Description:
3/4 inch Water Flow Sensor – YFS403
The YFS403 5-18V Water Flow Sensor is composed of a plastic valve, a water flow rotor assembly, and a Hall sensor. The magnetic rotor rotates and its speed varies with the flow rate. The Hall sensor outputs a pulse signal that corresponds to the speed of the rotor. The controller receives the signal and determines the water flow size and control.
The sensor is installed at the hot water inlet to detect the water flow. When water passes through the rotor assembly, the magnetic rotor spins and its speed changes with the flow. The Hall sensor sends a pulse signal that matches the rotor speed to the controller, which then controls the flow. The sensor can be used for water heaters, card machines, water vending machines, and flow measurement devices.
Wire Connections:
- Red: Positive (+)
- Yellow: Signal output.
- Black: Negative (-)
Note: Product may vary from images shown in terms of Wire Color according to the availability.
Applications:
- This product can be used in water heating systems, automatic water dispensers, and other flow metering equipment.
Features:
- Lightweight, small size, easy to install.
- Inlaid with stainless steel impeller shaft, durable wearable.
- The seal ring with the upper and lower force structure never leaks.
- Non-violent shock, and chemical erosion.
- Non-throwing or hitting.
- Mounted vertically, should not exceed 5 degrees inclination.
- The temperature of the medium should not exceed 120 ℃.
Specifications:
| Working voltage | 3.5-24 DC |
|---|---|
| Load capacity | ≤ 10 mA |
| Input Diameter | Outside-26mm Inside-12 mm |
| Output Diameter | Outside-26mm Inside-14mm |
| Pressure | ≤1.2MPa |
| Working humidity range | 35%-90% RH |
| Flow range | 1-30L / min |
| Width (mm): | 62 |
| Height (mm): | 41 |
| Weight (g): | 35 |
Package Includes
- 1 x YFS403 5-18V Water Flow Sensor Flowmeter G3/4 1- 30L/Min
3/4 inch Water Flow Sensor – YFS403 Overview
The 3/4 inch Water Flow Sensor – YFS403 is a pulse-output flow meter designed to measure liquid flow in pipelines. It uses a stainless steel–inlaid impeller and Hall effect sensor to generate pulses proportional to water velocity, ideal for precise flow monitoring and control.
Key Features of 3/4 inch Water Flow Sensor – YFS403
- Wide operating voltage 3.5-24DC V for flexible integration
- Low power draw: ≤ 10 mA at 5 V ensures minimal load on controllers
- High-temperature tolerance: stable performance up to 80 °C
- Durable impeller shaft inlaid with stainless steel for wear resistance
- Leak-proof seal ring design with top-and-bottom support structure
- Compact, lightweight housing for easy mounting in tight spaces
- Genuine product, fast shipping from Zbotic
Applications and Use Cases
- Water heaters: monitor inlet flow to trigger heating cycles
- Water vending machines: measure dispensed volume for billing
- Card-operated laundries: detect water usage per cycle
- Irrigation systems: track flow rates for drip and sprinkler lines
- Aquarium and hydroponics: ensure consistent water circulation
- DIY projects and industrial automation requiring flow feedback
How to Use 3/4 inch Water Flow Sensor – YFS403
Install the YFS403 inline at the water inlet, ensuring flow direction matches the arrow on the housing. Connect the red and black wires to a 5–18 V DC supply, and route the signal wire to a microcontroller or flow meter display. Once powered, count the Hall sensor pulses to calculate flow rate, then apply a calibration factor to convert pulses per second into litres per minute.
Why Buy from Zbotic?
- Genuine Products: All items sourced from authorized distributors
- Fast Shipping: Orders ship within 24 hours with tracking (non backordered products)
- Free Shipping: Free delivery on qualifying orders
- COD Available: Cash on Delivery, UPI, cards, net banking
- Technical Support: Expert help for setup and troubleshooting
- Easy Returns: Hassle-free replacement for defective products
Frequently Asked Questions
What flow range does the YFS403 support?
