Brass Copper YF-B1 Water Flow Sensor 1.75Mpa G1/2 Pulse Hall Flow Meter Switch 1-25L/Min

• This sensor sits in line with your water line and contains a pinwheel sensor to measure how much liquid has moved through it. There's an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.
  
  
• The sensor comes with three wires: red (5-15VDC power), black (ground) and yellow (Hall effect pulse output). By counting the pulses from the output of the sensor, you can easily calculate water flow. Note this isn't a precision sensor, and the pulse rate does vary a bit depending on the flow rate, fluid pressure and sensor orientation. It will need careful calibration if better than 10% precision is required. However, its great for basic measurement tasks!
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  We have as example Arduino sketch that can be used to quickly test the sensor, it will calculate the approximate flow of water in liters/hour.
  
  
• The pulse signal is a simple square wave so its quite easy to log and convert into liters per minute using the following formula.
  
  
• Pulse frequency (Hz) / 11 = flow rate in L/min.
  
  Specification
  
     
• Mini. Wokring Voltage: DC 4.5V  
• Max. Working Current: 15mA (DC 5V)
• Working Voltage: 5V～24V
• Flow Rate Range: 1～25L/min
• Load Capacity: ≤10mA(DC 5V)
• Operating Temperature: ≤80℃
• Liquid Temperature: ≤120℃
• Operating Humidity: 35%～90%RH
• Water Pressure: ≤1.75MPa
• Storage Temperature: -25℃～+80℃ 
•  Storage Humidity: 25%～95%RH
  
  Materials
  
   
•    Body: copper brass
•     Stainless steel bead: Stainless steel SUS304  
•     Axis: Stainless steel SUS304  
•     Impeller: POM  
•     Magnet: Ferrite  
•     Cover: PA66
•     Screw: 4 Stainless steel SUS304 3.0*11
•     Cable: 1007 24AWG  
  
  Reading Water Flow rate with Water Flow Sensor
  
  This is part of a project I have been working on and I thought I would share it here since there have been a few threads on how to read water flow rate in liters per hour using the Water Flow Sensor found in the Seeed Studio Depo. It uses a simple rotating wheel that pulses a hall effect sensor. By reading these pulses and implementing a little math, we can read the liquids flow rate accurate to within 3%.
  
  Wiring Diagram
  
  The external diameter of thread the connections use is 1.4mm.

Output Table:

•     Pulse frequency (Hz) in Horizontal Test: = 11Q, Q is flow rate in L/min. (Results in +/- 3% range)
•     Output pulse high level Signal voltage: >4.5 V (input DC 5 V)
•     Output pulse low level Signal voltage: <0.5V (input DC 5V)
•     Output signal duty cycle: 40%～60%

    Pulse frequency (Hz) in Horizontal Test: = 11Q, Q is flow rate in L/min. (Results in +/- 3% range)
    Output pulse high level Signal voltage: >4.5 V (input DC 5 V)
    Output pulse low level Signal voltage: <0.5V (input DC 5V)
    Output signal duty cycle: 40%～60%