# Water Flow Sensor - 1/2"

**Type:** Product page · **SKU:** SEN0217 · **Brand:** [DFRobot](https://core-electronics.com.au/brands/dfrobot-australia)
**Page:** https://core-electronics.com.au/water-flow-sensor-1-8.html ([markdown](https://core-electronics.com.au/water-flow-sensor-1-8.html.md))

The Water Flow sensor measures the rate of a liquid flowing through it. The YF-S201 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!

## Pricing

- **Price:** $17.25 (inc GST) — $15.68 AUD, exc GST
- **Quantity discounts:** 6+ $14.90 (exc GST) · 12+ $14.27 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 8 today, and up to 75 more in 8–12 days.

## Description

The Water Flow sensor measures the rate of a liquid flowing through it. The YF-S201 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!

 
Note:
\*A 20 mm rifled pipe is recommended
\*Avoid unit contact with corrosive chemicals
\*The unit must be installed vertically, tilted no more than 5 degrees
\*Liquid temperature should be less than 120 C to avoid damage to unit

**Specification**

- Inner Diameter: 11 mm
- Outside diameter: 0.78" (20 mm)
- Thread length: 1/2"
- Proof Water Pressure: <1.75 MPa
- Water Flow Range: 1-30 L/min
- Voltage Range: 5~12 V
- Operating Current: 15 mA (DC 5V)
- Insulation Resistance: >100 MΩ
- Accuracy: ±5% (2~30L/min)
- The Output Pulse High Level: >4.7 VDC (DC input voltage 5 V)
- The Output Pulse Low Level: <0.5 VDC (DC input voltage 5 V)
- Output Pulse Duty Ratio: 50% ± 10%
- Water-flow Formula: 1L = 450 square waves
- Working Humidity Range: 25% ~ 95% RH (no frost)
- Dimension: 62\*36\*35 mm/2.44\*1.37\*1.37 inches
- Weight: 52g
 
**Documents**

- [Product WIKI](https://wiki.dfrobot.com/Water_Flow_Sensor_-_1_2__SKU__SEN0217)
 
**Parts List**

- Gravity - Water Flow Sensor - 1/2" x1

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/s/e/sen0217.jpg)