Kelco F21 25mm Heavy Duty Corrosion Resistant Poly Flow Switch

The Kelco F-H-25B Polypropylene Flow Switch is a tough yet highly sensitive paddle-type switch designed for reliable flow detection and control in both hot and cold liquid applications. Featuring a corrosion-resistant polypropylene wet end, it is ideal for use in seawater, bore water, acids, alkalis, and a wide range of chemical solutions.

Its modular design separates the electrical housing from the wet end, allowing the switch to be removed from pipework for servicing without disturbing electrical wiring. This makes installation, maintenance, and replacement fast and straightforward.

A built-in manual override (standard on all F-H models) enables manual system activation at the press of a button—perfect for pump testing, commissioning, or emergency operation when there is no flow present.

The seal-less magnetic drive eliminates diaphragms, seals, and bellows, removing common failure points and ensuring long-term reliability. The supplied glass fibre reinforced paddle can be cut to suit pipe sizes of 25mm (1") and above, with a Paddle Trimming Calculator available from Kelco for precise adjustment.

FEATURES

• Australian-made, heavy-duty paddle flow switch
• All-polypropylene wetted parts for maximum corrosion resistance
• Manual override for instant pump/system activation
• Modular design for easy servicing without rewiring
• Seal-less magnetic drive for enhanced durability
• Glass fibre reinforced trim-to-fit paddle (≥25mm pipework)
• Weatherproof IP67 housing
• 0–500V AC, 15A SPDT switch (low-voltage reed switch model available)
  

SPECIFICATIONS

• Process connection: 1" BSP (25B)
• Max operating pressure: 18 bar (261 psi) at ambient temperature
• Max burst pressure: 45 bar (652 psi)
• Operating temperature: -20°C to 60°C (de-rated above 60°C)
• Ingress protection: IP67
• Electrical rating: SPDT 0–500V AC, 15A (H model)

APPLICATIONS

• Water treatment & filtration systems
• Irrigation and pump protection
• Chemical processing and dosing systems
• Bore water and seawater pumping
• HVAC and industrial process control