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G1/2 Hall Effect Water Flow Sensor 1–30 L/min | DC 5–18V
G1/2 Hall Effect Water Flow Sensor 1–30 L/min | DC 5–18V
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G1/2 Hall Effect Water Flow Sensor – Accurate, Reliable & Easy to Install
Keep your water-based appliances running smoothly with this precision Hall Effect Water Flow Sensor. Designed for a wide range of household and commercial equipment — from water heaters and coffee machines to water purifiers and beverage dispensers — this compact sensor delivers consistent, accurate flow measurement every time.
Made in Mainland China.
Why Choose This Flow Sensor?
- Accurate Hall Effect Measurement: Generates an electrical pulse with every rotor revolution, providing reliable flow data across a 1–30 L/min range with high linearity of F = (7.5 × Q) ± 2%.
- Food-Grade Plastic Body: Constructed from durable, ROHS-compliant food-grade plastic that withstands water pressure up to 1.75 MPa, making it safe for potable water applications.
- Sealed, Dry Hall Sensor Housing: The internal Hall effect sensor is completely sealed and isolated from the water path, protecting electronics from moisture and ensuring long-term operational reliability.
- Standard G1/2" BSPT Thread: Integrates effortlessly into most standard plumbing and appliance fittings — no special adapters required.
- Wide Voltage Compatibility: Operates on DC 5–18V (rated up to 24V), making it compatible with Arduino, Raspberry Pi, microcontrollers, and a broad range of industrial and consumer electronics.
- Bearing-Driven Rotor: Utilizes a low-friction bearing mechanism for smooth, consistent rotation, minimizing wear and extending service life.
- Lightweight & Compact: Measuring just 62 × 36 × 36 mm, it fits easily in tight installation spaces without sacrificing performance.
Technical Specifications
| Thread Size | G1/2 inch BSPT (External) |
| Operating Voltage | DC 5–18V (Min: DC 4.5V, Max: DC 24V) |
| Max Operating Current | 15 mA (at DC 5V) |
| Load Capacity | <10 mA (at DC 5V) |
| Flow Range | 1–30 L/min |
| Output Frequency | F = 7.5 × Q (L/min) ± 2% |
| Pulses per Litre | 450 pulses/L |
| Max Water Pressure | 1.75 MPa |
| Operating Temperature | Up to 80°C |
| Operating Humidity | 35%–90% RH (non-condensing) |
| Storage Temperature | -25°C to +80°C |
| Storage Humidity | 25%–95% RH |
| Material | Food-Grade Plastic |
| Color | Black |
| Dimensions | 62 × 36 × 36 mm |
Wire Connection Guide
- Red — VCC (Positive Power Input)
- Yellow — Signal Output (Pulse)
- Black — GND (Negative / Ground)
Compatible Applications
- Water heaters & instant hot water systems
- Coffee machines & espresso equipment
- Water purifiers & filtration systems
- Beverage dispensers & vending machines
- Smart irrigation controllers
- Arduino/Raspberry Pi DIY projects
- Campus card-operated water dispensers
Installation Note
⚠️ This sensor must be installed in the correct water flow direction as indicated on the housing. Incorrect orientation will result in no signal output. Ensure the flow direction arrow on the sensor body aligns with your system's water flow.
Package Contents
- 1× G1/2 Hall Effect Water Flow Sensor
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For more information on safe drinking water system components, visit the U.S. Environmental Protection Agency – WaterSense Program.
Frequently Asked Questions
Q: What devices is this G1/2 water flow sensor compatible with?
A: This Hall effect water flow sensor is compatible with a wide range of appliances and systems, including water heaters, coffee machines, water purifiers, beverage dispensers, campus card-operated water stations, and Arduino/Raspberry Pi DIY electronics projects. It operates on DC 5–18V, making it highly versatile.
Q: How do I read the flow rate output from this sensor?
A: The sensor outputs a digital pulse signal with a frequency formula of F = 7.5 × Q, where Q is the flow rate in litres per minute. At 1 L/min, the output is 7.5 Hz (450 pulses per litre). Connect the yellow signal wire to a microcontroller input and use a pulse-counting routine to calculate the flow rate in real time.
Q: Is this sensor safe for use with drinking water systems?
A: Yes. The sensor body is made from food-grade, ROHS-compliant plastic, making it suitable for use in potable water applications such as water purifiers and drinking water dispensers. The internal Hall effect electronics are fully sealed and never come into contact with the water passing through the sensor.
Q: Does installation direction matter?
A: Yes — the sensor must be installed so that the water flows in the direction indicated by the arrow on the housing. Installing it backwards will result in no signal output. Always follow the directional marking during setup for correct operation.
