No-Flow Switches

[wppg_photo_slider id="54"]
Series: F3.05
Rotor: ECTFE
Shaft & Bearings: Ceramic
Seals: EPDM, Viton
Pipe Sizes: 1/2″ – 24″ (in two sensor lengths)
Trip Point: 0.15 m/s The normally open contact closes after a delay of 2 seconds
 Bicolour LED Red = No Flow, Green = Flow
 Visual Indication: F3.82.H Model: 25 to 150 l/h (0.11 to 0.66 gpm)
Relay Output: Mechanical SPST contact, No Flow = open contact 1A @ 24 VDC, 0.5A @ 125 VAC, 0.1A @ 230 VAC

Contact Us

I Require *(Required)
My Need Is *(Required)
Signup For Our eNewsletters:(Required)
* required field


No-Flow Switches

Type F3.05 No-Flow Switches offer reliable pump protection. They open an electrical circuit when flow velocity decreases below 0.15 m/s (0.5 ft./sec.) and are not adjustable. The unique Halar paddle wheel design is not available from other manufacturers.

✓ Reliable Pump Protection
✓ Visual Flow Indication



Type F3.05 No-Flow Switches F3.05 Compatibility Chart


Installation Fittings Size Materials Pressure Temperature
Tees Socket Threaded Flanged 1/2" to 1-1/2" Body: PVC, PP, PVDF Seals: EPDM, Viton 150 psi @ 20C (70F)
Bolt-On Saddles 1-1/2" to 12" Body: PVC Insert: CPVC, PVDF Seals: EPDM, Viton, Nitrile 150 psi @ 20C (70F)
Metal Strap-On Saddles 3" to 18" Body: Cast Iron/SS Insert: PVCSeals: Nitrile 150 psi @ 20C (70F)
Weld-On Adaptors 1-1/2" to 24" 316 SS Carbon Steel PE Other materials are available 365 psi with metal F3.00 sensor
316 SS FNPT Tees 3/4" to 1-1/4" 316 SS 365 psi with metal sensor
Plugs for Installation Fittings Body: PVC, CPVC, PP, PVDF Seals: EPDM, Viton