Water Flow Sensor Details

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.

Flow gauges typically output a series of pulses proportional to the instantaneous flow rate .This means that to interpret them it’s necessary to implement a simple frequency counter.

This is actually the same way many car speedometers work: a wheel sensor outputs a pulse for each rotation of a wheel which means the pulse frequency varies proportionally to the vehicle speed.

The speedo then displays a scaled version of the current pulse frequency to show instantaneous speed while the odometer displays a scaled cumulative pulse count to show distance traveled – both pieces of information are based on the same underlying data but they are recorded and displayed in different ways.

This water flow sensor outputs approx. 4.5 pulses per second per litre of flow per minute. It means , at 10 litres per minute , the sensor will output 45 pulses per second.

By measuring the pulse frequecy and dividing by 4.5 (or multiplying by 0.22) we can determine the current flow rate in litres per minute.

The flow sensor is made from a strong reinforced plastic material & has a 0.5 inch thread on each end so it can be screwed into standard plumbing fittings.

Fluid Flow Sensor – G1/2 – 1-30 L/Min – 1.75 MPa
This liquid flow rate sensor can be used for flow rate of upto 30 L/Min. Liquid pressure can be as high as 1.75 MPa. This liquid flow sensor can be used in variety of applications such as beverage, mineral water vending machines. Automatic flow control automation applications.
Size (L x W x H) Centi Meters 5.6 x 3.5 x 3.5
Color Black
Connections RED – Positive, Black – Ground, Yellow – Pulse
Maximum Liquid Pressure 1.75 MPa
Max flow rate 30 L/min
Connecting Cable Length 10 CM
Pipe connection Pipe Dia 1.9 cm Outer Dia, 1.1cm Inner Dia

Installation Notes:-
Always install the sensor in vertical position with tilt not greater than 5 degree.
Maximum Temperature of Liquid should not exceed 120 Degree Celcius.


Subramanian MK, currently serving as a workshop instructor at Sakthi Polytechnic College, Erode Tamil Nadu. With a career spanning 25 + years, Subramanian MK has dedicated himself to advancing knowledge in Electronics and Communication Engineering (ECE). His passion for exploring new technologies has led to the development of numerous projects, showcasing expertise in IoT and PCB design.

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