Overview
Upgrade your fluid control system with this premium 304 stainless steel inline water flow switch, designed for reliable, long-life flow detection in demanding industrial and commercial environments. Unlike plastic-bodied alternatives, this flow switch features a full 304 stainless steel shell and probe, offering exceptional resistance to corrosion, high pressure, and harsh media. Whether you’re protecting pumps from dry-running, controlling heating systems, or monitoring process lines, this switch delivers fast, accurate, and repeatable switching performance.
How It Works
This flow switch uses a spring-loaded magnetic core displacement principle to detect flow without requiring external power for sensing:
- When fluid in the pipeline reaches or exceeds 0.75 L/min, the flowing water displaces the internal magnetic core against the reset spring. This movement causes the magnetic source to generate a magnetic control effect, triggering the sensor to output a “1” (ON) switching signal. This signal is sent to the equipment’s control system where, after power amplification, it activates the desired control function — such as starting a pump, enabling a heater, or triggering an alarm.
- When the flow rate drops below 0.75 L/min, the reset spring pushes the magnetic core back to its original resting position. The magnetic source returns to its default state, causing the sensor to output a “0” (OFF) switching signal, which halts the system’s operation and provides protection against low-flow or no-flow conditions.
This automatic, mechanically driven mechanism ensures consistent, reliable protection with no need for manual intervention or recalibration under normal operating conditions.
Key Features
- Full 304 stainless steel construction – Shell and probe both made from 304 SS for maximum corrosion resistance and compatibility with water, mild chemicals, and industrial fluids
- IP65 protection rating – Fully dust-tight and protected against low-pressure water jets, suitable for wet or outdoor environments
- Fast 0.5-second response time – Near-instant switching for time-critical control applications
- 1,000,000-cycle mechanical life – Engineered for years of continuous, maintenance-free operation
- 0.75 L/min trigger threshold – Sensitive, low-flow detection ideal for protecting equipment from dry-run conditions
- Spring-reset mechanism – Reliable return to OFF state when flow ceases, with no residual signal risk
- Digital switch output – Clean “0” / “1” switching signal for seamless integration with PLCs, microcontrollers, and control panels
- Compact inline design – Easy drop-in installation into existing pipelines with standard threaded fittings
Specifications
| Parameter | Value |
|---|---|
| Shell Material | 304 Stainless Steel |
| Probe Material | 304 Stainless Steel |
| Product Series | Flow Switch |
| Protection Level | IP65 |
| Trigger Flow Rate | 0.75 L/min |
| Overload Current | 0.5A |
| Response Time | 0.5 seconds |
| Mechanical Life | 1,000,000 cycles |
| Display Method | Switch Quantity (Digital ON/OFF) |
| Output Signal | “0” (OFF) / “1” (ON) |
Applications
- Pump dry-run protection systems
- Instantaneous and storage-type electric water heaters
- Industrial process flow monitoring
- Cooling water circulation systems
- Water purification and filtration equipment
- Hydraulic and pneumatic control systems
- Solar thermal and HVAC systems
- Chemical dosing and dispensing equipment
Why Choose Stainless Steel Over Plastic?
| Feature | 304 SS Flow Switch | Standard PP Flow Switch |
|---|---|---|
| Corrosion Resistance | ✅ Excellent | ⚠️ Moderate |
| Pressure Rating | ✅ Higher | ⚠️ Lower |
| Temperature Tolerance | ✅ Wider range | ⚠️ Limited |
| Durability | ✅ Industrial-grade | ⚠️ Consumer-grade |
| Media Compatibility | ✅ Broader | ⚠ Water/mild fluids only |
