The FSW301 flow switch comprises a paddle system with a permanent magnet attached. Above that magnet is a reed contact, located outside the flow of fluid. A second magnet with opposing poles creates the force necessary to reset the switch back to the no flow position.
When the monitored flow pushes the paddle and changes the position of the magnet in relation to the reed contact it activates the contact. As soon as the flow is interrupted, the paddle moves back to its starting position, which returns the reed contact to the initial position. The force necessary to push the magnet back is provided by the two magnets repelling each other. Using magnetic force instead of the usual leaf spring means the switch is considerably more stable in the long term and much less sensitive to pressure peaks.
The reed contact used as a sensing element consists of two ferromagnetic contact blades located in a glass bulb filled with inert gas. This practically eliminates wear resulting from contact burning. This construction allows a useful life of up to 100,000,000 switching cycles.
COMMON SPECIFICATIONS Maximum Switching Current: 1 A Maximum Switching Voltage: 230 Vac, 48 Vdc Maximum Rating: 26 VA, 20 W Set Point Tolerance: ±15% Plug Connector: DIN 43650 form A/ISO 4400 cable socket with terminal screws, suitable for outer cable diameter 4.57 to 6.85 mm (0.18 to 0.27') Dimensions (Excluding Paddle or Tee): 114 x 38 x 89 mm (4.5 x 1.5 x 3.5')
FSW301 Maximum Pressure: 25.165 bar (365 psi) Maximum Process Temp: 110°C (230°F) Maximum Ambient Temp: 80°C (176°F) Protection Class: IP65 Connection: ½-14 NPT Materials of Construction: Body: Brass Paddle System: Polypropylene, Noryl® Shaft: Stainless steel
FSW302, 303, 304 Maximum Pressure: 25 bar (362 psi) Maximum Process Temperature: 110°C (230°F) Maximum Ambient Temperature: 80°C (176°F) Materials of Construction: Body: Brass Pipe Section: Brass Paddle System: Brass
FSW305, 306, 307 Maximum Pressure: 10 bar (145 psi) Maximum Process Temperature: 60°C (140°F) Maximum Ambient Temperature: 60°C (140°F) Materials of Construction: Pipe Section: PVC Body: Polypropylene, Noryl® Paddle System: Polypropylene, Noryl®