PFT-HAN-B611-S – High-Quality HVAC Flow Switch

1. What is a Flow Switch? Its Role in HVAC Systems

A flow switch is a device used to detect the presence or absence of flow (water, gas, oil, etc.) in a pipeline. When flow is detected, the switch changes state (on/off) to trigger equipment, send alerts, or relay signals to a central monitoring system.

In HVAC systems, flow switches are typically installed on:

• Chilled or hot water pipelines
• Inlet/outlet lines of equipment like AHUs, FCUs, circulation pumps, cooling towers
• Areas where continuous fluid circulation is essential to protect equipment
• Main functions include:
• Alerting when there’s no flow
• Starting or stopping pumps, chillers, fans, etc.
• Preventing overheating or dry operation
• Integration with BMS for remote monitoring

2. Introducing Model PFT-HAN-B611-S

The PFT-HAN-B611-S is a standout model from the PFT flow switch series, designed specifically for HVAC systems in high-rise buildings, factories, hospitals, shopping malls, and industrial zones.

Technical Specifications:

• Type: Mechanical paddle switch
• Pipe size compatibility: DN25 – DN200
• Working pressure: Max. 10 bar
• Fluid temperature range: -10°C ~ 110°C
• Body material: Brass or SUS304 stainless steel
• Output contact: SPDT
• Protection rating: IP65
• Applications: HVAC systems, pumps, chillers, cooling fans, cooling towers

3. Key Advantages of the PFT-HAN-B611-S

• Flexible design: Adjustable paddle length for various pipe sizes
• Stable performance: Handles high temperature and pressure, ideal for tough environments
• Durable materials: Corrosion-resistant, long service life
• BMS compatibility: Easily integrates with building management systems
• Energy-saving: Automatically stops equipment when no flow is detected, reducing power waste

4. Typical Applications

• Commercial buildings: Monitoring chilled/hot water in central HVAC systems
• Industrial plants: Monitoring cooling water, protecting vital equipment
• Pump stations & cooling towers: Efficient pump operation management
• Hospitals & data centers: Ensures continuous cooling for critical equipment

5. Installation & Maintenance

Installation:

• Mount on a horizontal pipeline with paddle aligned to flow direction
• Cut paddle to the appropriate length based on pipe diameter (guidelines provided)

Maintenance:

• Periodically inspect contact points
• Clean paddle if debris is present
• Replace paddle if deformed

6. Why Choose Products from DLK?

Authorized distributor – competitive pricing

Fast, professional technical support

In-stock availability – quick nationwide delivery

7. Conclusion

The PFT-HAN-B611-S flow switch is an ideal solution for HVAC systems, thanks to its smart design, high sensitivity, durability, and ease of integration. DLK is proud to be the official distributor of this product in Vietnam, offering efficient, cost-saving, and safe solutions for all technical projects.