Flow Switches

We offer highly reliable flow switches that have been engineered to specifically monitor the presence or absence of liquid, gas, or air flow in a system. Our liquid flow switches are available in vane-operated, piston, and mechanically actuated designs. We have the instruments to protect pumps, motors and equipment from the effects of low or no flow conditions. Our compact flow switch models come in piston designs to deliver proven performance in air and pure water applications. Vane flow switches are available at Transcat with field adjustability, providing count-on protection against flow variation or the stoppage of fluids, gases and flowing solids. You’ll also find brass flow switches designed to manage high inline pressure. Our switch selection includes explosion-proof products from Dwyer Instruments that have proven their worth in pipelines.

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  1. Kobold Instruments LPS-1100P
    Kobold Instruments LPS-1100P Air Flow Switch
    Order #: LPS-1100P
    Mfg #: LPS-1100P
    Availability: In stock
    Special Price $146.00 Regular Price $162.00
    Air Flow Switch Learn More
  2. Dwyer AFS-252 Flow switch, gases, 1/2" NPT conduit
    Dwyer Instruments AFS-252 Flw swtch, gases, 1/2" NPT cond conn, brss pstn, brss hsng
    Order #: AFS-252
    Mfg #: AFS-252
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swtch, gases, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
  3. Dwyer AFS-251 Flow switch, gases, 18 AWG, 24"
    Dwyer Instruments AFS-251 Flw swtch, gases, 18 AWG, 24" polymeri, brss pstn brss hsng
    Order #: AFS-251
    Mfg #: AFS-251
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swtch, gases, 18 AWG, 24" polymeri, brss pstn brss hsng Learn More
  4. Dwyer AFS-232 Flow switch, gases, 1/2" NPT conduit
    Dwyer Instruments AFS-232 Adjustable Flow Switch for Gases,1/2"NPT Conduit Conn.
    Order #: AFS-232
    Mfg #: AFS-232
    Availability: Item ships in about Ships in 2-3 weeks
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    Adjustable Flow Switch for Gases,1/2"NPT Conduit Conn. Learn More
  5. Dwyer AFS-231 Flow switch, gases, 18 AWG, 24"
    Dwyer Instruments AFS-231 Flw swtch, gases, 18 AWG, 24" polymeri, brss pstn, brss hsng
    Order #: AFS-231
    Mfg #: AFS-231
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swtch, gases, 18 AWG, 24" polymeri, brss pstn, brss hsng Learn More
  6. Dwyer AFS-152 Flow switch, liquid, 1/2" NPT conduit
    Dwyer Instruments AFS-152 Flw swch, liq, 1/2" NPT cond conn, brss pstn, brss hsng
    Order #: AFS-152
    Mfg #: AFS-152
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swch, liq, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
  7. Dwyer AFS-151 Flow switch, liquid, 18 AWG, 24"
    Dwyer Instruments AFS-151 Flw swtch, liq, 18 AWG, 24" polymer, brss pstn, brss hsng
    Order #: AFS-151
    Mfg #: AFS-151
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swtch, liq, 18 AWG, 24" polymer, brss pstn, brss hsng Learn More
  8. Dwyer AFS-142 Flow switch, water, 1/2" NPT conduit
    Dwyer Instruments AFS-142 Flw swch, wtr, 1/2" NPT cond conn, polysulf pstn, brss hsng
    Order #: AFS-142
    Mfg #: AFS-142
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swch, wtr, 1/2" NPT cond conn, polysulf pstn, brss hsng Learn More
  9. Dwyer AFS-141 Flow switch, water, 18 AWG, 24" polymeric
    Dwyer Instruments AFS-141 Flw swch, wtr, 18 AWG, 24" poly lead, polysulf pist, brss hsng
    Order #: AFS-141
    Mfg #: AFS-141
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swch, wtr, 18 AWG, 24" poly lead, polysulf pist, brss hsng Learn More
  10. Dwyer AFS-132 Flow switch, oil, 1/2" NPT conduit
    Dwyer Instruments AFS-132 Flw swtch, oil, 1/2" NPT cond conn, brss pstn, brss hsng
    Order #: AFS-132
    Mfg #: AFS-132
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swtch, oil, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
  11. Dwyer AFS-131 Flow switch, oil, 18 AWG, 24" polymeric
    Dwyer Instruments AFS-131 Flw swch, oil, 18 AWG, 24" poly lead, brss pstn, brss hsng
    Order #: AFS-131
    Mfg #: AFS-131
    Availability: Item ships in about Ships in 2-3 weeks
