times (3-5 times) and get the average value.

Pipe Size and Flow Rate

Hall effect flow sensor is designed for economic liquid flow measurement,so its flow rate range is not very wide and max pipe is not big. Usually, its max pipe size is below DN100mm. So when you select hall effect flow sensor, you should check whether its flow rate is suitable. If pipe size is over 100mm, it is also better to consider other type flow meters,e.g. paddle wheel, turbine, ultrasonic,magnetic,etc.