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1/4" Water Flow Sensor Food-Grade Switch Hall Effect Flowmeter Fluid Meter Counter Connect Hosepipe 0.3-6L/min

4.3 out of 5 stars 119 ratings
$9.29
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Size: G1/4" hosepipe
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Purchase options and add-ons

  • Connect to a hosepipe whose inner diameter is about 5 to 7 mm( G1/4 inch connector)
  • Flow range: 0.5-3L/min, Water Pressure: ≤0.8Mpa
  • Working voltage: DC 5-24 V, F=(98*Q)±3%, 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.
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Package Dimensions ‏ : ‎ 4.95 x 3.5 x 0.3 inches; 0.81 ounces
  • Item model number ‏ : ‎ GR-R401
  • Date First Available ‏ : ‎ January 19, 2019
  • Manufacturer ‏ : ‎ GREDIA
  • ASIN ‏ : ‎ B07MY6XJKK
  • Customer Reviews:
    4.3 out of 5 stars 119 ratings

Product 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=(98*Q)±3%, Q=L/Min, error: ±3%
Working range: 0.5-3L/min
Working voltage: DC 5-24 V
Water Pressure: ≤0.8Mpa
Liquid temperature: 0-100℃
Maximum current consumptiont: 10 mA(DC 5V)
Size: 58mm x 34mm x 26mm(L*W*H)
Wire length: 15 cm
Refer to the wiring:
 Red wire: VCC(+)
Black wire: GND(-)
Yellow wire: Signal output

Package:
 1 x G1/4 inch flowmeter connect hosepipe

Customer reviews

4.3 out of 5 stars
119 global ratings

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Cheap add-in for PC Water Cooling loop
5 out of 5 stars
Cheap add-in for PC Water Cooling loop
Replaced the connecter with a 3-pin 12V RPM PC connector. Setup a small external loop for testing. Flow should roughly be 25% - 30% of RPM value. This is based on the Alphacool DC LT 2600 that is being used has a max flow of 100 LPH.
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Top reviews from the United States

  • Tod Wulff
    5.0 out of 5 stars Works as expected
    Reviewed in the United States on April 21, 2022
    Size: G1/4" hosepipe 2Verified Purchase
    As info, I ordered/received the 2pc Gredia GR-R401 G1/4 Hose Pipe flavor. I got 2 so I could disassemble one and have the other unfettered in case I destroyed the one I was frackin with. I am using this on a water cooled 3d printer hot end, to give Klipper programmatic flow indication. These are 3 full pulses per revolution (6 edges). As another user reviewed, there is a reduction of the ID on the inlet side of the flow meter. I presume this was so that there was a focus of pressure on the rotor blades. It is 1.5mm in diameter (checked with a 1.5mm shaft). At ~35 deg C coolant temp, I am getting ~900-1000 PPM (~333 rpm @ 3 PPR). As the fluid warms, it becomes more viscous and flow increases. I am happy with the product. I opened the orifice on the 2nd unit to 2mm and will test to see if I get comparable usability with the larger orifice, and see if I get overall better flow/performance from the cooling system.
    4 people found this helpful
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  • Konstantinos Lamprakis
    5.0 out of 5 stars All looks good
    Reviewed in the United States on November 24, 2024
    Size: G1/4" male thread 2Verified Purchase
    I have tried these with my watercooling kit and they seem to play along just fine with the fittings. They seem compatible (after re-wiring the plug) with computer fans (electrically at least).
    Output (in Hz) appears to be "Liters/minute=Hz/200" (i.e. if you measure 1,4KHz it means that you have 7Lt/min flow) as measured with my oscilloscope and cheap flow meter.
    2 people found this helpful
    Helpful
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  • stlscott
    4.0 out of 5 stars Sourcing PLC Input to Read Pulses
    Reviewed in the United States on December 4, 2021
    Size: G1/4" male thread 2Verified Purchase
    I ordered this to test measuring low flows from chemical dosing pumps. The sensor must be an NPN (sinking) transistor, as it would only work when wired to a sourcing PLC input on my Micro 850 PLC.
    5 people found this helpful
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  • Bill May
    5.0 out of 5 stars Works as expected.
    Reviewed in the United States on August 30, 2024
    Size: G1/4" qiuck connectVerified Purchase
    I use it to sense the water flow of my RO system and trigger the UV light to sanitize the water. It worked as expected no complains.
    2 people found this helpful
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  • Ben
    5.0 out of 5 stars Cheap add-in for PC Water Cooling loop
    Reviewed in the United States on January 10, 2023
    Size: G1/4" male threadVerified Purchase
    Replaced the connecter with a 3-pin 12V RPM PC connector. Setup a small external loop for testing. Flow should roughly be 25% - 30% of RPM value.
    This is based on the Alphacool DC LT 2600 that is being used has a max flow of 100 LPH.
    Customer image
    Ben
    5.0 out of 5 stars
    Cheap add-in for PC Water Cooling loop

