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. Dwyer Instruments V6EPS-S-S-4-S
    Dwyer Instruments V6EPS-S-S-4-S Flotect Mini-Size Flow Switch SST upper and lower body
    Order #: V6EPS-S-S-4-S
    Mfg #: V6EPS-S-S-4-S
    Availability: Ships in 3-4 weeks
    $819.38
    Flotect Mini-Size Flow Switch SST upper and lower body Learn More
  2. 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: Ships in 3-4 weeks
    Call for price
    Flw swch, wtr, 1/2" NPT cond conn, polysulf pstn, brss hsng Learn More
  3. Dwyer Instruments V6EPS-S-S-3-S
    Dwyer Instruments V6EPS-S-S-3-S Flotect Mini-Size Flow Switch SST upper and lower body
    Order #: V6EPS-S-S-3-S
    Mfg #: V6EPS-S-S-3-S
    Availability: Ships in 3-4 weeks
    $618.13
    Flotect Mini-Size Flow Switch SST upper and lower body Learn More
  4. Dwyer Instruments V4-SS-2-D-U
    Dwyer Instruments V4-SS-2-D-U Flotect Vane-Operated Flow SW 316SS body, universal vane
    Order #: V4-SS-2-D-U
    Mfg #: V4-SS-2-D-U
    Availability: Ships in 3-4 weeks
    $1,084.07
    Flotect Vane-Operated Flow SW 316SS body, universal vane Learn More
  5. Kobold Instruments LPS-1100P
    Kobold Instruments LPS-1100P Air Flow Switch
    Order #: LPS-1100P
    Mfg #: LPS-1100P
    Availability: Ships in 2-3 weeks
    Special Price $193.18 Regular Price $214.65
    Air Flow Switch Learn More
  6. Dwyer Instruments P2-15
    Dwyer Instruments P2-15 Series P2 Flow Switch Actuation set point .42 CFM
    Order #: P2-15
    Mfg #: P2-15
    Availability: Ships in 3-4 weeks
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    Series P2 Flow Switch Actuation set point .42 CFM Learn More
  7. Dwyer Instruments V10
    Dwyer Instruments V10 Flotect Mini-Size Flow Switch Brass, normally open or closed
    Order #: V10
    Mfg #: V10
    Availability: Ships in 3-4 weeks
    $99.38
    Flotect Mini-Size Flow Switch Brass, normally open or closed Learn More
  8. Dwyer Instruments V6EPB-B-D-1-B
    Dwyer Instruments V6EPB-B-D-1-B Flotect Mini-Size Flow Switch Brass upper and lower body
    Order #: V6EPB-B-D-1-B
    Mfg #: V6EPB-B-D-1-B
    Availability: Ships in 3-4 weeks
    $391.25
    Flotect Mini-Size Flow Switch Brass upper and lower body Learn More
  9. Dwyer Instruments V6EPB-B-S-6-B
    Dwyer Instruments V6EPB-B-S-6-B Flotect Mini-Size Flow Switch Brass upper and lower body
    Order #: V6EPB-B-S-6-B
    Mfg #: V6EPB-B-S-6-B
    Availability: Ships in 3-4 weeks
    $645.00
    Flotect Mini-Size Flow Switch Brass upper and lower body Learn More
  10. Dwyer Instruments V6EPB-B-D-4-B
    Dwyer Instruments V6EPB-B-D-4-B Flotect Mini-Size Flow Switch Brass upper and lower body
    Order #: V6EPB-B-D-4-B
    Mfg #: V6EPB-B-D-4-B
    Availability: Ships in 3-4 weeks
    $507.50
    Flotect Mini-Size Flow Switch Brass upper and lower body Learn More
  11. Dwyer Instruments V6EPB-B-S-2-B
    Dwyer Instruments V6EPB-B-S-2-B Flotect Mini-Size Flow Switch Brass upper and lower body
    Order #: V6EPB-B-S-2-B
    Mfg #: V6EPB-B-S-2-B
    Availability: Ships in 3-4 weeks
    $330.32
    Flotect Mini-Size Flow Switch Brass upper and lower body Learn More
  12. Dwyer Instruments V6EPB-B-S-1-B
    Dwyer Instruments V6EPB-B-S-1-B Flotect Mini-Size Flow Switch Brass upper and lower body
    Order #: V6EPB-B-S-1-B
    Mfg #: V6EPB-B-S-1-B
    Availability: Ships in 3-4 weeks
    $316.25
    Flotect Mini-Size Flow Switch Brass upper and lower body Learn More
  13. Dwyer Instruments V10SS
    Dwyer Instruments V10SS Flotect Mini-Size Flow Switch 303 SS, normally open or closed
    Order #: V10SS
    Mfg #: V10SS
    Availability: Ships in 3-4 weeks
    $152.50
    Flotect Mini-Size Flow Switch 303 SS, normally open or closed Learn More
  14. New
    Dwyer Instruments V4 Vane Operated Flow Switch,Brass Universal Vane,Vert.Up-flow
    Dwyer Instruments V4 Vane Operated Flow Switch,Brass Universal Vane,Vert.Up-flow
    Order #: V4-2-U-V
    Mfg #: V4-2-U-V
    Availability: Ships in 2-3 Weeks
    $412.06
    Vane Operated Flow Switch,Brass Universal Vane,Vert.Up-flow Learn More
  15. 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: Ships in 3-4 weeks
    Call for price
    Flw swtch, gases, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
  16. 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: Ships in 3-4 weeks
    Call for price
    Flw swtch, gases, 18 AWG, 24" polymeri, brss pstn brss hsng Learn More
  17. 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: Ships in 3-4 weeks
    Call for price
    Adjustable Flow Switch for Gases,1/2"NPT Conduit Conn. Learn More
  18. 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: Ships in 3-4 weeks
    Call for price
    Flw swtch, gases, 18 AWG, 24" polymeri, brss pstn, brss hsng Learn More
  19. 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: Ships in 3-4 weeks
    Call for price
    Flw swch, liq, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
  20. 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: Ships in 3-4 weeks
    Call for price
    Flw swtch, liq, 18 AWG, 24" polymer, brss pstn, brss hsng Learn More
  21. 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: Ships in 3-4 weeks
    Call for price
    Flw swch, wtr, 18 AWG, 24" poly lead, polysulf pist, brss hsng Learn More
  22. 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: Ships in 3-4 weeks
    Call for price
    Flw swtch, oil, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
  23. 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: Ships in 3-4 weeks
    Call for price
    Flw swch, oil, 18 AWG, 24" poly lead, brss pstn, brss hsng Learn More
  24. Dwyer Instruments TSP220S
    Dwyer Instruments TSP220S TSP Liquid Flow Controller 2.1" sensor, flash alarm
    Order #: TSP220S
    Mfg #: TSP220S
    Availability: Ships in 2-3 weeks
    Call for price
    TSP Liquid Flow Controller 2.1" sensor, flash alarm Learn More
  25. Dwyer Instruments TSP220
    Dwyer Instruments TSP220 TSP Liquid Flow Controller 2.1" (5.3 cm) sensor
    Order #: TSP220
    Mfg #: TSP220
    Availability: Ships in 2-3 weeks
    Call for price
    TSP Liquid Flow Controller 2.1" (5.3 cm) sensor Learn More
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