Skip to product information
1 of 3


1/4 Inch Water Flow Sensor YF - S402

1/4 Inch Water Flow Sensor YF - S402

Regular price Rs. 302
Regular price Rs. 441 Sale price Rs. 302
Sale Sold out 32% off Best Price Guaranteed
You save Rs. 139 | Free Shipping on Orders Above ₹ 499/-
Incl. GST (No Hidden Charges)
Currently, people are actively checking out this product.


FLAT ₹ 100/- OFF RC100

When you shop for ₹ 2500 or more.Applicable on Checkout.

*Coupons are not applicable on Original Boards and Kits

Submit your Bulk Enquiry Here

Contact form

  • The waterflow sensor is compact and is easy to install.
  • The YF - S402 waterflow sensor has high sealing performance and high quality hall effect sensor.
  • RoHS Compliant and working range : 0.3 - 6 l/min.
  • Sealing ring design to prevent water leaks.
  • With stainless steel axis in the wheel, abrasion resistant

1/4 Inch Water Flow Sensor YF - S402

The YF-S402 water flow sensor is a device that is used to measure the flow rate of water. It consists of a turbine-type rotor that is placed in the water stream, and as the water flows past the rotor, it causes the rotor to spin. The sensor measures the speed of the rotor and converts it to a flow rate. The sensor has a digital output, which means that it provides a digital signal that can be read by a microcontroller or other host device. The frequency of the pulses is proportional to the flow rate of the liquid passing through the sensor. That digital signal, whose frequency is in the range between 0Hz and 100Hz, can be read directly through one of the digital input/output pins of a microcontroller. ID 8.5mm / OD 11mm.
The water flow sensor measures the rate of a liquid flowing through it. The YF-S402C water flow sensor consists of a plastic valve body, flow rotor, and hall effect sensor. It is usually used at the inlet end to detect the amount of flow. When liquid flows through the sensor, a magnetic rotor will rotate and the rate of rotation will vary with the rate of flow. The hall effect sensor will then output a pulse width signal. Connect it to a microcontroller and you can monitor multiple devices such as your coffee maker, sprinkler, or anything else, and control the water flow rate to suit your needs.

Package Includes:

  • 1 x Water Flow Sensor YF - S402


Sensor Type  Water Flow Sensor 
Model  YF - S402
Frequency Range  0Hz and 100Hz
Inlet diameter 8mm
Outlet diameter 11mm
Dimensions  5 x 4 x 3 cms 
Weight  50 grams

Shipping & Returns

  • All orders confirmed before 3 pm IST are shipped on the
    same day, barring rare pickup delays on holidays or disturbances
  • Delivery time in Metro cities is 1-3 days, Others it is
    3-7 days. It varies based on location, reliant on courier services
  • Return window: 7 days from receipt unless stated
    otherwise. No refunds/replacements after
  • Returns only for non-working/damaged products are accepted
  • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
  • Refunds are processed within 3-4 working days post inspection and approval.

For more details, please check our Shipping and Return Policy

View full details

People Also Buy

Found a better price?

Let us know!
We'll try to match the price for you

  • ⚡ Dispatched within 24 hours

  • 💰 Earn RC Coins on every purchase

  • 🚚 Free shipping on orders above Rs 500/-

  • 🛠️ Dedicated Technical Support Team

1 of 4

1. How does a water flow sensor work?

  • The water flow sensor is made up of a plastic valve through which water can flow. A water rotor and a hall effect sensor are used to detect and measure water flow. When water flows through the valve, it causes the rotor to rotate. 

2. Where are water flow sensors used?

  • The water flow sensors are used to monitor the amount of water being supplied and used, and the rate of flow of water has to be measured. Water flow sensors are installed at water sources or pipes to measure the rate of flow and calculate the volume of water flowing through the pipe.

3. What is a water flow sensor?

  • This water flow sensor is used to measure a small quantity of water. It consists of a small turbine whose output signal is a series of digital pulses. The pulse frequency is proportional to the flow rate of the liquid through the sensor.