The YFS403 reliably measures flow rates from approximately 1 L/min up to 30 L/min, depending on system pressure and temperature.
How do I convert sensor pulses to flow rate?
Each pulse corresponds to a fixed volume (about 2.25 mL). Count pulses per second, multiply by 2.25 mL, then convert to litres per minute for flow rate.
Can this sensor handle hot water applications?
Yes, the YFS403 is rated for liquids up to 80 °C, making it suitable for hot water systems, provided installation prevents steam exposure.
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Read More →Technical Specifications
| Model | YFS403 |
|---|---|
| Display Size | 4" |
| SKU | AI0589 |
| Weight | 0.06 kg |
| Availability | In Stock |
Applications & Use Cases
The 3/4 inch Water Flow Sensor - YFS403 is a versatile flow used across a wide range of applications including water quality monitoring, hydroponics, aquariums, industrial water treatment, and smart irrigation.
Common use cases:
- Measuring TDS in a hydroponic nutrient solution
- Monitoring pH in an aquarium
- Tracking water flow in an irrigation system
This product is ideal for aquaculture professionals, hydroponic growers, and environmental engineers.
Technical Tip: Calibrate pH and TDS sensors regularly with standard solutions. Keep probe tips clean and submerged when not in use.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
Arun Patil –
Decent 3/4 inch Water Flow Sensor – for the price. Requires proper wiring but works well once set up.
Diya Khanna (verified owner) –
Pretty good 3/4 inch Water Flow Sensor -. Documentation could be better but the sensor itself is solid.
Uday Nair –
Very satisfied with this 3/4 inch Water Flow Sensor -. Library support is good and it’s easy to interface.
Tarun Nayak (verified owner) –
This 3/4 inch Water Flow Sensor – is excellent for the price. My data logging project is working perfectly now.
Tejas Mukherjee (verified owner) –
This 3/4 inch Water Flow Sensor – is a must-have for sensor projects. Plug and play with Arduino.
Rashmi Gill (verified owner) –
Superb 3/4 inch Water Flow Sensor -! Using it in my environmental monitoring system. Very reliable data.
Sahil Dhillon (verified owner) –
This 3/4 inch Water Flow Sensor – is a must-have for sensor projects. Plug and play with Arduino.
Vivek Solanki (verified owner) –
Good 3/4 inch Water Flow Sensor -. Works as described. Calibration needed some patience but results are good.
Paras Garg (verified owner) –
Excellent sensitivity and range on this 3/4 inch Water Flow Sensor -. Works better than I expected.
Pooja Saxena –
This 3/4 inch Water Flow Sensor – works great with Arduino. Easy to wire up and code.
Tanmay Bhatt (verified owner) –
Decent 3/4 inch Water Flow Sensor – for the price. Requires proper wiring but works well once set up.
Tanvi Bose (verified owner) –
Average 3/4 inch Water Flow Sensor -. Readings fluctuate a bit. Works for rough measurements.
Abhishek Khurana (verified owner) –
Excellent sensitivity and range on this 3/4 inch Water Flow Sensor -. Works better than I expected.
Rohit Rao (verified owner) –
Pretty good 3/4 inch Water Flow Sensor -. Documentation could be better but the sensor itself is solid.
Ankit Negi –
Pretty good 3/4 inch Water Flow Sensor -. Documentation could be better but the sensor itself is solid.
Bharat Vyas (verified owner) –
Nice 3/4 inch Water Flow Sensor -. Readings are mostly accurate. Good enough for my hobby project.
Tanya Shah (verified owner) –
Great 3/4 inch Water Flow Sensor -. Using it in my smart agriculture system. Reliable measurements every time.
Harshit Shah (verified owner) –
Decent 3/4 inch Water Flow Sensor – for the price. Requires proper wiring but works well once set up.
Rajesh Bajaj (verified owner) –
Perfect for my weather station. This 3/4 inch Water Flow Sensor – gives consistent readings day and night.
Simran Kumar (verified owner) –
Good quality 3/4 inch Water Flow Sensor -. Some variation in readings but within acceptable range.