Product Overview

The NOIKE-AH Paddle Flow Switch NFS22 is a high-reliability mechanical flow switch engineered for industrial flow monitoring and equipment protection. Developed to overcome the limitations of conventional paddle flow switches, the NFS22 features a simplified, robust mechanical structure with a built-in micro switch for accurate and repeatable flow detection.

Its plug-and-play design, low pressure loss, and adjustable switching point make it an ideal solution for monitoring water, oil, and other liquid or gas media in industrial automation, HVAC, refrigeration, and compressed air systems.

Unlike conventional magnetic flow switches, the sensing mechanism is isolated from the flowing medium, allowing reliable operation even in contaminated water or wastewater applications.

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Working Principle

The NFS22 operates using a mechanical paddle (baffle) sensing principle.

As fluid flows through the pipeline, it pushes the internal paddle. Once the flow reaches the preset value, the paddle actuates the built-in micro switch through a precision mechanical linkage.

The switch then changes its contact status (SPDT), providing a reliable control signal for pumps, valves, alarms, or industrial control systems.

The switching point can be easily adjusted using the external adjustment knob to match different application requirements.

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Key Features

• Mechanical paddle flow sensing technology
• Plug-and-play installation
• Adjustable switching point via external knob
• Built-in high-quality micro switch
• Low pressure loss for improved system efficiency
• Excellent repeatability and long-term reliability
• Strong resistance to contamination and fouling
• Mechanical and electrical components completely isolated
• No bellows or magnetic switch design
• Optional status indicator LED
• Suitable for clean water and wastewater applications
• Available with DIN connector or direct cable wiring
• Customizable high-pressure versions available

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Technical Specifications

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Industrial Applications

The Flow Switch NFS22 is suitable for a wide range of industrial flow monitoring applications, including:

• Industrial automation
• Mechanical equipment
• HVAC systems
• Refrigeration equipment
• Air compressors
• Hydraulic systems
• Cooling water systems
• Lubrication systems
• Pump protection
• Wastewater treatment
• Process water monitoring
• Industrial circulation systems

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Product Advantages

Compared with conventional mechanical flow switches, the NFS22 offers several significant advantages:

• Simplified and highly reliable mechanical structure
• No bellows that can fatigue or fail
• Electrical components isolated from temperature fluctuations
• No condensation-related electrical corrosion
• Imported micro switch provides reliable switching performance
• Lower pressure loss than traditional paddle switches
• Easy installation and commissioning
• Adjustable switching threshold
• Suitable for contaminated liquids and wastewater
• Long service life with minimal maintenance

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Installation Recommendations

For optimum performance:

• Install according to the indicated flow direction.
• Ensure the paddle is fully inserted into the pipeline.
• Select the correct paddle size based on pipe diameter.
• Avoid installation immediately downstream of elbows or valves where excessive turbulence exists.
• Adjust the switching point after installation according to the required minimum flow.
• Periodically inspect the paddle when operating in heavily contaminated media.

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Typical Industries

The NFS22 is widely used in:

• HVAC
• Industrial Automation
• Chemical Processing
• Machinery Manufacturing
• Water Treatment
• Wastewater Treatment
• Food Processing
• Pharmaceutical
• Petrochemical
• Mining
• Power Plants
• Air Compression Systems
• Refrigeration Equipment

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Frequently Asked Questions (FAQ)

1. How does the paddle flow switch NFS22 work?

The NFS22 uses a mechanical paddle that moves with fluid flow. When the flow reaches the preset value, it activates an internal SPDT micro switch to provide a control signal.

2. Is the switching point adjustable?

Yes. The flow setpoint can be quickly adjusted using the external adjustment knob without replacing internal components.

3. Can the NFS22 be used for wastewater?

Yes. Since the magnetic components are not located inside the flowing medium and the structure has strong anti-contamination capability, it performs reliably in wastewater and contaminated liquid applications.

4. What output does the NFS22 provide?

The standard model provides an SPDT micro switch output (Normally Open + Normally Closed). Single-point or dual-point output versions are available.

5. What is the maximum operating pressure?

The standard pressure rating is 25 bar, while higher-pressure versions can be customized.

6. What electrical connection options are available?

The NFS22 supports both DIN 43650A connectors and direct cable wiring, depending on installation requirements.

7. What industries commonly use the NFS22?

The NFS22 is widely used in HVAC, refrigeration, industrial automation, compressed air systems, cooling water systems, machinery, hydraulic equipment, and wastewater treatment.

8. What makes the NFS22 different from traditional paddle flow switches?

Its optimized mechanical structure eliminates common failure points such as bellows, isolates electrical components from moisture and temperature effects, uses a durable imported micro switch, and provides lower pressure loss with improved reliability.

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Why Choose the NOIKE-AH NFS22?

The NOIKE-AH Paddle Flow Switch NFS22 combines simple mechanical operation, high reliability, excellent anti-contamination performance, and easy installation into a dependable industrial flow monitoring solution. Its robust construction, adjustable setpoint, and low maintenance requirements make it an excellent choice for protecting pumps, compressors, cooling systems, and industrial process equipment.

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Dimensional drawing (in millimeters)