Best Flow Sensors of 2025

Brian Howie Avatar
Brian Howie
Last Updated: Jan 8, 2025

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Flow sensors are devices that measure the flow rate or volume of a fluid, typically a liquid or gas, passing through a system. They are commonly used in a wide range of industries, including automotive, medical, manufacturing, and HVAC, to monitor and control fluid flow. Flow sensors can be either contact or non-contact devices, with the former requiring physical contact with the fluid and the latter using ultrasonic or other non-invasive methods to measure flow. They come in a variety of sizes and designs, from compact and low-cost options to high-precision models for use in critical applications. Overall, flow sensors play a crucial role in ensuring efficient and safe operation of fluid systems across industries.

At a Glance: Our Top Picks

HiLetgo Water Flow Sensor Cover #TOP 1
HiLetgo Water Flow Sensor
ftb score rating icon 9.8
uxcell Water Flow Sensor SEN-CL08C Cover #TOP 2
uxcell Water Flow Sensor SEN-CL08C
ftb score rating icon 9.7
Ecosmart Fsa Nfsml Flow Sensor Cover #TOP 3
Ecosmart Fsa Nfsml Flow Sensor
ftb score rating icon 9.5

Top 10 Flow Sensors

#TOP 1

HiLetgo Water Flow Sensor

3-01-1257
HiLetgo Water Flow Sensor Cover
HiLetgo G1/2" Water Flow Hall Sensor Switch 1-30L/min 1.75MPa Flow Meter Flowmeter Counter Water Flow Sensor

The HiLetgo G1/2" Water Flow Hall Sensor Switch 1-30L/min 1.75MPa Flow Meter Flowmeter Counter Water Flow Sensor, also known as the HiLetgo Flow Sensor, is a versatile and efficient device for measuring water flow. With a working voltage range of DC 5~18V and a load capacity of 10mA, this flow sensor is suitable for a wide range of applications. Its 1-30L/min flow rate and 1.75MPa maximum operating pressure make it ideal for monitoring water flow in various settings. Whether you need to measure water flow in industrial processes or home applications, the HiLetgo Flow Sensor provides accurate and reliable readings. Its hall effect technology ensures precise measurements, while its compact size and easy installation offer convenience and flexibility. With the HiLetgo Flow Sensor, you can easily monitor and control water flow, ensuring efficient usage and preventing waste.

What We Like
Versatile
Precise Measurements
Compact and Easy to Install
#TOP 2

uxcell Water Flow Sensor SEN-CL08C

a18041200ux0147
1.2-12L/min 8mm
uxcell Water Flow Sensor SEN-CL08C Cover
uxcell 8mm Hall Effect Liquid Water Flow Sensor Switch Flow Counter Meter 1.2-12L/min SEN-CL08C

uxcell Water Flow Sensor SEN-CL08C is a compact sensor with high stability, suitable for low water pressure starts. Made of durable brass material, it features an imported Hall element for waterproofing. The impeller has a stainless steel shaft, ensuring longevity. This sensor is ideal for water heaters, doubling as a flow switch. Plus, all components meet SGS testing standards, ensuring safety. With a flow range of 1.2-12L/min and a max water pressure of 1.75 Mpa, the uxcell Flow Sensor SEN-CL08C is a reliable choice for monitoring water flow.

What We Like
Stable and durable
Waterproof design
Meets SGS standards
#TOP 3

Ecosmart Fsa Nfsml Flow Sensor

FSA NFSML
Ecosmart Fsa Nfsml Flow Sensor Cover
Ecosmart Fsa Nfsml Flow Sensor

The Ecosmart Flow Sensor is a replacement part for tankless electric water heaters. It is compatible with the ECO 8 and ECO 11 models. This flow sensor assembly is designed to measure the flow of water and ensure optimal performance of your water heater. With this flow sensor, you can easily monitor the water flow rate and make adjustments as needed. This can help you save energy and reduce water waste. The Ecosmart Flow Sensor is a convenient and reliable solution for maintaining the efficiency of your tankless electric water heater.

