Flow control in refrigeration circuits is essential to ensure energy efficiency, protect compressors, and prevent costly system downtime.
Elettrotec’s FPR paddle flow switch provides a reliable solution for monitoring circulation in industrial refrigeration and air conditioning systems.
Definition and applications of the paddle flow switch
The paddle flow switch is an electromechanical device that detects the presence or absence of flow inside a pipeline. When the refrigerant liquid circulates at a sufficient flow rate, it moves a metal paddle that activates a magnetic contact. This on/off signal is used to control compressors, pumps, or alarm systems.
Unlike electronic sensors, the mechanical operating principle of the flow switch makes it particularly robust and immune to electromagnetic interference — a key feature in industrial environments with numerous electrical devices.
Applications in refrigeration and air conditioning systems
Chillers and industrial refrigeration units
In industrial chillers, the FPR flow switch monitors the circulation of chilled water through the evaporator. In the event of flow loss — caused by pump failure, filter blockage, or accidental valve closure — the device immediately sends a signal that:
- Stops the compressor before evaporator freezing occurs
- Activates an alarm for maintenance intervention
- Prevents costly damage to refrigeration components
Cold rooms and industrial refrigeration chambers
In industrial cold rooms for food or pharmaceutical storage, refrigerant flow control is critical. The FPR is installed on:
- Glycol circuits for evaporators
- Supply lines for fan coil units
- Water defrost systems
The protection provided by the flow switch prevents interruptions in the cold chain, avoiding product losses and potential regulatory violations.
VRF/VRV systems for industrial air conditioning
Industrial variable refrigerant flow (VRF/VRV) air conditioning systems used in commercial buildings, hospitals, and data centers require accurate monitoring of hydronic circuits. The FPR ensures:
- Protection of terminal units
- Proper system balancing
- Optimal energy efficiency
Heat exchangers and industrial heat pumps
In heat exchangers used for energy recovery and in industrial heat pumps, the flow switch monitors circulation on both the primary and secondary sides. This prevents:
- Localized overheating
- Loss of heat exchange efficiency
- Premature wear of equipment
Air conditioning for data centers
Data centers require precision cooling systems to maintain constant temperature and humidity levels. The FPR is used in server rack cooling circuits, ensuring operational continuity and preventing costly downtime caused by overheating of IT equipment.
Key advantages of the Elettrotec FPR for refrigeration applications
Mechanical reliability in critical conditions
The electromechanical technology of the FPR flow switch ensures:
- Resistance to low temperatures: Operating range from -25°C to +100°C
- Robust construction: Black PPO body with high impact resistance
- Extended service life: No delicate electronic components prone to failure
Customization for refrigerant fluids
Each refrigeration system uses specific fluids (water, glycol, brines). The FPR offers:
- Custom calibration based on the fluid used (from 2 to 27 l/min in water)
- Selectable paddle materials: standard brass, stainless steel for concentrated glycol, PTFE for aggressive fluids
- Standard connections from G1/2″ to G1 1/2″ for easy integration
Quick installation and reduced maintenance
Installation on a standard T-fitting allows integration even into existing systems without structural modifications. The IP65 protection rating ensures resistance to the humidity typical of refrigerated environments.
The simple design minimizes maintenance requirements, resulting in reduced TCO (Total Cost of Ownership).
Regulatory compliance and certifications
Industrial refrigeration and air conditioning systems are subject to stringent technical regulations:
Reference standards
- PED Directive 2014/68/EU: Pressure equipment (systems operating above 10 bar require specific assessments)
- EN 378: Safety and environmental requirements for refrigeration systems
- F-Gas Regulation (EU) 517/2014: Leak control in refrigeration systems
- Machinery Directive 2006/42/EC: Component safety
FPR Certifications
- CE marking
- RoHS and REACH compliance
- Maximum static pressure: 10 bar
- Protection rating: IP65
The flow switch contributes to regulatory compliance by providing documented evidence of continuous refrigerant circulation monitoring, a requirement for system certification.
Request a customized consultation
Every application in refrigeration and air conditioning systems has unique characteristics. Elettrotec’s technical team is available to:
- Analyze your system specifications
- Recommend the optimal FPR configuration
- Provide pre- and post-sales technical support
- Develop customized solutions for specific requirements
Discover all the technical details and available configurations of the FPR – paddle flow switch for liquids.
Explore the complete range of Elettrotec flow switches to find the perfect solution for your application.
Don’t let flow issues compromise your production: contact our technical department.