Adafruit
Liquid Flow Meter - Plastic 1/2 NPS Threaded
An inline flow sensor for measuring liquid or water flow in solar heating, computer cooling, irrigation, and other fluid projects. The sensor uses a pinwheel...
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An inline flow sensor for measuring liquid or water flow in solar heating, computer cooling, irrigation, and other fluid projects. The sensor uses a pinwheel with a magnet and an external hall effect sensor to count rotations through the plastic wall, keeping the electronics safe and dry.
Each pulse from the sensor output corresponds to approximately 2.25 millilitres of fluid. Connect the three-wire interface to any microcontroller to start tracking flow rate and total volume in your project.
Key Features
- Hall Effect Sensing – Non-contact magnetic detection through the plastic housing keeps electronics dry
- 1/2" NPS Threaded – Standard threading for easy inline installation
- Wide Voltage Range – Operates on 5–24V DC
- Simple 3-Wire Interface – Red (power), black (ground), yellow (pulse output)
- ~2.25mL per Pulse – Count pulses to calculate flow volume
Ideal For
- Garden and irrigation monitoring
- Solar heating systems
- Computer liquid cooling loops
- Aquaponics and hydroponic setups
Package Contents
- 1× Plastic liquid flow meter (1/2" NPS threaded)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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Sensors & Input
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