Series FS-2 Vane Flow Switch

Series FS-2 Vane Flow Switch

Representative image displayed of V6EPB-B-D-1-B|Actual product may vary


Series V7 Flotect® Vane Operated Flow Switch

Magnetic Linkage, UL Approved

The Series V7 Flotect® Flow Switch is an inexpensive range switch for use with compatible liquids to start or stop electronic operated equipment when flow or no-flow conditions occur. Design is standard weatherproof, meeting NEMA 4X.

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Product Applications

  • Proof of boiler flow
  • Shuts down burner when air flow through heating coil fails
  • Protects pumps, motors and other equipment against low or no flow
  • Stops liquid cooled engines, machines and processing when coolant flow is interrupted
Starting at $128.95
Grouped product items
Model Description Availability* Qty Price
V7-WBS-30N Flotect® vane operated flow switch, weatherproof, brass body, 1" NPT, trimmable vane. 1-3 days*


Liquids compatible with wetted materials that are non-coating and noncrystallizing.
Wetted Materials:
Vane: 301 SS, Process connection: Brass or 316 SS, Magnet: Ceramic, Other: 301, 302 SS.
Upper Body Material:
Die cast aluminum.
Temperature Limits:
-40 to 250°F (-40 to 121°C).
Pressure Limits:
250 psi (17.2 bar).
Enclosure Rating:
Weatherproof, meets NEMA 4X (IP66).
Switch Type:
SPDT snap switch.
Electrical Rating:
10 A @ 125, 250, 480 VAC; 1/8 hp @ 125 VAC, 1/4 hp @ 250 VAC.
Electrical Connections:
3 screw type, common, normally open and normally closed.
Conduit Connection:
1/2" NPSM.
Process Connection:
1" male NPT. Contact factory for optional tees.
Pipe Size:
1" to 4".
Mounting Orientation:
Horizontal or vertical (actuation flow rates are based on horizontal pipe runs in the vertical position). Will not work in vertical pipe with down flow.
Set Point Adjustment:
Vane is trimmable, see set point chart on Catalog page.
1 lb 2 oz (500 g).
Agency Approvals:


  • Superior performance with magnetically-actuated switching design
  • Increased product life due to free-swinging vane, which attracts a magnet within the solid metal switch body to actuate a snap switch by means of a simple lever arm with no bellows, springs, or seals to fail
  • Meets application requirements with durable leak proof body machined from bar stock
  • Long operating life with robust vane design which is rigid and field trimmable for set point adjustment

Product Literature


Catalog Pages

Model Chart

EXAMPLE V7 W B S 3 0 N ST Series V7-WBS-30N-ST Flotect® Vane Operated Flow Switch, weatherproof, brass lower body, SPDT, 1" male NPT, trimmable vane, with stainless steel tag.
SERIES V7               Flotect® Vane Operated Flow Switch
CONSTRUCTION   W             Weatherproof
CIRCUIT TYPE       S         SPDT
CONNECTION SIZE         3       1"
VANE SIZE           0     Full Length Vane with Template
TEE & TEE MATERIAL             N   No Tee
OPTIONS               ST
Stainless Tag Tag
Reinforced Vane


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.
What material is used as a seal between the process fluid and the electrical portion of the switch?
The body material; as there is no separate "seal" since the body is machined from solid stock and the switch is magnetically actuated.
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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Model Description Availability* Price