    Reviewed in the United States on January 10, 2023
    Replaced the connecter with a 3-pin 12V RPM PC connector. Setup a small external loop for testing. Flow should roughly be 25% - 30% of RPM value.
    This is based on the Alphacool DC LT 2600 that is being used has a max flow of 100 LPH.
    Images in this review
    Customer imageCustomer imageCustomer imageCustomer image
    One person found this helpful
    Helpful
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  • Michael E.
    2.0 out of 5 stars Unreliable
    Reviewed in the United States on January 6, 2024
    Size: G3/8" qiuck connect 2Verified Purchase
    I would not use this for anything where you need a reliable measurement. Initially worked great (with filtered water) but within 2 months it measured much lower flow rate than the actual flow. Seems the turbine doesn't always spin fast enough, allowing water to pass over it without being counted.
    Helpful
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  • D Clark
    5.0 out of 5 stars Fast shipping
    Reviewed in the United States on November 14, 2022
    Size: G1/4" hosepipeVerified Purchase
    It arrived very promptly but after doing some testing it turns out that I didn’t need the switch. A small amount of debris was plugging the circulation tubes on my Laser Cutter so I ran water backwards through the system flushed it out and now everything works as it should.
    Helpful
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  • Denny
    4.0 out of 5 stars That you have to use a hard plastic tubing like Pex
    Reviewed in the United States on October 29, 2020
    Size: G3/8" qiuck connectVerified PurchaseEarly Reviewer Rewards(What's this?)
    That 3/8 " is the od of the tubing used not the ID
    6 people found this helpful
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Top reviews from other countries

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  • Daniel Yang
    1.0 out of 5 stars Flowmeter design does not work
    Reviewed in Canada on August 22, 2023
    Size: G1/4" qiuck connect 2pcsVerified Purchase
    The rotary blades used within this hall effect flowmeter are tapered such that they have a variable width. Because of this, water can easily pass through gaps between these blades and the flowmeter casing which basically renders flow data as garbage. Digiten also utilizes this completely useless design. Do not buy from either of these companies
    Report
  • ancodia
    5.0 out of 5 stars Works great.
    Reviewed in Canada on January 18, 2021
    Size: G1/4" qiuck connectVerified Purchase
    I use it to track usage/flow rates for my RO unit. . Connected to a ESP8266 & works fine with 3.3v supply .. simply connect it directly to a GPIO pin. Programmed the ESP8266 using ESPhome & use InfuxDB to store the data, Grafana to display. For example, to measure L/hr configure ESPhome as follows:

    - platform: pulse_counter
    pin: GPIO5
    name: "Pulse Counter"
    update_interval: 60s
    filters:
    - lambda: return (x / 38.0) * 60.0;
    unit_of_measurement: "L/hr"
    Report
  • Tanis
    2.0 out of 5 stars Sensor de flujo de agua
    Reviewed in Mexico on November 21, 2024
    Size: G1/4" qiuck connectVerified Purchase
    No envia ninguna senal de salida
    Report
  • Sean
    4.0 out of 5 stars works well as a means of metering my custom cooling loop
    Reviewed in Canada on February 17, 2021
    Size: G1/4" male threadVerified Purchase
    With a little Teflon plumbers tape, this fits no problem with the standard G1/4 fittings used in most custom water cooling loops, and plugs right into a standard fan header to meter flow. A cheap and efficient means of ensuring that the water isn't obstructed in any way. For the record, water flow rate has negligible impact on overall cooling - just so long as there is flow. As such, I use this to set an alarm a,d shut down the computer - should the flow ever stop. cheap insurance.
    Report