{"product_id":"g1-2-hall-effect-water-flow-sensor-1-30lmin-5-18v-dc","title":"G1\/2 Hall Effect Water Flow Sensor 1–30 L\/min | DC 5–18V","description":"\n\u003ch2\u003eG1\/2 Hall Effect Water Flow Sensor – Accurate, Reliable \u0026amp; Easy to Install\u003c\/h2\u003e\n\u003cp\u003eKeep your water-based appliances running smoothly with this precision \u003cstrong\u003eHall Effect Water Flow Sensor\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose This Flow Sensor?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccurate Hall Effect Measurement:\u003c\/strong\u003e 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%.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFood-Grade Plastic Body:\u003c\/strong\u003e Constructed from durable, ROHS-compliant food-grade plastic that withstands water pressure up to 1.75 MPa, making it safe for potable water applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSealed, Dry Hall Sensor Housing:\u003c\/strong\u003e The internal Hall effect sensor is completely sealed and isolated from the water path, protecting electronics from moisture and ensuring long-term operational reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard G1\/2\" BSPT Thread:\u003c\/strong\u003e Integrates effortlessly into most standard plumbing and appliance fittings — no special adapters required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Compatibility:\u003c\/strong\u003e 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.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBearing-Driven Rotor:\u003c\/strong\u003e Utilizes a low-friction bearing mechanism for smooth, consistent rotation, minimizing wear and extending service life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Compact:\u003c\/strong\u003e Measuring just 62 × 36 × 36 mm, it fits easily in tight installation spaces without sacrificing performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eG1\/2 inch BSPT (External)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 5–18V (Min: DC 4.5V, Max: DC 24V)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Operating Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 mA (at DC 5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;10 mA (at DC 5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlow Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1–30 L\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eF = 7.5 × Q (L\/min) ± 2%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePulses per Litre\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e450 pulses\/L\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Water Pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.75 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35%–90% RH (non-condensing)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-25°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25%–95% RH\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFood-Grade Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e62 × 36 × 36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWire Connection Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eRed\u003c\/strong\u003e\u003c\/span\u003e — VCC (Positive Power Input)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eYellow\u003c\/strong\u003e — Signal Output (Pulse)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlack\u003c\/strong\u003e — GND (Negative \/ Ground)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eWater heaters \u0026amp; instant hot water systems\u003c\/li\u003e\n  \u003cli\u003eCoffee machines \u0026amp; espresso equipment\u003c\/li\u003e\n  \u003cli\u003eWater purifiers \u0026amp; filtration systems\u003c\/li\u003e\n  \u003cli\u003eBeverage dispensers \u0026amp; vending machines\u003c\/li\u003e\n  \u003cli\u003eSmart irrigation controllers\u003c\/li\u003e\n  \u003cli\u003eArduino\/Raspberry Pi DIY projects\u003c\/li\u003e\n  \u003cli\u003eCampus card-operated water dispensers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Note\u003c\/h3\u003e\n\u003cp\u003e⚠️ This sensor \u003cstrong\u003emust be installed in the correct water flow direction\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× G1\/2 Hall Effect Water Flow Sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-5v-12v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino (Alt)\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-inch-threaded-brass-ball-valve-water-gas-oil-flow-control\"\u003e1-Inch Threaded Brass Ball Valve – Water, Gas \u0026amp; Oil Flow Control\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on safe drinking water system components, visit the \u003ca href=\"https:\/\/www.epa.gov\/watersense\" target=\"_blank\" rel=\"nofollow\"\u003eU.S. Environmental Protection Agency – WaterSense Program\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What devices is this G1\/2 water flow sensor compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I read the flow rate output from this sensor?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this sensor safe for use with drinking water systems?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does installation direction matter?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What devices is this G1\/2 water flow sensor compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"How do I read the flow rate output from this sensor?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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. 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