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Flow Switches
When fluid movement falls outside set thresholds, flow switches trigger alarms or shutdowns that protect pumps, heaters, and cooling systems from costly damage. Mechanical, thermal, and ultrasonic models support insertion and inline installation in pipes of every size.
Filters 122 Results
122 items
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The Dwyer - FS-100-050 is a Flow Switch for Threaded Plastic Piping featuring Liquid, 0.5 GPM Switch Point, 50 VA SPST, 3/4 ", NPT Female, ± 10 % Accuracy, PP, and 12 " (300mm) Wire L. Part of the FS-100 Series. Sold individually.
Save 15%$116.00
$98.85
Should ship between 23 Aug and 30 Aug
Subject to factory lead times
The Dwyer - FSW-160 is a Flow Switch featuring Paddle, Heavy Duty, Liquid, 4 GPM to 500 GPM, 15 A SPDT, 1 ", NPT Male, ± 1 % Accuracy, 316 SS, 304 SS, Brass, and EPDM. Sold individually.
Save 15%$257.05
$219.06
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-321-SPST is a Flow Switch featuring Thermal Dispersion, Gas, 1 FPS to 90 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 3/4 " to 1-1/2 ", NPT Male, ± 5 % Accuracy, PP, PVDF, and 10 ' Wire L. Part of the FST-320 Series. Sold individually.
Save 15%$363.08
$309.43
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FSW301 is a Flow Switch featuring Low Cost, Economical, Liquid, 4 GPM to 132 GPM, 26 VA SPST, 1/2 ", NPT Male, Brass, SS, PP, and Noryl. Part of the FSW300 Series. Sold individually.
Save 17%$375.77
$313.24
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-212-SPST is a Flow Switch featuring Thermal Dispersion, Liquid, 0.04 FPS to 3 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 3/4 " to 1-1/2 ", NPT Male, ± 5 % Accuracy, PVDF, and 10 " Wire L. Part of the FST-200 Series. Sold individually.
Save 15%$570.96
$486.60
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FS-100-025 is a Flow Switch for Threaded Plastic Piping featuring Liquid, 0.25 GPM Switch Point, 50 VA SPST, 3/4 ", NPT Female, ± 10 % Accuracy, PP, and 12 " (300mm) Wire L. Part of the FS-100 Series. Sold individually.
Save 15%$109.80
$93.57
Should ship between 23 Aug and 30 Aug
Subject to factory lead times
The Dwyer - FSW-25 is a Flow Switch featuring Trim-to-Size, Paddle, Liquid, 43 Centistokes, SPDT, 1 ", PT, ± 1 % Accuracy, 304 SS, and Aluminum. Sold individually.
Save 15%$453.58
$386.57
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-221-SPST is a Flow Switch featuring Thermal Dispersion, Liquid, 0.04 FPS to 3 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 2 " to 12 ", NPT Male, ± 5 % Accuracy, PP, PVDF, and 10 " Wire L. Part of the FST-200 Series. Sold individually.
Save 15%$344.44
$293.54
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FSW-42A is a Flow Switch for 3 " to 10 " Pipe featuring Industrial, Liquid, 2 FPS to 15 FPS, 15 A SPDT, 1 ", NPT Male, Brass, 316 SS, Phosphor Bronze, and EPDM. Part of the FSW-40A Series. Sold individually.
Save 16%$750.50
$627.40
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FSW304 is a Flow Switch featuring Low Cost, Economical, Liquid, 3.5 GPM to 4.4 GPM, 26 VA SPST, 1 ", NPT Female, and Brass. Part of the FSW300 Series. Sold individually.
Save 15%$433.29
$369.27
Should ship between 23 Aug and 30 Aug
Subject to factory lead times
The Dwyer - FSW-41A is a Flow Switch for 1-1/2 " to 2-1/2 " Pipe featuring Industrial, Liquid, 2 FPS to 15 FPS, 15 A SPDT, 1 ", NPT Male, Brass, 316 SS, Phosphor Bronze, and EPDM. Part of the FSW-40A Series. Sold individually.
Save 16%$750.50
$627.40
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-211-SPST is a Flow Switch featuring Thermal Dispersion, Liquid, 0.04 FPS to 3 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 3/4 " to 1-1/2 ", NPT Male, ± 5 % Accuracy, PP, PVDF, and 10 " Wire L. Part of the FST-200 Series. Sold individually.
Save 15%$329.01
$280.40
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FS-100-050 is a Flow Switch for Threaded Plastic Piping featuring Liquid, 0.5 GPM Switch Point, 50 VA SPST, 3/4 ", NPT Female, ± 10 % Accuracy, PP, and 12 " (300mm) Wire L. Part of the FS-100 Series. Sold individually.
