---
product_id: 723152885
title: "1/2\" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2）"
brand: "gredia"
price: "¥15073"
currency: JPY
in_stock: true
reviews_count: 3
category: "Gredia"
url: https://www.desertcart.jp/products/723152885-1-2-water-flow-sensor-food-grade-switch-hall-effect
store_origin: JP
region: Japan
---

# DC 5-24V wide voltage 1-30L/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:** ¥15073
**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?** ¥15073 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/723152885-1-2-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 Value:** Two flowmeters included to double your efficiency and backup readiness
- • **Food-Grade Safety:** Crafted from ROHS-certified, food-safe plastic for pure, contaminant-free flow
- • **Precision Flow Control:** Accurate ±2% measurement for flawless fluid management
- • **Versatile Compatibility:** Ideal for coffee machines, water purifiers, beverage dispensers, and smart campus devices
- • **Plug & Play Installation:** Lightweight design with secure sealing ring prevents leaks and speeds setup

## Overview

This 1/2" Water Flow Sensor features a hall effect switch with a 1-30L/min flow range, operating at DC 5-24V and up to 1.75Mpa pressure. Made from food-grade, ROHS-compliant plastic, it ensures safe, leak-proof fluid measurement. Perfect for professional-grade water heaters, coffee machines, and smart beverage systems, it comes as a convenient pack of two for enhanced value and reliability.

## 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

Review: Seems to have a decent variance when it’s not a lot of fluid going through
Review: The price was good and seemed to work as described but have not run calibration tests yet. I was able to find online programming and application information but it would have been nice to provide links to technical data sheets and programming examples.

## 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 |
| ASIN  | B07RG4KXWJ |
| Batteries Included? | No |
| Batteries Required? | No |
| Customer Reviews | 4.0 4.0 out of 5 stars (19) |
| Customer reviews | 4.0 4.0 out of 5 stars (19) |
| Date First Available | 26 December 2024 |
| Date First Available  | 26 December 2024 |
| Item Weight | 100 g |
| Item model number | GR-201P2 |
| Item model number  | GR-201P2 |
| Manufacturer | GREDIA |
| Manufacturer  | GREDIA |
| Material | Plastic |
| Package Dimensions | 18.11 x 11.71 x 3.51 cm; 100 g |
| Package Dimensions  | 18.11 x 11.71 x 3.51 cm; 100 g |
| Part number | GR-201P2 |
| Size | G1/2" male thread 2 |
| Style | G1/2" male thread |

## 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)
![1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） - Image 2](https://m.media-amazon.com/images/I/61pUNNCWDAL.jpg)
![1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） - Image 3](https://m.media-amazon.com/images/I/61D8ujyEenL.jpg)
![1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） - Image 4](https://m.media-amazon.com/images/I/61fM7z5z0YL.jpg)
![1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min (Pack of 2） - Image 5](https://m.media-amazon.com/images/I/5142HDOWNBL.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.

## Customer Reviews

### ⭐⭐⭐ Review
*by L***I on 23 July 2025*

Seems to have a decent variance when it’s not a lot of fluid going through

### ⭐⭐⭐⭐ Review
*by B***E on 8 June 2025*

The price was good and seemed to work as described but have not run calibration tests yet. I was able to find online programming and application information but it would have been nice to provide links to technical data sheets and programming examples.

### ⭐⭐⭐⭐⭐ Review
*by R***R on 15 July 2021*

First you need to know that the output is NPN (sinking). That means that it gives you negative pulses. Works well with a Click PLC using a high speed counter input. I can't vouch for the accuracy because I just needed to detect flow. It does detect pretty low flow. The threads sealed well to NPT to PEX brass fittings with plenty of thread tape. It's cheep and does the job.

## Frequently Bought Together

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-03*