G1/4" Water Flow Sensor

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Water flow sensor consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow. The hall-effect sensor outputs the corresponding pulse Signal.


G14Wate Sensor.jpg


Mini. Wokring Voltage DC 4.5V
Max. Working Current 15mA(DC 5V)
Working Voltage 5V~24V
Flow Rate Range 0.3~6L/min
Load Capacity ≤10mA(DC 5V)
Operating Temperature ≤80℃
Liquid Temperature ≤120℃
Operating Humidity 35%~90%RH
Water Pressure ≤2.0MPa
Storage Temperature -25℃~+80℃
Storage Humidity 25%~95%RH

Mechanic Dimensions

Sensor Components

No. Name Quantity Material Note
1 Valve body 1 PA66+33%glass fiber
2 Stainless steel bead 1 Stainless steel SUS304
3 Axis 1 Stainless steel SUS304
4 Impeller 1 POM
5 Ring magnet 1 Ferrite
6 Middle ring 1 PA66+33%glass fiber
7 O-seal ring 1 Rubber
8 Electronic seal ring 1 Rubber
9 Cover 1 PA66+33%glass fiber
10 Screw 4 Stainless steel SUS304
11 Cable 1 1007 24AWG

Usage Example

Note: This example is done by Charles Gantt. Thanks for his contribution.Let's see how it works.

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 here. 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%. The threads are simple G3/4 so finding barbed ends will not be that hard.

Hardware Installation

You will need Arduino ,Water Flow Sensor,10K resistor,a breadboard and some jumper wires.

Wiring up the Water Flow Sensor is pretty simple. There are 3 wires: Black, Red, and Yellow. Black to the Arduino's ground pin Red to Arduino's 5v pin The yellow wire will need to be connected to a 10k pull up resistor.and then to pin 2 on the Arduino.

Here is a fritzing diagram I made to show you how to wire it all up.
Reading liquid flow rate with an Arduino.jpg
Once you have it wired up you will need to upload the following code to your Arduino. Once it is uploaded and you have some fluid flowing through the Water Flow Sensor, you can open the serial monitor and it will display the flow rate, refreshing every second.


// reading liquid flow rate using Seeeduino and Water Flow Sensor from hotmcu.com
// Code adapted by Charles Gantt from PC Fan RPM code written by Crenn @thebestcasescenario.com
// http:/themakersworkbench.com http://thebestcasescenario.com http://hotmcu.com
volatile int NbTopsFan;                       // measuring the rising edges of the signal
int Calc;
int hallsensor = 2;                           // The pin location of the sensor
void rpm ()                                   // This is the function that the interupt calls
    NbTopsFan++;                              // This function measures the rising and falling edge of the hall effect sensors signal
void setup()
    pinMode(hallsensor, INPUT);               // initializes digital pin 2 as an input
    Serial.begin(9600);                       // This is the setup function where the serial port is initialised,
    attachInterrupt(0, rpm, RISING);          // and the interrupt is attached
void loop ()
    NbTopsFan = 0;                            // Set NbTops to 0 ready for calculations
    sei();                                    // Enables interrupts
    delay (1000);                             // Wait 1 second
    cli();                                    // Disable interrupts
    Calc = (NbTopsFan * 60 / 4.5);            // (Pulse frequency x 60) / 4.5Q, = flow rate in L/hour
    Serial.print (Calc, DEC);                 // Prints the number calculated above
    Serial.print (" L/hour\r\n");             // Prints "L/hour" and returns a  new line

Wiring Diagram

The external diameter of thread the connections use is 1.4mm.


Output Table

Pulse frequency (Hz) in Horizontal Test= 73Q, 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)
Precision 3% (Flow rate from 1L/min to 10L/min)
Output signal duty cycle 40%~60%



people can go here to find questions and answers for this kind of products.

What materials is water flow sensor made of?
Nylon with fiber, avoiding strong acid and strong base.

Is the water flow sensor safe for drinking water?
Yeah, it has been used on drinking machine.

What thread type does this sensor have? British or NPT?
It has BSP thread. We have two kinds of water sensors. The black is standard(Thread major diameter) and the white one is smaller(Thread minor diameter). You can refer to BSP details.


See Also

Other related products and resources.


This documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0 Source code and libraries are licensed under GPL/LGPL, see source code files for details.

External Links

Links to external webpages which provide more application ideas, documents/datasheet or software libraries.

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