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SERIES FS-2
VANE FLOW SWITCH
FLOW
Low Cost, Field Adjustable Set Point and Paddle
2-13/32
[61.1]
Shown with conduit connection option
4-17/64
[108.3]
3-1/32
[77]
5-49/6
[146.5]
x
The Series FS-2 Vane Flow Switch offers an economical ow proving solution. The
FS-2 paddles are adjustable to t 1 to 8˝ size pipe.
BENEFITS/FEATURES
• Field adjustable set point adjustment screw allows for easy ow switch modication
• Custom application set points enabled by eld adjustable vane layers
• Aluminum weatherproof housing permits outdoor installation
APPLICATIONS
• Boiler ow proving
• Hot water heaters
• Chillers
• Cooling lines
• Machinery
• Liquid transfer systems
APPROXIMATE ACTUATION/DEACTUATION FLOW RATES FOR WATER; GPM (LPM)
Pipe Size
1˝
Paddle
1-1/4˝
1-1/2˝
Flow Switches,
2˝
2-1/2˝
3˝
4˝
5˝
6˝
8˝
Blade Vane Length
in (mm) Dim. X
1.34 (34)
1.34 (34)
2.24 (57)
2.24 (57)
3.46 (88)
3.46 (88)
3.46 (88)
6.57 (167)
6.57 (167)
6.57 (167)
Minimum Setting Maximum Setting
Actuate Deactuate Actuate Deactuate
4.0 (15.0)
5.3 (20.0)
7.0 (26.7)
14.1 (53.3)
18.5 (70.0)
27.7 (105.0)
59.4 (225.0)
52.8 (200.0)
75.7 (286.7)
184.9 (700.0)
1.8 (6.7)
2.6 (10.0)
4.0 (15.0)
9.7 (36.7)
15.4 (58.3)
25.1 (95.0)
52.8 (200.0)
39.6 (150.0)
52.8 (200.0)
158.5 (600.0)
8.8 (33.3)
11.4 (43.3)
14.5 (55.0)
31.3 (118.3)
35.2 (133.3)
52.8 (200.0)
123.3 (466.7)
132.1 (500.0)
154.1 (583.3)
396.3 (1500.0)
SPECIFICATIONS
Service: Compatible liquids.
Wetted Materials: Bellow: Tin-bronze; Vane: SS; Body: Forged brass.
Temperature Limit: 230°F (110°C).
Pressure Limit: 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.
Enclosure: Die-cast aluminum alloy.
Weight: 28.22 oz (0.8 kg).
Compliance: CE.
6.6 (25.0)
8.4 (31.7)
11.4 (43.3)
22.5 (85.0)
30.8 (116.7)
46.2 (175.0)
114.5 (433.3)
123.3 (466.7)
140.9 (533.3)
374.2 (1416.7)
MODEL CHART
Model Description
FS-2 Paddle ow switch
OPTIONS
To order add sufx: Description
-BSPT Process connection
Example: FS-2-BSPT
-CND Conduit connection, 1˝ NPT female conduit connection with no wire leads
Example: FS-2-CND
DWYER INSTRUMENTS, LLC | dwyer-inst.com276
USA: California Proposition 65
WARNING: This product can expose you to chemicals including Lead, which is known to the State
of California to cause cancer and birth defects or other reproductive harm. For more information go
to www.P65Warnings.ca.gov.
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