{"title":"Liquid Flow Meter - Brass 1/2 Nominal Threaded","handle":"liquid-flow-meter-brass-1-2-nominal-threaded","url":"/products/liquid-flow-meter-brass-1-2-nominal-threaded","description":"This brass liquid flow meter measures water or other liquid flow using a pinwheel and Hall effect sensor. As liquid passes through the 1/2\" threaded brass body, it spins an internal pinwheel with a magnet attached. A Hall effect sensor on the outside of the tube counts the rotations through the metal wall, keeping the electronics safe and dry.\n\nEach pulse from the sensor corresponds to approximately 2 mL of liquid. Connect the three-wire output (red = 5–18V power, black = ground, yellow = pulse output) to a microcontroller and count pulses to track flow. Comes with a 3-pin JST SM connector for easy wiring.\n\nKey Features\n\n\nHall Effect Pulse Output – ~2 mL per pulse for simple flow measurement\n\nBrass 1/2\" Threaded Body – Durable construction for inline plumbing installation\n\nSafe, Dry Electronics – Magnetic sensing through the brass wall, no contact with liquid\n\nWide Voltage Range – 5–18V DC power input\n\n3-Pin JST SM Connector – Quick connect/disconnect wiring\n\n\n\nNote: This is not a precision sensor. Pulse rate varies with flow rate, fluid pressure, and sensor orientation. Calibration is recommended if better than ±10% accuracy is required.\n\n\nIdeal For\n\nGarden irrigation and watering systems\nSolar thermal and water heating monitors\nComputer liquid cooling flow monitoring\nAquarium and hydroponic flow tracking\n\n\nResources\n\nArduino Example Sketch (GitHub)\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":13842,"title":"Default Title","sku":"AF-833","price":60.85,"compare_at_price":0.0,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}