Flow Switches
Flow switches are vital instruments in fluid systems that detect the presence or absence of flow. These devices ensure proper operation and prevent issues such as pump damage or system failure. Flow switches are employed in various industries to monitor and control the flow of liquids or gases, providing a reliable means of safeguarding equipment and optimizing fluid processes.
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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.
$98.85
Should ship between 14 Jul and 21 Jul
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.
$219.06
Should ship between 02 Jul and 05 Jul
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.
$309.43
Should ship between 04 Aug and 11 Aug
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.
$313.24
Should ship between 02 Jul and 05 Jul
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.
$486.60
Should ship between 04 Aug and 11 Aug
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.
$93.57
Should ship between 14 Jul and 21 Jul
Subject to factory lead times
Configure product to see pricing
The versatile KOBOLD KSM Plastic Flowmeter delivers reliable flow measurement for aggressive chemicals and corrosive substances with its all-plastic construction featuring no metal components in the fluid path. Available with either durable Polysulfone (for highly corrosive applications) or Trogamid® measuring tubes (for moderately aggressive media), this variable area flowmeter provides ±4% full scale accuracy while withstanding pressures up to 145 PSI and temperatures to 140°F. The device's highly visible red PVDF float and large dual-scale display show both direct flow readings (GPM/SCFM) and percentage values, making monitoring simple across a wide measurement range from 0.06 to 264 GPM for liquids or 0.5 to 400 SCFM for gases. Optional bistable reed contact switches with IP65 protection can be easily added for automated flow control and alarm functionality, with convenient field-adjustable markers ensuring precise setpoint positioning. Featuring robust PVC connections (available in glue socket or NPT threaded options) and chemical-resistant EPDM seals, this shock-resistant instrument provides reliable service in water treatment, chemical processing, laboratory, and other demanding environments where metal flowmeters would quickly deteriorate.
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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.
$386.57
Should ship between 02 Jul and 05 Jul
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.
$293.54
Should ship between 04 Aug and 11 Aug
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.
$627.40
Should ship between 02 Jul and 05 Jul
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.
$369.27
Should ship between 14 Jul and 21 Jul
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.
$627.40
Should ship between 02 Jul and 05 Jul
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.
$98.85
Should ship between 14 Jul and 21 Jul
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.
$219.06
Should ship between 02 Jul and 05 Jul
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.
$309.43
Should ship between 04 Aug and 11 Aug
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.
$313.24
Should ship between 02 Jul and 05 Jul
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.
$486.60
Should ship between 04 Aug and 11 Aug
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.
$93.57
Should ship between 14 Jul and 21 Jul
Subject to factory lead times
Configure product to see pricing
The versatile KOBOLD KSM Plastic Flowmeter delivers reliable flow measurement for aggressive chemicals and corrosive substances with its all-plastic construction featuring no metal components in the fluid path. Available with either durable Polysulfone (for highly corrosive applications) or Trogamid® measuring tubes (for moderately aggressive media), this variable area flowmeter provides ±4% full scale accuracy while withstanding pressures up to 145 PSI and temperatures to 140°F. The device's highly visible red PVDF float and large dual-scale display show both direct flow readings (GPM/SCFM) and percentage values, making monitoring simple across a wide measurement range from 0.06 to 264 GPM for liquids or 0.5 to 400 SCFM for gases. Optional bistable reed contact switches with IP65 protection can be easily added for automated flow control and alarm functionality, with convenient field-adjustable markers ensuring precise setpoint positioning. Featuring robust PVC connections (available in glue socket or NPT threaded options) and chemical-resistant EPDM seals, this shock-resistant instrument provides reliable service in water treatment, chemical processing, laboratory, and other demanding environments where metal flowmeters would quickly deteriorate.
Configure Product
Configure product to see pricing
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.
$386.57
Should ship between 02 Jul and 05 Jul
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.
$293.54
Should ship between 04 Aug and 11 Aug
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.
$627.40
Should ship between 02 Jul and 05 Jul
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.
$369.27
Should ship between 14 Jul and 21 Jul
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.
$627.40
Should ship between 02 Jul and 05 Jul
Subject to factory lead times