Description
Honeywell Flow Switch
Overview
The Honeywell Flow Switch is a precision-engineered monitoring device designed for reliable flow detection in liquid, air, and gas systems across commercial, industrial, and fire protection applications. Manufactured by Honeywell — a Fortune 100 global leader in building technologies and fire safety — this flow switch delivers accurate, dependable performance for operational control, interlocking protection, and system safety.
A flow switch is a sensing device that monitors the flow rate of a fluid or gas within a pipe or duct. When the flow rate reaches above or below a predefined set point, the switch activates a single-pole double-throw (SPDT) output, closing one circuit and opening another. This capability makes it an essential component for pump protection, cooling system monitoring, air handling unit control, and fire sprinkler systems , where it plays a critical role in detecting water flow to sprinkler heads .
Honeywell offers a comprehensive range of flow switches to suit diverse requirements — from paddle-type water flow detectors and electronic liquid/gas flow monitors to air flow switches for HVAC ducts and low-flow shuttle-type switches for central heating systems.
Available Models
| Model | Description |
|---|---|
| WFS Series (WFS6000 / WFS8000) | Paddle-type SPDT liquid flow switch for water and compatible fluids; designed for operational control, interlocking, and close-off protection; widely used in fire fighting and HVAC applications |
| WFDNF Series | Rugged water flow detector for fire sprinkler systems; NEMA 4 rated; two sets of SPDT synchronized switches; adjustable mechanical time delay (30-60 seconds) to prevent false alarms; UL listed with tamper-resistant cover |
| KSW Series | Compact electronic flow monitor for liquids and piped gases; no moving parts; precise sensitivity adjustment via rough/fine potentiometer; yellow LED status indication; suitable for cooling/heating circuits with up to 35% glycol; prevents dry pump running |
| S6065 Series | Liquid flow monitor for coolants in air-conditioning and refrigeration systems; fully encapsulated microswitch; available in V4A version for aggressive liquids; low-cost solution |
| S6040 Series (FEMA Air Flow Switch) | Air flow monitor for ducts of air-conditioning and air-purification systems; SPDT configuration; adjustable set point for air velocities from 2.5 to 9.2 m/s |
| FRN Series | Low-flow shuttle-type switch for very low flow rates (1.0 ± 0.5 L/min); minimal pressure drop; available in Noryl™ thermoplastic and dezincificated brass housings; suitable for central heating, shower control, and mains water applications |
Key Features
| Feature | Description |
|---|---|
| SPDT Output | Single-pole double-throw switch provides contact closure for alarms, interlocks, and control systems |
| Adjustable Set Point | Field-adjustable flow rate thresholds to suit specific system requirements |
| Mechanical Time Delay | Adjustable delay (up to 90 seconds) minimizes false alarms due to pressure surges or air trapped in fire sprinkler systems |
| Multiple Media Compatibility | Suitable for water, non-corrosive liquids, coolants (up to 35% glycol), air, non-aggressive gases, and aggressive liquids (with suitable material selection) |
| Durable Construction | Available in brass, stainless steel, Noryl™ thermoplastic, and robust NEMA 4 rated enclosures for indoor/outdoor use |
| Easy Installation | Compact design with various connection options including threaded, compression fittings, and duct mounting |
| Visual Status Indication | LED indicators for switching state and flow direction marking for easy inspection |
| UL Listed Options | UL-listed models available for fire protection applications; tamper-resistant cover prevents unauthorized entry |
| Fire Sprinkler Monitoring | Designed for primary signaling in fire protection systems; switch synchronization activates both alarm panel and local bell/horn strobe |
| No Moving Parts (Electronic Models) | KSW series offers maintenance-free operation with no mechanical parts to wear |
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Honeywell |
| Switch Configuration | SPDT (Single Pole Double Throw) / Form C |
| Contact Rating | Up to 15A @ 250V AC (model dependent) |
| Operating Pressure | Up to 10 kg/cm² (1000 kPa) |
| Operating Temperature | -40°C to +100°C (model dependent) |
| Flow Media | Water, liquids, coolants, air, non-aggressive gases |
| Mounting | In-line pipe, duct, vertical orientation |
| Enclosure Rating | NEMA 4 / IP54 (WFDNF models) |
| Certifications | UL Listed, PESO Approved (select models), Material Water Research Council approved |
Why Choose Honeywell Flow Switch?
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Trusted Global Brand — Honeywell is a Fortune 100 company with decades of expertise in building technologies, fire safety, and industrial sensing
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Comprehensive Range — Wide selection of flow switches for liquid, air, and gas applications across HVAC, fire protection, and industrial sectors
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Proven Fire Protection Solutions — Honeywell flow switches are industry-standard components for fire sprinkler monitoring, trusted by engineers and fire safety professionals worldwide
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Reliability & Accuracy — Precision-engineered for repeatable, dependable performance in critical applications
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Easy Integration — Compatible with building management systems, fire alarm control panels, and industrial automation platforms
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Minimised False Alarms — Adjustable time delay and stable detection mechanisms reduce nuisance alarms in fire sprinkler systems
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Durable & Long-Lasting — Rugged construction with corrosion-resistant materials ensures long service life in demanding environments
Ideal Applications
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Fire Sprinkler Systems — Water flow detection for primary signaling and alarm activation
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HVAC Systems — Air flow monitoring in ducts; cooling and heating circuit monitoring
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Pump Protection — Preventing dry running by detecting loss of flow
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Industrial Process Lines — Monitoring flow in water, chemical, and utility pipelines
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Refrigeration Systems — Coolant flow monitoring in air-conditioning and refrigeration
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Central Heating — Low-flow detection in domestic and commercial heating systems
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Water Distribution — Mains water monitoring and control
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Commercial Buildings — Office complexes, hospitals, hotels, and government facilities
Compliance & Standards
| Standard | Description |
|---|---|
| UL Listed | Underwriters Laboratories certification for fire protection equipment |
| NEMA 4 / IP54 | Enclosure rating for indoor/outdoor use |
| Material Water Research Council Approved | Approved for potable water applications (FRN Series) |
| PESO Approved | Approved for use with fire protection systems in India (select models) |
For detailed product inquiries, technical specifications, bulk order pricing, or to place an order, please contact our sales team.
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