--- product_id: 143719307 title: "1/2\" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2）" brand: "gredia" price: "€ 37.18" currency: EUR in_stock: true category: "Gredia" url: https://www.desertcart.at/products/143719307-1-2-water-flow-sensor-food-grade-switch-hall-effect store_origin: AT region: Austria --- # DC 5-24V wide voltage 1-30 L/min flow range G1/4 inch male thread fit 1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） **Brand:** gredia **Price:** € 37.18 **Availability:** ✅ In Stock ## Summary > 💧 Flow with confidence, measure with precision! ## Quick Answers - **What is this?** 1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） by gredia - **How much does it cost?** € 37.18 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/143719307-1-2-water-flow-sensor-food-grade-switch-hall-effect) ## Best For - gredia enthusiasts ## Why This Product - Trusted gredia brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Pack Advantage:** Two sensors included to double your monitoring power or backup your system seamlessly. - • **Food-Grade Durability:** Crafted from ROHS-compliant, food-safe plastic for safe water and beverage applications. - • **Precision Flow Control:** ±2% accuracy ensures reliable liquid measurement for your smart devices. - • **Versatile Compatibility:** Ideal for coffee machines, water purifiers, beverage dispensers, and smart campus equipment. - • **Plug & Play Installation:** Compact, lightweight design with secure sealing ring for effortless setup and leak-free operation. ## Overview This 1/2" Water Flow Sensor features a hall effect switch with a 1-30 L/min flow range, operating at DC 5-24V and up to 1.75MPa pressure. Made from food-grade, ROHS-compliant plastic, it ensures safe, accurate fluid measurement for water heaters, coffee machines, purifiers, and more. The pack includes two easy-to-install sensors with secure G1/4" threading and reliable leak-proof sealing. ## Description Our products are fine made with nice materials and good workmanship, strict quality control, guarantee in after service. The flowmeter is light and handy, easy to install. The sealing ring make the connection firm, the sealing performance is good and the problem of water leakage is avoided. More details about the flow meter: F=（7.5*Q）±2%, Q=L/Min, error: ±2% Working range: 1-30L/min Working voltage: DC 5-24 V Water Pressure: ≤1.75Mpa Liquid temperature: 0-100℃ Maximum current consumption: 15 mA(DC 5V) Wire length: 15 cm Size: 62mm x 36mm x 36mm(L*W*H) Refer to the wiring: Red wire: VCC(+) Black wire: GND(-) Yellow wire: Signal output Package: 2 x G1/4 inch flowmeter ## Features - Connect to G1/4 inch male thread, hall effect, comes with 2 pieces - Flow range:1-30L/min, Water Pressure: ≤1.75Mpa - Working voltage: DC 5-24 V, F=（7.5*Q）±2%, Q=L/Min - Material: food grade plastic, all raw materials conform to the ROHS test standard - Wide application: It is mainly used in water heater, coffee machine, water purifier, drinking fountain, beverage machine, campus smart card equipment, etc. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07RG4KXWJ | | Best Sellers Rank | #62,523 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #30 in Flowmeters | | Date First Available | May 2, 2019 | | Item Weight | 3.52 ounces | | Item model number | GR-201P2 | | Manufacturer | GREDIA | | Package Dimensions | 7.13 x 4.61 x 1.38 inches | ## Images ![1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） - Image 1](https://m.media-amazon.com/images/I/61nLiOnDsJL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: If the output signal is a pulse, what is the pulse rate per liter and duration per pulse?** A: The current image shows an "F" number of 7, which means 7Hz per liter/min, so 7 pulses per second indicates a flow rate of 1 liter/minute, hence 7 * 60 seconds/minute = 420 pulses per liter (per minute). I have no idea what the duration would be. **Q: Does it prevent back flow or what happens if water does try to go in wrong direction?** A: It does not have any backflow prevention. It is a little water wheel inside a pipe which has magnets in the vanes of the water wheel. The unit simply counts magnetic pulses as the wheel is moved by the water flow. It would probably register water flow either way but would only be accurate in the forward flow direction. Any domestic water system should have backflow preventers in place to keep drinking water contamination from occuring. **Q: Are the threads npt, bspt or bspp? please understand this is basic info should always be provided without having to specifically ask. thanks.** A: Hello, thank you for your inquiry. It's BSPT. **Q: If the flow rate is less than 1L/minute, will it not not show any pulses? I'm interested in using this to detect leaks and 1L/min is a lot of water.** A: I don't know about 1L/min, but I have tried pumping liquid through one using a dosing pump and nothing registered. The water wheel will have some resistance, so a very slow flow might not register. ## Frequently Bought Together - GREDIA 1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） - Ximimark 2Pcs 1/2" Thread Plastic Electric Solenoid Valve Water Inlet Flow Switch Magnetic Water Air Normally Closed Tools DC 12V N/C 0.02 to 0.8mpa - GREDIA 1/2" DC 12V Solenoid Valve N/C Normally Closed Water Inlet Flow Switch --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/143719307-1-2-water-flow-sensor-food-grade-switch-hall-effect](https://www.desertcart.at/products/143719307-1-2-water-flow-sensor-food-grade-switch-hall-effect) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-10-10*