Save 15%$116.00
$98.85
Should ship between 23 Aug and 30 Aug
Subject to factory lead times
The Dwyer - FSW-160 is a Flow Switch featuring Paddle, Heavy Duty, Liquid, 4 GPM to 500 GPM, 15 A SPDT, 1 ", NPT Male, ± 1 % Accuracy, 316 SS, 304 SS, Brass, and EPDM. Sold individually.
Save 15%$257.05
$219.06
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-321-SPST is a Flow Switch featuring Thermal Dispersion, Gas, 1 FPS to 90 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 3/4 " to 1-1/2 ", NPT Male, ± 5 % Accuracy, PP, PVDF, and 10 ' Wire L. Part of the FST-320 Series. Sold individually.
Save 15%$363.08
$309.43
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FSW301 is a Flow Switch featuring Low Cost, Economical, Liquid, 4 GPM to 132 GPM, 26 VA SPST, 1/2 ", NPT Male, Brass, SS, PP, and Noryl. Part of the FSW300 Series. Sold individually.
Save 17%$375.77
$313.24
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-212-SPST is a Flow Switch featuring Thermal Dispersion, Liquid, 0.04 FPS to 3 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 3/4 " to 1-1/2 ", NPT Male, ± 5 % Accuracy, PVDF, and 10 " Wire L. Part of the FST-200 Series. Sold individually.
Save 15%$570.96
$486.60
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FS-100-025 is a Flow Switch for Threaded Plastic Piping featuring Liquid, 0.25 GPM Switch Point, 50 VA SPST, 3/4 ", NPT Female, ± 10 % Accuracy, PP, and 12 " (300mm) Wire L. Part of the FS-100 Series. Sold individually.
Save 15%$109.80
$93.57
Should ship between 23 Aug and 30 Aug
Subject to factory lead times
The Dwyer - FSW-25 is a Flow Switch featuring Trim-to-Size, Paddle, Liquid, 43 Centistokes, SPDT, 1 ", PT, ± 1 % Accuracy, 304 SS, and Aluminum. Sold individually.
Save 15%$453.58
$386.57
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-221-SPST is a Flow Switch featuring Thermal Dispersion, Liquid, 0.04 FPS to 3 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 2 " to 12 ", NPT Male, ± 5 % Accuracy, PP, PVDF, and 10 " Wire L. Part of the FST-200 Series. Sold individually.
Save 15%$344.44
$293.54
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
The Dwyer - FSW-42A is a Flow Switch for 3 " to 10 " Pipe featuring Industrial, Liquid, 2 FPS to 15 FPS, 15 A SPDT, 1 ", NPT Male, Brass, 316 SS, Phosphor Bronze, and EPDM. Part of the FSW-40A Series. Sold individually.
Save 16%$750.50
$627.40
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FSW304 is a Flow Switch featuring Low Cost, Economical, Liquid, 3.5 GPM to 4.4 GPM, 26 VA SPST, 1 ", NPT Female, and Brass. Part of the FSW300 Series. Sold individually.
Save 15%$433.29
$369.27
Should ship between 23 Aug and 30 Aug
Subject to factory lead times
The Dwyer - FSW-41A is a Flow Switch for 1-1/2 " to 2-1/2 " Pipe featuring Industrial, Liquid, 2 FPS to 15 FPS, 15 A SPDT, 1 ", NPT Male, Brass, 316 SS, Phosphor Bronze, and EPDM. Part of the FSW-40A Series. Sold individually.
Save 16%$750.50
$627.40
Should ship between 11 Aug and 14 Aug
Subject to factory lead times
The Dwyer - FST-211-SPST is a Flow Switch featuring Thermal Dispersion, Liquid, 0.04 FPS to 3 FPS, 1 A SPST Relay, N.O/N.C, Selectable, 3/4 " to 1-1/2 ", NPT Male, ± 5 % Accuracy, PP, PVDF, and 10 " Wire L. Part of the FST-200 Series. Sold individually.
Save 15%$329.01
$280.40
Should ship between 13 Sep and 20 Sep
Subject to factory lead times
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About NISCO Inc.
NISCO offers a wide range of pressure gauges & instruments, diaphragm seals, thermometers, valves, and flow control products to the industrial and commercial marketplaces, as well as other resellers like ourselves. We can also provide other value-added services such as gauge repair, NIST traceable calibration, diaphragm seal assembly, and valve automation. NISCO takes pride in providing extensive product knowledge, helpful customer service, and market competitive pricing to help fit whatever need you may have because it is our goal to be regarded by our customers as the best supplier of pressure, temperature, and flow control products.