--- product_id: 542296269 title: "1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible" price: "€ 18.68" currency: EUR in_stock: true reviews_count: 3 url: https://www.desertcart.at/products/542296269-1-2-flow-hall-sensor-with-npt-thread-1-30l store_origin: AT region: Austria --- # 450 pulses/L output precision 1-30 L/min flow range NPT Thread for secure fit 1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible **Price:** € 18.68 **Availability:** ✅ In Stock ## Summary > 💧 Flow smarter, not harder — precision water sensing for the connected pro. ## Quick Answers - **What is this?** 1/2 ’’ Flow Hall Sensor with NPT Thread, 1-30L/Min Flow Meter, Flowmeter Counter, Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible - **How much does it cost?** € 18.68 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/542296269-1-2-flow-hall-sensor-with-npt-thread-1-30l) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable & Safe Design:** Sealed sensor keeps electronics dry and safe, operating reliably up to 80°C and 1.75 MPa pressure. - • **Precision Pulse Output:** Integrated Hall effect sensor delivers 450 pulses per liter for ultra-accurate flow measurement. - • **Plug & Play Integration:** Seamlessly compatible with Arduino and Raspberry Pi for smart, connected water monitoring. - • **Wide Flow Compatibility:** Handles 1 to 30 liters per minute, perfect for everything from coffee machines to reverse osmosis filters. - • **Easy Installation with NPT Thread:** Standard 1/2’’ NPT threading ensures a leak-resistant, professional-grade setup. ## Overview The SENSTREE 1/2’’ Flow Hall Sensor features a robust NPT threaded design supporting 1-30 L/min flow rates with ±2% accuracy. Its integrated magnetic Hall effect sensor outputs 450 pulses per liter, enabling precise digital flow measurement compatible with Arduino, Raspberry Pi, and reverse osmosis systems. Engineered for durability, it operates safely up to 80°C and 1.75 MPa water pressure, making it ideal for smart water heaters, purifiers, and beverage machines. ## 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: Works - Sick 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 | |---------------|-------| | Customer Reviews | 4.7 out of 5 stars 18 Reviews | ## Images ![1/2 ’’ 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 ### ⭐⭐⭐⭐⭐ Works *by A***R on June 12, 2026* Sick ### ⭐⭐⭐ 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. ### ⭐⭐⭐⭐⭐ Great *by M***E on June 5, 2026* Works great ## 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.at/products/542296269-1-2-flow-hall-sensor-with-npt-thread-1-30l](https://www.desertcart.at/products/542296269-1-2-flow-hall-sensor-with-npt-thread-1-30l) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-11-01*