FS400A Water Flow Sensor


In stock

SKU: 890243
  1. Good Quality Water Flow Sensor
  2. Operating Voltage: 12VDC
  3. Flow Range: 1-60L/Min
  4. Input/ Output Thread dimeter: 1 inch (24.5 inch)
  5. Suitable for Water Pressure Below 1.75MPa


(Including GST)

In stock

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Brand: Generic
Category: Water TDS, pH, Flow, Level and Pressure Sensor

The water flow sensor is mainly composed of a plastic valve body, a water flow rotor assembly, and a Hall sensor. It is installed on the water inlet end of the water heater to detect the water flow rate. When the water passes through the water flow rotor assembly, the magnetic rotor rotates and the speed changes with the flow rate. The Hall sensor outputs the corresponding pulse signal and feeds it back to the controller. The device judges the size of the water flow and regulates it.

Precautions for Use:
  1. Severe impact and chemical erosion are strictly prohibited.
  2. Throwing or collision is strictly prohibited.
  3. The temperature of the medium should not exceed 120 degrees
  4. If the water quality is too bad, please add a filter at the water inlet.
  5. Do not use beyond the flow range


  1. This Sensor is Light and Handy in Appearance, Small in Size, and Easy to Install.
  2. The Impeller Rotates Around the Entire Stainless Steel Bearing, and the Stainless Steel Ball is Embedded to Improve the Rotational Sensitivity.
  3. The Sealing Ring Adopts an Upper and Lower Force Structure and will Never be Affected by Thermal Expansion and Contraction.
  4. The Hall Element is Imported, and Designed to be Isolated From Water, Epoxy Resin Encapsulated, Anti-Oxidation.
  5. All Raw Materials are in Compliance with ROHS Testing Standards
  6. Porous Design and Small Flow Can be Sensed as Usual.

Package Includes:

1 x FS400A Water Flow Sensor



Operating Voltage (VDC)


Operating Temperature (°C)

0 to 80

Operating Humidity (%RH)

35 to 90

Input/Output thread

1 inch (24.50 mm)

Maximum Operating Pressure

1.75 MPa

Output Format

Digital Pulses

Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.033 kg
Shipping Dimensions 8 × 5 × 3 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects. Replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.


Questions and answers of the customers

  1. 0 votes
    Q how many pulses/liter? answer now
    Asked by nmdali on January 10, 2024 5:36 am

    the FS400A Water Flow Sensor produces 450 outpu... Read more

  2. 0 votes
    Q what is the frequency per liter answer now
    Asked by abhimanyuprasad on September 19, 2021 5:23 pm

    Flow Range: 1-60L/Min

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Country Of Origin: China