---
product_id: 118925667
title: "3/4\" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min"
brand: "gredia"
price: "₱2000"
currency: PHP
in_stock: true
reviews_count: 13
category: "Gredia"
url: https://www.desertcart.ph/products/118925667-3-4-water-flow-sensor-food-grade-switch-hall-effect
store_origin: PH
region: Philippines
---

# DC 5-24V wide voltage 1-60L/min flow range G3/4 inch male thread fit 3/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min

**Brand:** gredia
**Price:** ₱2000
**Availability:** ✅ In Stock

## Summary

> 💧 Flow with confidence, measure with precision!

## Quick Answers

- **What is this?** 3/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min by gredia
- **How much does it cost?** ₱2000 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/118925667-3-4-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

- • **Food-Grade Safety:** Crafted from ROHS-certified, food-safe plastic for pure, contaminant-free flow
- • **Leak-Proof Design:** Enhanced sealing ring ensures zero water leakage, protecting your setup
- • **Precision Flow Control:** Accurate ±2% measurement for flawless fluid management
- • **Universal Compatibility:** Seamlessly connects with G3/4 inch fittings—perfect for coffee machines to water purifiers
- • **Energy Efficient & Compact:** Low 15mA current draw with a sleek 66x38mm footprint fits any professional workspace

## Overview

This 3/4" Water Flow Sensor features a hall effect switch with a broad 1-60L/min range, operating safely under 1.2Mpa pressure and 0-100℃ temperature. Made from food-grade, ROHS-compliant plastic, it guarantees hygienic use in water heaters, coffee machines, and purifiers. Its compact design, leak-proof sealing, and wide 5-24V voltage compatibility make it a reliable, energy-efficient choice for precise fluid monitoring in professional and smart applications.

## 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=(5.5*Q)±2%, Q=L/Min, error: ±2% Working range: 1-60L/min Working voltage: DC 5-24 V Water Pressure: ≤1.2Mpa Liquid temperature: 0-100℃ Maximum current consumption: 15 mA(DC 5V) Wire length: 15 cm Size: 66mm x 38mm(L*W) Refer to the wiring: Red wire: VCC(+) Black wire: GND(-) Yellow wire: Signal output Package: 1 x G3/4 inch flowmeter

Review: Using with a reef aquarium to control flow thru a UV sterilizer - I've adapted this Gredia GR-201 1/2" flow sensor paired with a Digiten Flow Meter to monitor flow rate thru a UV sterilizer. The sterilizer I have requires a flow at 37 GPH optimum and 60 GPH max to be effective eradicating protozoa. Out of the box the pairing of the meter and sensor was way off reporting 16 GPH while a had a gate valve nearly closed. So to calibrate it, the meter has a K-factor value that has to be adjusted to the sensor you pair it with. The default was a K-factor value of 1.98. I did a Google Bard search for what the sensors K-factor should be... 11.45. I set the meters K-factor to that. It was much closer but not accurate. I adjusted my valve until the meter was reading 1 GPH of flow. I set up a bucket to divert the water exiting the system into so I could measure the amount dispensed in a minute. I recorded .453 gal. with the K- 11.45. Now a little math, divide the current K- (11.45) by the flow it produced (0.453) while the valve restricted flow with the meter reading 1 GPM. The resulting new K-factor of 25.27 worked precisely. Well, as precise as using a large measuring cup to measure the amount of water dispensed. I re-ran the test, I got 1 gallon at the 1 minute mark, 3 gal at 3 minutes. The one annoying thing about the meter is the backlit display goes dark after 15 seconds. Annoying during the calibration when your hands are busy turning on/off a pump and a timer. But in actual use I'll only be using this to set the gate valve position and the backlighting won't so much be an issue. I hope this helps those trying to get a more accurate reading.
Review: The magic number is 897 pulses per gallon - Works. Definitely seeing the +/- 5% difference in output. A few things I discovered: * The sensor needs at least 8V. I had a 9v power supply left over from some other equipment. However, a raspberry PI can only take 3.3V into its GPIO port. (and no pull-up resistor is needed) So I sent 8V into this sensor, and on the output pin I installed a 10k resistor tied to ground. This dropped the output voltage to around 3.7V. * I wanted to record data in gallons per hour. This is from my most recent calibration where I dumped water into a bucket marked off with quarters of a gallon on the side. total_gal = total_gal + 0.001115 # 897 pulses per gal = 0.001115 gal per pulse. This code runs whenever a change from high to low occurs on the output pin. flow = (count / 897.0)*3600 # pulses/897 is gal per sec. *3600 is gal per hour * the label faces down. There is a lot of play in the spindle inside. making the label face down puts the impeller more directly in line with the water flow * make sure you install it in the right direction. The arrow on the label was correct for me. * I used waterproof automotive plugs, sealed on the ends with caulk, since this thing will be outside measuring the irrigation water usage.

