YF Water Flow Sensor (YF-S201) – KSH 800 at HIMASTORES Mombasa – best electronics in Kenya
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YF Water Flow Sensor (YF-S201)

SKU: HMJ059 Category: Sensors
KSH 800.00
In Stock

Product Description

YF Water Flow Sensor (YF-S201)

Liquid Flow Measurement for Arduino and Automation Projects

The YF-S201 water flow sensor is an affordable Hall Effect based device that measures liquid flow rate by counting pulses from a rotating magnetic rotor [citation:3][citation:9]. Ideal for monitoring water consumption, coffee machines, and automated irrigation systems [citation:2][citation:6].

Hall Effect Pulse Output - Measures flow rate via frequency pulses proportional to liquid flow [citation:5]
Wide Measurement Range - Flow rate from 1 to 30 liters per minute [citation:6]
Operating voltage is 5V to 18V DC with max current 15mA at 5V [citation:2][citation:5]
Use external interrupt pin (e.g., D2 on Arduino) for accurate pulse counting [citation:8]
Must be installed vertically with max 5° tilt to ensure proper operation [citation:6][citation:9]

Technical Specifications

ParameterValue
ModelYF-S201 [citation:5]
Flow Rate Range1-30 L/min [citation:6]
Output Pulse CharacteristicFrequency (Hz) = 7.5 × Flow Rate (L/min) [citation:5][citation:8]
Pulses per Liter450 [citation:6][citation:9]
Operating Voltage5 to 18V DC [citation:5]
Max Current15mA at 5V [citation:2][citation:6]
Accuracy±5% (2-30 L/min range) [citation:6][citation:9]
Max Water Pressure1.75 MPa [citation:6][citation:9]
Operating Temperature-25°C to +80°C [citation:5][citation:6]

= Key Features =

+Hall Effect Sensing Principle - Sealed magnetic rotor generates electrical pulses proportional to flow [citation:3][citation:9]

+Stainless Steel Shaft - Durable impeller construction for long service life [citation:1][citation:4]

+Simple 3Wire Interface VCC (red), GND (black), Pulse Output (yellow) [citation:2][citation:4]

= Applications =

  1. Automated irrigation and plant watering systems [citation:6][citation:9]
  2. Coffee machines and beverage dispensers [citation:4][citation:6]
  3. Water consumption monitoring and leak detection
  4. Industrial cooling and filling systems [citation:1][citation:2]
Affordable Flow Monitoring Lowcost solution for Arduino automation projects [citation:6]
Straightforward Integration - Works with Arduino UNO, ESP32, and Raspberry Pi [citation:3][citation:8]

√ Compatible with 1/2" standard pipe fittings [citation:11]

√ Sealed design protects electronics from moisture [citation:5]

√ G1/2 male thread for easy installation [citation:1][citation:2]

Connection Guide

YF-S201 to Arduino:

  • Red wire: 5V power
  • Black wire: GND
  • Yellow wire: Digital pin (e.g., D2 with interrupt) [citation:8]
Use a 10kΩ pull-up resistor on the signal line for stable readings
Each pulse corresponds to approximately 2.25 mL of water [citation:5]

Troubleshooting

No pulse output:

  • Check power supply (5-18V DC)
  • Verify water flows in correct direction (arrow on body)
  • Ensure sensor is not clogged with debris

Inaccurate readings:

  • Maintain vertical installation (max 5° tilt)
  • Calibrate pulse factor for your specific sensor
  • Avoid high pressure or exceeding max flow rate