FS400A Hall Water Flow Sensor 1" Nylon Pulse Meter 2-60L/min
FS400A Hall Water Flow Sensor 1" Nylon Pulse Meter 2-60L/min
FS400A Hall Effect Water Flow Sensor – High-Precision Pulse Flow Meter for Large Pipelines
Meet the FS400A Hall Water Flow Sensor — a rugged, high-precision nylon flow meter designed for large-pipeline applications. Whether you're building an automated irrigation system, a DIY water-monitoring station, or an industrial fluid-control circuit, this sensor delivers reliable, real-time flow data with a wide operating voltage range of DC 3.5 V – 24 V and a flow range of 2–60 L/min (±5%).
Using a Hall-effect turbine mechanism, the sensor outputs clean digital pulses (Hz = 6×Q − 2, equating to approximately 358 pulses per liter) that any microcontroller — Arduino, Raspberry Pi, PLC, or custom circuit — can read and convert into accurate volumetric flow data.
Made in Mainland China.
Key Features
- Wide Voltage Compatibility: Operates at DC 3.5 V to 24 V — works with virtually any microcontroller or control board.
- High Flow Range: Accurately measures 2–60 L/min (±5%) — ideal for large-bore pipeline installations.
- High Pressure Rating: Withstands up to 1.75 MPa, suitable for demanding water systems.
- Durable Nylon Body: Lightweight yet robust nylon construction resists corrosion and everyday wear.
- 1-Inch Interface: Standard 1″ threaded fitting (inner diameter 20 mm / outer diameter 32.7 mm, thread length 13 mm) for easy integration.
- High Insulation: Insulation resistance >100 MΩ for safe, reliable operation.
- Clean Pulse Output: Hall-effect design produces precise digital pulses with minimal signal noise — 358 pulses/liter for straightforward flow calculation.
Technical Specifications
| Model | FS400A |
| Material | Nylon |
| Interface Size | 1 inch |
| Inner / Outer Diameter | 20 mm / 32.7 mm |
| Thread Length | 13 mm |
| Working Voltage | DC 3.5 V – 24 V |
| Flow Range | 2–60 L/min (±5%) |
| Water Pressure Resistance | < 1.75 MPa |
| Pulse Characteristics | Hz = (6×Q − 2); ≈ 358 pulses/liter |
| Insulation Resistance | > 100 MΩ |
What's in the Box
- 1× FS400A Hall Water Flow Sensor / Pulse Flow Meter
Helpful Resources
For guidance on electrical safety standards in DIY electronic projects, visit the OSHA Electrical Safety page.
Frequently Asked Questions
Q: What microcontrollers are compatible with the FS400A Hall Water Flow Sensor?
A: The FS400A outputs a standard digital pulse signal and is compatible with most popular microcontrollers including Arduino (Uno, Mega, Nano), Raspberry Pi, ESP8266/ESP32, and industrial PLCs. Any controller that can read a digital interrupt or digital input pin and operate within the DC 3.5 V–24 V supply range will work seamlessly.
Q: How do I calculate the flow rate from the pulse output?
A: The sensor follows the formula Hz = (6×Q − 2), where Q is the flow rate in liters per minute (L/min). Rearranging: Q = (Hz + 2) / 6. The sensor produces approximately 358 pulses per liter, making it straightforward to calculate cumulative volume in your firmware or software.
Q: Is the FS400A suitable for hot water or chemical fluids?
A: The FS400A is designed primarily for clean, cold water applications. The nylon body offers good general fluid resistance, but it is not rated for high-temperature fluids or aggressive chemicals. For such applications, consider a stainless-steel or brass-body flow sensor instead.
Q: What pipe size does the FS400A fit?
A: The sensor features a standard 1-inch threaded interface (inner diameter 20 mm, outer diameter 32.7 mm, thread length 13 mm), making it straightforward to integrate into standard 1-inch pipework using common plumbing fittings.