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Flow Switches

Item# FSW301

Flow Switches Flow Switches
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.
FSW301
  • Adjustable Switch Point
  • Low Pressure Drop
  • Economical
  • Field Installation for ½ to 8" Pipes
  • Instant Response
  • High Repeatability
Connection Size
Flow Rate
Body Material
Compatible Media
Features
 This item is available for quick shipping
See All Options
Quantity Price each
1-9 $239.99
10-24 $227.99
25-49 $223.19
50-99 $213.59
100-199 $208.79
200+ $203.99

In stock

Lead Time ( If not in Stock): 4 weeks

Product Specs

  • Maximum Rating 26 VA
  • Maximum Switching Current 1 A
  • Maximum Pressure 25.165 bar (365 psi)
  • Maximum Switching Voltage 230 Vac
  • Shaft Material Stainless steel

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.

  • CE Icon CE

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