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Flow Switches

$271.55

Item# FSW304

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $271.55
5-9 $257.97
10-24 $252.54
25-49 $241.68
50-99 $236.25
100+ $230.82

In stock

Lead Time ( If not in Stock): 4 weeks

Flow Switches FSW304 FSW304
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  • Adjustable Switch Point
  • Low Pressure Drop
  • Economical
  • Field Installation for ½ to 8" Pipes
  • Instant Response
  • High Repeatability

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Media Type
Flow Range
Max Operating Pressure
Max Process Temperature
Process Connection Type
Process Connection Size
Wetted Materials
Switch Rating and Type
Features


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.

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®

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