--- product_id: 542296269 title: "G1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible" brand: "senstree" price: "£9.90" currency: GBP in_stock: true reviews_count: 1 category: "Senstree" url: https://www.desertcart.co.uk/products/542296269-g1-2-flow-hall-sensor-with-npt-thread-1-30l store_origin: GB region: United Kingdom --- # Integrated sealed Hall effect sensor G1/2’’ NPT (BSP) threaded fitting 1-30L/min precision flow range G1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible **Brand:** senstree **Price:** £9.90 **Availability:** ✅ In Stock ## Summary > 💧 Flow smarter, not harder — precision sensing for the connected pro. ## Quick Answers - **What is this?** G1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible by senstree - **How much does it cost?** £9.90 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/542296269-g1-2-flow-hall-sensor-with-npt-thread-1-30l) ## Best For - senstree enthusiasts ## Why This Product - Trusted senstree brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable & Safe Design:** Sealed magnetic Hall sensor ensures dry, corrosion-free operation up to 80°C. - • **Universal Compatibility:** Seamlessly integrates with Arduino, Raspberry Pi, and RO filters for smart automation. - • **Precision Flow Monitoring:** Accurately measures 1-30L/min with ±2% error for reliable system control. - • **Compact & Easy Installation:** Lightweight, nimble design with G1/2’’ NPT thread fits most water systems effortlessly. - • **Pulse Output for Smart Analytics:** Generates 450 pulses/liter enabling real-time digital flow data for advanced monitoring. ## Overview The SENSTREE G1/2’’ Flow Hall Sensor is a compact, high-precision water flow meter designed for 1-30L/min range with ±2% accuracy. Featuring a sealed magnetic Hall effect sensor and G1/2’’ NPT (BSP) threaded fitting, it’s compatible with Arduino, Raspberry Pi, and reverse osmosis systems. Ideal for smart water heaters, coffee machines, and purifiers, it outputs 450 pulses per liter for seamless digital integration. Note: BSP threading requires compatible fittings or adapters. ## Description SENSTREE G1/2 ’’ Flow Hall Sensor with NPT thread, 1-30L/Min Flow Meter, Food Grade Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter CompatibleSpecifications: Frequency: F=7.5 * Q (L / Min) error: ± 2% , current can not exceed 10mA, 450 output pulses/liters. F=onstant * units of flow (L / min) * time (seconds) Flow range:1-30L/minMaximum current:10 mA(DC 5V) Working voltage range: DC 5-18 VLoad capacity: ≤10 mA(DC 5V) Operating Temp: ≤80℃. Operating humidity: 35%-90%RHAllow compression: Water pressure 1.75 Mpa belowInsulation resistance: >100M OHMStorage Temperature: -25-80℃Storage humidity: 25%-95%RHOutput Waveform: square wave, output pulse signal. Cable length:15cm. It is mainly used in water heaters, coffee machines, water purifiers, drinking fountains, beverage machines, campus smart card equipment, etc. Refer to the wiring: Red wire: VCC(+)Black wire: GND(-)Yellow wire: Signal output Review: Leaks badly with compression fittings. - This fitting leaks, when connected to a PEX-B plastic swivel connector. The reason it leaks is because the swivel connector is a COMPRESSION fitting, which is not compatible with this type of plastic fitting. It will work with NPT (and teflon/pipe dope) but it will NOT work with any compression fitting. It's because the thickness of the RIM of the threaded fitting. The rim is thinner with a BRASS fitting, so I ordered the brass version, and it worked fine. NOTE that I use other plastic fittings with my PEX-B swivels, but I don't know why only this fitting just doesn't fit. UPDATE I found out that the threads use BSP (british standard thread) and that's why it doesn't fit. To make this work, it will be necessary to get an adapter 1/2 BSP Female x 1/2 NPT male. Very frustrating this info is not given, you just need to know that "G" refers to BSP, which is not available most places in the USA. On testing I found that this device becomes progressively more inaccurate as flow rate decreases below 1L/min. Below about 0.1 L/min it won't spin at all, and reads zero. The accuracy goes from 100% to 0% linearly between 1.0 and 0.1. Fair enough. Now I know the plumbing, i'd say this is a pretty good device, works as expected, but won't work for me, because in my RV, flow rates are mostly below 1L/min. ## Features - NPT Thread - 1-30L/min - The Water Flow Sensor is light, has a nimble outline, small, and is easy to install—the bearings used in the rotating part. - There is an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry. - Installed by flow direction in the product, otherwise, there is no signal output. - It is mainly used in water heaters, coffee machines, water purifiers, drinking fountains, beverage machines, campus smart card equipment, etc. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CC949527 | | Best Sellers Rank | #61,365 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #35 in Flowmeters | | Date First Available | July 19, 2023 | | Item Weight | 1.76 ounces | | Manufacturer | SENSTREE | | Package Dimensions | 3.23 x 2.4 x 1.46 inches | ## Images ![G1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible - Image 1](https://m.media-amazon.com/images/I/51BtxVE-lxL.jpg) ## Customer Reviews ### ⭐⭐⭐ Leaks badly with compression fittings. *by T***T on June 10, 2025* This fitting leaks, when connected to a PEX-B plastic swivel connector. The reason it leaks is because the swivel connector is a COMPRESSION fitting, which is not compatible with this type of plastic fitting. It will work with NPT (and teflon/pipe dope) but it will NOT work with any compression fitting. It's because the thickness of the RIM of the threaded fitting. The rim is thinner with a BRASS fitting, so I ordered the brass version, and it worked fine. NOTE that I use other plastic fittings with my PEX-B swivels, but I don't know why only this fitting just doesn't fit. UPDATE I found out that the threads use BSP (british standard thread) and that's why it doesn't fit. To make this work, it will be necessary to get an adapter 1/2 BSP Female x 1/2 NPT male. Very frustrating this info is not given, you just need to know that "G" refers to BSP, which is not available most places in the USA. On testing I found that this device becomes progressively more inaccurate as flow rate decreases below 1L/min. Below about 0.1 L/min it won't spin at all, and reads zero. The accuracy goes from 100% to 0% linearly between 1.0 and 0.1. Fair enough. Now I know the plumbing, i'd say this is a pretty good device, works as expected, but won't work for me, because in my RV, flow rates are mostly below 1L/min. ## Frequently Bought Together - SENSTREE G1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible - CQRobot TDS (Total Dissolved Solids) Meter Sensor Compatible with Raspberry Pi/Arduino Board. for Liquid Quality Analysis Teaching, Scientific Research, Laboratory, Online Analysis, etc. - BOJACK DS18B20 Temperature Sensor Module Kit with Waterproof Stainless Steel Probe for Raspberry Pi --- ## 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.co.uk/products/542296269-g1-2-flow-hall-sensor-with-npt-thread-1-30l](https://www.desertcart.co.uk/products/542296269-g1-2-flow-hall-sensor-with-npt-thread-1-30l) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-23*