This DFRobot Gravity Liquid Flow Sensor is based on the electromagnetic principle. It adopts an O-ring rubber seal and uses silicone sealant at the outlet end to ensure good waterproofing. It embraces high anti-electromagnetic interference and anti-vibration capabilities, offering reliable performance and long service life. The sensor can be used with microcontrollers like the Arduino UNO to measure the flow of liquids with high concentration and low viscosity like water, diesel, engine oil, milk, paint, detergent, honey and more (no impurity in liquid). This version uses a G1/2 pipe diameter. We also offer a G1/4 version. Connection Example - Arduino Features * Gravity interface, easy to wire * Wide voltage of 3.5~24V * Measure the flow of the high-concentration but low-viscosity liquid * RoHS compliant Specifications * Operating Voltage: DC3.5~24V * Operating Current: ≤10mA (DC5V) * Output Mode: NPN pulse signal * Pipe Diameter: G1/2 * Thread I.D.: 10mm * Thread O.D.: 20.5mm * Thread Length: 29mm * Water Pressure Resistance: ≤1.2MPA * Insulation Resistance: >100MΩ * Flow Range: 30-1200L/H * Error: ±1% (5-600L/H) * Output Pulse High Level: >DC4.7V (input voltage DC5V) * Output Pulse Low Level: ＜DC0.5V (input voltage DC5V) * Output Pulse Duty Ratio: 50%±10% * Flow & Pulse Correlation: 1L=150 pulses * Operating Temperature: ≤80°C * Operating Humidity: 35%~90%RH (No condensing) * Storage Temperature: -25°~+80°C * Storage Humidity: 25%~95%RH * Dimensions: 80*47*37mm Package Contents * 1x Gravity: Liquid Flow Sensor (G1/2) Resources * Product wiki Pinout Green Wire OUT Signal Output Red Wire VCC Positive Power Supply 3.5V-24V Black Wire GND Negative Power Supply Example Arduino Code volatile double waterFlow; void setup() { Serial.begin(9600); //baudrate waterFlow = 0; attachInterrupt(1, pulse, RISING); //DIGITAL Pin 3: Interrupt 0 } void loop() { Serial.print("waterFlow:"); Serial.print(waterFlow); Serial.println(" L"); delay(500); } void pulse() //measure the quantity of square wave { waterFlow += 1.0 / 150.0; // 150 pulses=1L (refer to product specification） } https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2023-03-07 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2023-12-27 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2024-09-18 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2024-11-29 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2024-11-30 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2025-02-13 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2025-04-10 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2025-08-05 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2025-11-28 https://elecena.pl/product/22727877/gravity-liquid-flow-sensor-g1-2 2025-11-29