## Features

- Connect to G3/4 inch male thread, hall effect
- Flow range:1-60L/min, Water Pressure: ≤1.2Mpa
- Working voltage: DC 5-24 V, F=(5.5*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 |
|---------------|-------|
| Customer Reviews | 4.3 out of 5 stars 195 Reviews |

## Images

![3/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min - Image 1](https://m.media-amazon.com/images/I/6119f+Cq5cL.jpg)
![3/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min - Image 2](https://m.media-amazon.com/images/I/61mXD2gAagL.jpg)
![3/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min - Image 3](https://m.media-amazon.com/images/I/61rUr0C0tSL.jpg)
![3/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter 1-60L/min - Image 4](https://m.media-amazon.com/images/I/71aE43DGRuL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Using with a reef aquarium to control flow thru a UV sterilizer
*by B***. on June 26, 2023*

I've adapted this Gredia GR-201 1/2" flow sensor paired with a Digiten Flow Meter to monitor flow rate thru a UV sterilizer. The sterilizer I have requires a flow at 37 GPH optimum and 60 GPH max to be effective eradicating protozoa. Out of the box the pairing of the meter and sensor was way off reporting 16 GPH while a had a gate valve nearly closed. So to calibrate it, the meter has a K-factor value that has to be adjusted to the sensor you pair it with. The default was a K-factor value of 1.98. I did a Google Bard search for what the sensors K-factor should be... 11.45. I set the meters K-factor to that. It was much closer but not accurate. I adjusted my valve until the meter was reading 1 GPH of flow. I set up a bucket to divert the water exiting the system into so I could measure the amount dispensed in a minute. I recorded .453 gal. with the K- 11.45. Now a little math, divide the current K- (11.45) by the flow it produced (0.453) while the valve restricted flow with the meter reading 1 GPM. The resulting new K-factor of 25.27 worked precisely. Well, as precise as using a large measuring cup to measure the amount of water dispensed. I re-ran the test, I got 1 gallon at the 1 minute mark, 3 gal at 3 minutes. The one annoying thing about the meter is the backlit display goes dark after 15 seconds. Annoying during the calibration when your hands are busy turning on/off a pump and a timer. But in actual use I'll only be using this to set the gate valve position and the backlighting won't so much be an issue. I hope this helps those trying to get a more accurate reading.

### ⭐⭐⭐⭐⭐ The magic number is 897 pulses per gallon
*by H***R on August 29, 2024*

Works. Definitely seeing the +/- 5% difference in output. A few things I discovered: * The sensor needs at least 8V. I had a 9v power supply left over from some other equipment. However, a raspberry PI can only take 3.3V into its GPIO port. (and no pull-up resistor is needed) So I sent 8V into this sensor, and on the output pin I installed a 10k resistor tied to ground. This dropped the output voltage to around 3.7V. * I wanted to record data in gallons per hour. This is from my most recent calibration where I dumped water into a bucket marked off with quarters of a gallon on the side. total_gal = total_gal + 0.001115 # 897 pulses per gal = 0.001115 gal per pulse. This code runs whenever a change from high to low occurs on the output pin. flow = (count / 897.0)*3600 # pulses/897 is gal per sec. *3600 is gal per hour * the label faces down. There is a lot of play in the spindle inside. making the label face down puts the impeller more directly in line with the water flow * make sure you install it in the right direction. The arrow on the label was correct for me. * I used waterproof automotive plugs, sealed on the ends with caulk, since this thing will be outside measuring the irrigation water usage.

### ⭐⭐⭐⭐ 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 Philippines*
*Store origin: PH*
*Last updated: 2026-05-08*