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 ferro-magnetic 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.
|Maximum Pressure: 25 bar
Maximum Process Temperature: 110°C
Maximum Ambient Temperature: 80°C
Protection Class: IP65
Process Connection: ½" BSPP Male
Maximum Switching Current: 1 A
Maximum Switching Voltage: 230 Vac, 48 Vdc
Maximum Switching Capacity: 26 VA, 20 W
Set Point Tolerance: ±15%
Plug Connector: DIN 43650 socket.
Materials of Construction:
Paddle System: Polypropylene, Noryl
Shaft: Stainless steel