---
product_id: 107557535
title: "1/2\" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min"
brand: "gredia"
price: "R339"
currency: ZAR
in_stock: true
reviews_count: 11
category: "Gredia"
url: https://www.desertcart.co.za/products/107557535-1-2-water-flow-sensor-food-grade-switch-hall-effect
store_origin: ZA
region: South Africa
---

# Food-grade, leak-proof design DC 5-24V wide voltage support 1-30L/min flow range 1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min

**Brand:** gredia
**Price:** R339
**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 by gredia
- **How much does it cost?** R339 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/107557535-1-2-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

- • **Wide Voltage Range:** Operates seamlessly from 5V to 24V DC, perfect for diverse setups
- • **Leak-Proof Reliability:** Sealing ring ensures firm connection, eliminating water leakage worries
- • **Precision Flow Control:** Accurate ±2% measurement for flawless fluid management
- • **Robust & Safe Materials:** Crafted from food-grade plastic, ROHS certified for peace of mind
- • **Universal Compatibility:** Fits G1/2 inch BSPT threads—easy integration with your devices

## Overview

The GREDIA 1/2" Water Flow Sensor is a compact, food-grade hall effect flowmeter designed for precise fluid measurement between 1-30L/min. It supports a broad DC voltage range (5-24V), withstands water pressure up to 1.75Mpa, and features a leak-proof sealing ring for reliable, easy installation in water heaters, coffee machines, purifiers, and more.

## 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: 1 x G1/2 inch flowmeter

Review: Works great on my laser cutter - Great replacement for the flow sensor on my Red China laser.
Review: Easy to set up and use - Works well was easy to setup. Using with an arduino uno that has an lcd display to measure total volume and rate of a variable rate spraying system. Read the description. Make sure that the sensor will work for the volume per minute you need measure.

## Features

- Connect to G1/2 inch BSPT male thread, hall effect
- 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 | B07MY745M4 |
| Best Sellers Rank | #29,437 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #9 in Flowmeters |
| Date First Available | January 19, 2019 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.41 ounces |
| Item model number | GR-201 |
| Manufacturer | GREDIA |
| Package Dimensions | 3.31 x 2.99 x 1.61 inches |

## Images

![1/2" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-30L/min - Image 1](https://m.media-amazon.com/images/I/61pUNNCWDAL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great on my laser cutter
*by S***T on December 12, 2025*

Great replacement for the flow sensor on my Red China laser.

### ⭐⭐⭐⭐⭐ Easy to set up and use
*by C***S on November 14, 2025*

Works well was easy to setup. Using with an arduino uno that has an lcd display to measure total volume and rate of a variable rate spraying system. Read the description. Make sure that the sensor will work for the volume per minute you need measure.

### ⭐⭐⭐⭐ Not perfect but for the price i have no complaints
*by A***R on December 30, 2023*

title sums it up for me, i added enough Teflon tape, screwed everything together (no leaks) and started coding. for this project i used 2 GREDIA G2 2" Water Flow Sensor/Switch Hall Effect Flowmeter Fluid Meter Counter 10-200L/min (model GR-216). my pump is rated for about 80gpm accounting for 90degree elbows and piping i was suspecting about 60gpm all said and done. After physically measuring my flow rate and modifying my initial code i ended with a flow rate of about 57.75gpm so these get a thumps up from me. here is my initial starting off point with my Rpi3/python code wise, feel free to use it (i monster-iz-ed a couple code snip-its i found online) only thing i don't 100% understand is at the very end of the code i have to multiple gpm by 2 to get close to what i physically measured. only logic i can use is maybe this/these sensors have two pulses per rotation other than that i have no idea, it's avg. rate is at about what i measured (+-1.6%) so it's good enough for what i'm using them for. ## This if for 2 GREDIA G2 2" Water Flow Sensor/Switch Hall Effect Flowmeter Fluid Meter Counter 10-200L/min (model GR-216) ## This code is not 100% accurate but is close enough for measuring coolant flow in a cooling system ## physically measure a flow rate of about 6.44531 gpm; sensor avg. rate is 6.342 gpm a difference of about 1.6% #!/usr/bin/python3 import RPi.GPIO as GPIO import time, sys FLOW_SENSOR = 4 FLOW_SENSOR2 = 17 flowCalibrationFactor = 0.2 # Note: F=(0.2*Q)±2% for this flow sensor, Q=L/Min, and F is pulse freq in 1/s global oldTime global count global count2 oldTime = 0 count = 0 count2 = 0 GPIO.setmode(GPIO.BCM) GPIO.setup(FLOW_SENSOR, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) GPIO.setup(FLOW_SENSOR2, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) def main(): GPIO.add_event_detect(FLOW_SENSOR, GPIO.RISING, callback=countPulse) GPIO.add_event_detect(FLOW_SENSOR2, GPIO.RISING, callback=countPulse2) while True: try: curgpm = getFlow() print("GPM: %s" % curgpm ) time.sleep(1) except KeyboardInterrupt: print('\ncaught keyboard interrupt!, bye') GPIO.cleanup() sys.exit() def countPulse(channel): global count count = count+1 def countPulse2(channel): global count2 count2 = count2+1 def getFlow(): global count global count2 global oldTime start_cnt = count + count2 readcnt = 0 while readcnt < 1000: time.sleep(0.001) readcnt += 1 end_cnt = count + count2 pulses = end_cnt - start_cnt # Note: F=(0.2*Q)±2% for this flow sensor, Q=L/Min, and F is pulse freq in 1/s gpm = ((1000.0 / (round(time.time() * 1000, 5) - oldTime)) * pulses) / flowCalibrationFactor*0.26417287472922 #gph = ((1000.0 / (round(time.time() * 1000, 5) - oldTime)) * pulses) / flowCalibrationFactor*15.8503 pulses = 0 oldTime = round(time.time() * 1000, 5) return round(gpm, 3)*2 if __name__ == "__main__": main()

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-23*