Flow Switches

FSW300 Series

Flow Switches

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^$ 164.00 FSW301

•	Adjustable Switch Point
•	Low Pressure Drop
•	Economical
•	Field Installation for ½ to 8" Pipes
•	Instant Response
•	High Repeatability
View related products - Variable Area Flowmeters, Rotameters & 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.

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^®

To Order (Specify Model Number)

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Part Number	Availability	Price	Description	Qty.

Insertion Style Switches

FSW301		$164.00	Flow switch, insertion ½ male NPT, setpoint adjustable from 4.0 to 132 GPM	qty.


Brass Tee Switches

FSW302		$186.00	Flow switch inline 1/2" brass tee, 0.9 to 1.1 GPM setpoint range	qty.

FSW303	1 Week	$186.00	Flow switch, inline 3/4" brass tee, 1.8 to 2.4 GPM setpoint range	qty.

FSW304		$186.00	Flow switch inline 1" brass tee, 3.5 to 4.4 GPM setpoint range	qty.


PVC Tee Switches

FSW305		$150.00	Flow switch, inline 1/2" PVC tee, 1.3 to 1.8 GPM setpoint range	qty.

FSW306		$150.00	Flow switch, inline 3/4" PVC tee, 2.5 to 3.2 GPM setpoint range	qty.

FSW307		$150.00	Flow switch, inline 1" PVC tee, 2.8 to 3.9 GPM setpoint range	qty.

70A-2		$24.00	Fast pulse tone audible alarm	qty.

† All dollar amounts on this site are shown in US currency.

Note: Comes complete with operator’s manual.

Ordering Example: (1) FSW301 insertion style flow switch with 1/2 NPT fitting, $164.00, plus (1) 70A-2 fast pulse tone audible alarm, $24.00, $164.00 + 24.00 = $188.00

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