What We Like
Compatible with ECO 8 and ECO 11
Measures water flow rate
Helps save energy
#TOP 4

DIGITEN G1/2" Water Flow Sensor

CF-B4
DIGITEN G1/2" Water Flow Sensor Cover
Digiten G1/2"Thread Water Flow Hall Sensor Switch Flowmeter Counter with Temperature Sensor Female and Male Thread 1-25L/min

The DIGITEN Flow Sensor is designed for durability and ease of use. Its waterproof and heat-resistant features ensure it can withstand various environmental conditions, providing reliable performance. Being compact, it is simple to install, making it a convenient choice for users. Additionally, the built-in temperature sensor allows you to monitor water temperature alongside flow measurement, offering a comprehensive solution for fluid management. This flow meter is versatile and can be utilized in numerous applications, ensuring you can accurately measure fluid flow in pipes.

What We Like
Waterproof and heat-resistant
Easy installation
Temperature measurement capability
Compact design
#TOP 5

Ecosmart Flow Sensor

FSA NFPOU
Ecosmart Flow Sensor Cover
Ecosmart FSA NFPOU Flow Sensor

Ecosmart Sensor is a flow sensor assembly designed for Eco Pou 3.5 & Eco Pou 6 models. You can easily connect it to your Eco Pou systems. If you have any questions, feel free to contact Eco Smart. This product, from the brand Ecosmart, ensures efficient water flow monitoring, making it convenient for users to track water usage and optimize their Eco Pou systems.

What We Like
Efficient water flow monitoring
Easy connection to Eco Pou systems
Convenient for tracking water usage
#TOP 6

DIGITEN G3/8" Water Flow Sensor

FL-308ZJ
G3/8" Quick Connect
DIGITEN G3/8" Water Flow Sensor Cover
DIGITEN G3/8" Quick Connect Hall Effect Sensor Water Flow Sensor Food-Grade Flowmeter Water Flow Counter Meter 0.3-10L/min - Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible

The DIGITEN Water Flow Sensor is designed with food safety in mind, ensuring that any liquid passing through it is safe to drink. Its G3/8 inch Quick-Connect feature allows for easy installation and removal, making it compatible with most Reverse Osmosis filtration systems. With a flow range of 0.3-10L/min and a working voltage of DC 5-18V, it provides flexibility for various applications. Additionally, this sensor is built to withstand different environmental conditions, including water, heat, and pressure, making it reliable for use in water heaters, purifiers, and other devices.

What We Like
Food-grade safety
Easy installation
Wide flow range
Durable and resistant
#TOP 7

DIGITEN FL-408NPT Water Flow Sensor

FL-408NPT
Black
NPT Thread
DIGITEN FL-408NPT Water Flow Sensor Cover
DIGITEN FL-408NPT Water Flow Sensor G1/2" Flow Meter NPT Thread Hall Water Flow Sensor Switch 1.75 Mpa Below, 1-30L/min

DIGITEN Flow Sensor is a compact, easy-to-install water flow sensor that utilizes bearings for rotation. The sensor is designed with a sealing ring and ROHS compliant food-grade materials, ensuring water-proof, leak-proof, pressure-resistance, heat-resistance, and cold-resistance. Its integrated magnetic Hall effect sensor is sealed from the water pipe, providing safety and dryness while outputting electrical pulses with each rotation. This versatile sensor is ideal for various applications like water heaters, drinking water machines, coffee makers, water flow control, waterworks, and irrigation systems.

