Series V7 Vane Operated Flow Switch
Specifications - Installation and Operating Instructions
Bulletin F-V7
®
The Series V7 Flotect
®
Flow Switch is an inexpensive switch for use with com-
patible liquids to start or stop electronic operated equipment when flow or no-flow
conditions occur. Magnetic operation is simple and dependable with no mechanical
linkages or seals to wear or leak. Lower body is machined solid metal bar stock as-
suring no leak points, no matter how long the unit is in service. Design is standard
weatherproof, meeting NEMA 4X, for application versatility. Robust vane design is
rigid and field trimmable for set point adjustment.
SPECIFICATIONS
Service: Liquids compatible with wetted materials that are non-coating and non-
crystallizing.
Wetted Materials: Vane: 301 SS, Process Connection: brass or 316 SS, Magnet:
ceramic, Other: 301, 302 SS.
Upper Body Material: Die cast aluminum.
Process Temperature Limits: -40 to 250°F (-40 to 121°C).
Maximum Ambient Temperature: 181°F (83°C).
Pressure Limits: 250 psi (17.2 bar).
Enclosure Rating: Weatherproof, meets NEMA 4X (IP66).
Switch Type: SPDT snap switch.
Electrical Rating: 10A @ 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 inch.
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.
Weight: 1 lb 2 oz (500 g).
Approvals: UL353.
W.E. ANDERSON DIV., DWYER
INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46361 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
2X 47/64
[18.65]
2-37/64
[65.48]
1/2 FEMALE
NPSM
1-3/8
[34.93]
GROUND
COMMON
NORMALLY OPEN
NORMALLY CLOSED
1 NPT
6-31/32 [177.00]
3.702
.554
11/16
[17.46]
3/4
[19.05]
A
DIM A
1-17/64 [32.15]
1-19/32 [40.48]
1-53/64 [46.43]
2-11/64 [55.17]
2-11/64 [55.17]
2-11/64 [55.17]
Pipe Size
1
1-1/4
1-1/2
2
3
4
OPERATING PRINCIPLE
The flow switch is installed in a pipe to indicate flow/no-flow status. The paddle or
vane moves against a spring mechanism in the direction of flow with respect to the
amount of flow in the pipe. A magnet is located on the end of the vane inside the
lower housing. A second magnet located inside the upper housing moves from
magnetic attraction with the magnet attached to the vane. This upper magnet is
attached to a lever arm that activates a snap switch. The upper housing and lower
housing are separated by solid metal with no linkages or mechanisms to fail or
wear creating leaks. The spring mechanism returns the vane to the original position
as flow decreases.
Example
Series
Construction
Lower Body
Circuit Type
Connection
Size
Vane Size
Tee & Tee
Material
Options
V7
V7
W
W
B
B
S
S
S
3
3
0
0
N
N
ST
ST
RV
V7-WBS-30N-ST
V7 Flow Switch
Weatherproof
Brass
316 SS
SPDT
1˝
Full length vane
with template
No Tee
SS tag
Reinforced vane
F-V7:V-13 2/10/10 3:42 PM Page 1
(2 pages)
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