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    Flw swch, oil, 18 AWG, 24" poly lead, brss pstn, brss hsng Learn More
  12. Dwyer Instruments TSP220S
    Dwyer Instruments TSP220S TSP Liquid Flow Controller 2.1" sensor, flash alarm
    Order #: TSP220S
    Mfg #: TSP220S
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller 2.1" sensor, flash alarm Learn More
  13. Dwyer Instruments TSP220
    Dwyer Instruments TSP220 TSP Liquid Flow Controller 2.1" (5.3 cm) sensor
    Order #: TSP220
    Mfg #: TSP220
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller 2.1" (5.3 cm) sensor Learn More
  14. Dwyer Instruments TSP210S
    Dwyer Instruments TSP210S TSP Liquid Flow Controller .7" sensor, flash alarm
    Order #: TSP210S
    Mfg #: TSP210S
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller .7" sensor, flash alarm Learn More
  15. Dwyer Instruments TSP210
    Dwyer Instruments TSP210 TSP Liquid Flow Controller .7" (1.8 cm) sensor
    Order #: TSP210
    Mfg #: TSP210
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller .7" (1.8 cm) sensor Learn More
  16. Dwyer Instruments TSP120S
    Dwyer Instruments TSP120S TSP Liquid Flow Controller 2.1" sensor, flash alarm
    Order #: TSP120S
    Mfg #: TSP120S
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller 2.1" sensor, flash alarm Learn More
  17. Dwyer Instruments TSP120
    Dwyer Instruments TSP120 TSP Liquid Flow Controller 2.1" (5.3 cm) sensor
    Order #: TSP120
    Mfg #: TSP120
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller 2.1" (5.3 cm) sensor Learn More
  18. Dwyer Instruments TSP110S
    Dwyer Instruments TSP110S TSP Liquid Flow Controller .7" sensor, flash alarm
    Order #: TSP110S
    Mfg #: TSP110S
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller .7" sensor, flash alarm Learn More
  19. Dwyer Instruments TSP110
    Dwyer Instruments TSP110 TSP Liquid Flow Controller .7" (1.8 cm) sensor
    Order #: TSP110
    Mfg #: TSP110
    Availability: Item ships in about Ships in 2-3 weeks
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    TSP Liquid Flow Controller .7" (1.8 cm) sensor Learn More
  20. Dwyer Instruments TDS222
    Dwyer Instruments TDS222 Thermal Dispersion Flow Switch PVDF wetted parts, 4.5" length
    Order #: TDS222
    Mfg #: TDS222
    Availability: Item ships in about Ships in 2-3 weeks
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    Thermal Dispersion Flow Switch PVDF wetted parts, 4.5" length Learn More
  21. Dwyer Instruments TDS212
    Dwyer Instruments TDS212 Thermal Dispersion Flow Switch PVDF wetted parts, 3.0" length
    Order #: TDS212
    Mfg #: TDS212
    Availability: Item ships in about Ships in 2-3 weeks
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    Thermal Dispersion Flow Switch PVDF wetted parts, 3.0" length Learn More
  22. Dwyer Instruments TDS122
    Dwyer Instruments TDS122 Thermal Dispersion Flow Switch PP/PPS wetted parts 4.5" length
    Order #: TDS122
    Mfg #: TDS122
    Availability: Item ships in about Ships in 2-3 weeks
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    Thermal Dispersion Flow Switch PP/PPS wetted parts 4.5" length Learn More
  23. Dwyer Instruments TDS112
    Dwyer Instruments TDS112 Thermal Dispersion Flow Switch PP/PPS wetted parts 3.0" length
    Order #: TDS112
    Mfg #: TDS112
    Availability: Item ships in about Ships in 2-3 weeks
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    Thermal Dispersion Flow Switch PP/PPS wetted parts 3.0" length Learn More
  24. Dwyer G9-23
    Dwyer Instruments G9-23 Globe Flow Switch actuation set point 7.0-14 GPM
    Order #: G9-23
    Mfg #: G9-23
    Availability: Item ships in about Ships in 2-3 weeks
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    Globe Flow Switch actuation set point 7.0-14 GPM Learn More
  25. Dwyer G9-22
    Dwyer Instruments G9-22 Globe Flow Switch actuation set point 2.0-8 GPM
    Order #: G9-22
    Mfg #: G9-22
    Availability: Item ships in about Ships in 2-3 weeks
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    Globe Flow Switch actuation set point 2.0-8 GPM Learn More
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