Series FS-2 Vane Flow Switch

Low Cost, Field Adjustable Set Point and Paddle

The Series FS-2 Vane Flow Switches offers an economical flow proving solution. The FS-2 paddles are adjustable to fit 1 to 8" size pipe.

California Residents: Click Here for Proposition 65 WARNING.

Product Applications

  • Boiler flow proving
  • Hot water heaters
  • Chillers
  • Cooling lines
  • Machinery
  • Liquid transfer systems

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Model Description Usually Ships* Price Order
Ships: Next Day
Price: $68.00
Paddle flow switch, 1" male NPT. Next Day* $68.00 Order
Ships: Next Day
Price: $68.00
Paddle flow switch, 1" male BSPT. Next Day* $68.00 Order
Ships: Next Day
Price: $68.00
Paddle flow switch, NPT process connection, conduit electrical connection Next Day* $68.00 Order
Ships: Call for Details
Price: $68.00
Paddle flow switch, 1" male NPT connection with 8 ft leads Call for Details* $68.00 Order


Compatible liquids.
Wetted Materials:
Bellow: Tin-bronze; Vane: SS; Body: Forged brass.
Temperature Limits:
230°F (110°C).
Pressure Limits:
145 psig (10 bar).
Enclosure Rating:
NEMA 4 (IP64).
Switch Type:
SPDT snap switch.
Electrical Rating:
10 A res, 3 A ind @ 250 VAC.
Electrical Connection:
Cable gland with attached wire leads or optional conduit connection.
Process Connection:
1" male NPT or BSPT.
Mounting Orientation:
Switch must be installed vertically on horizontal pipe runs.
Set Point Adjustment:
Four vane combinations and an adjustment screw.
Die-cast aluminum alloy.
28.22 oz (0.8 kg).
Agency Approvals:


  • Field adjustable set point adjustment screw allows for easy flow switch modification
  • Custom application set points enabled by field adjustable vane layers
  • Aluminum weatherproof housing permits outdoor installation


Model Number Description Usually Ships* Price Order
Replacement vane assembly FS-2-VANE Replacement vane assembly Call for Details $11.75 Order

Product Literature


Catalog Pages




What does actuation and de-actuation mean?
Actuation means that the flow rate has reached a point where the microswitch trips or the contacts of the microswitch change state. De-actuation means that the flow rate has decreased to a point where the microswitch returns to its normal state.
On your Flow Switches, which model has a Form C type contact
Form C contact is a SPDT snap switch. Many of Dwyer’s flow switches have SPDT snap switches. The V4, V6, V7, FS-2, and V8 are some of them.

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