What We Like
Compact Design
ROHS Compliant
Wide Application Range
#TOP 8

uxcell Water Flow Sensor SEN-CL21W

a18041200ux0131
Brass
uxcell Water Flow Sensor SEN-CL21W Cover
uxcell G1/2" Hall Effect Liquid Water Flow Sensor Switch Flowmeter Counter Meter 1-30L/min SEN-CL21W

uxcell Flow Sensor SEN-CL21W is a reliable water flow sensor perfect for water heaters. Its stable performance ensures high-temperature operation and easy start even with low water pressure. Made of durable brass material with a waterproof design, it prevents water ingress. The impeller inside features a stainless steel shaft, ensuring wear-resistance. This sensor can be used as a flow switch, meeting SGS testing standards. With a flow range of 1-30L/Min and a maximum water pressure of 1.75MPa, it offers efficient water flow monitoring for various applications.

What We Like
Stable performance
Durable brass material
Waterproof design
#TOP 9

DIGITEN G1 Flow Sensor

CF-B10
DIGITEN G1 Flow Sensor Cover
Digiten G1" Male Thread Water Flow Hall Sensor Switch Flowmeter Counter 2-50L/min

The DIGITEN G1 Flowmeter is a compact and efficient tool designed for measuring fluid flow in pipes. Its waterproof and heat-resistant design ensures durability, making it suitable for various environments. You will appreciate how easy it is to install, saving you time and effort. This flow sensor works seamlessly with Android and Raspberry Pi systems, allowing you to integrate it into your projects effortlessly. Plus, it meets ROHS testing standards, ensuring safety and environmental compliance for your peace of mind.

What We Like
Durable and waterproof
Easy installation
Compatible with Android and Pi
Compact size
#TOP 10

DIGITEN G3/4" Water Flow Sensor

FL608-1
DIGITEN G3/4" Water Flow Sensor Cover
DIGITEN G3/4" Water Flow Hall Sensor Switch Flow Meter Flowmeter Counter 1-60L/min with 1.2m Wire

The DIGITEN Water Flow Sensor is designed for easy installation and convenience. Its lightweight and compact design allows you to set it up without hassle. With an integrated magnetic hall effect sensor, you receive an electrical pulse with each rotation, providing accurate flow measurements. This sensor is also well-protected from water, ensuring it remains dry and functional. Operating within a voltage range of DC 3-24 V, it adapts to various systems effortlessly. Overall, this sensor enhances your monitoring capabilities, making it a reliable choice for flow measurement.

What We Like
Easy installation
Accurate flow measurement
Waterproof design
Wide voltage range
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What are flow sensors used for?

Flow sensors are devices used for measuring the flow rate or quantity of a moving liquid or gas (22). New materials have been introduced into flow sensors to improve their performance.

2. How do fluid flow sensors work?

These mechanical water flow meters work by measuring the speed of flowing water running through the pipe that causes a turbine or piston to rotate. The volumetric flow rate of the water is proportional to the rotational speed of the blades.

3. How many types of flow sensors is available?

The different types of flow sensors generally fall into one of three categories: Positive displacement flow sensors. Mass flow sensors. Velocity flow sensors.

4. What is the function of flow sensor in ventilator?

Expiratory flow sensor used on intensive care ventilators to measure a patient's exhaled gas flow from the expiratory limb. Data is then used to calculate exhaled tidal and minute volumes.

Editor's Notes

During our flow sensor research, we found 24 flow sensor products and shortlisted 10 quality products. We collected and analyzed 4,609 customer reviews through our big data system to write the flow sensors list. We found that most customers choose flow sensors with an average price of $16.89.

The flow sensors are available for purchase. We have researched hundreds of brands and picked the top brands of flow sensors, including HiLetgo, uxcell, EcoSmart, DIGITEN. The seller of top 1 product has received honest feedback from 863 consumers with an average rating of 4.8.

Written by
Brian Howie Avatar

Brian Howie is a content writer and senior industrial designer. After graduation from Westminster College, he has been engaged in product design and manufacturing for 18 years. Brian Howie has always found great pleasure in designing industrial products and sharing his ideas and experience online.