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 P4-15
    Dwyer Instruments P4-15 P4 PPS Piston Flow Switch Actuation set point 1 GPM
    Order #: P4-15
    Mfg #: P4-15
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    P4 PPS Piston Flow Switch Actuation set point 1 GPM Learn More
  2. Dwyer Instruments P4-14
    Dwyer Instruments P4-14 P4 PPS Piston Flow Switch Actuation set point .75 GPM
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    Mfg #: P4-14
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    P4 PPS Piston Flow Switch Actuation set point .75 GPM Learn More
  3. Dwyer Instruments P4-13
    Dwyer Instruments P4-13 P4 PPS Piston Flow Switch Actuation set point .5 GPM
    Order #: P4-13
    Mfg #: P4-13
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    P4 PPS Piston Flow Switch Actuation set point .5 GPM Learn More
  4. Dwyer Instruments P4-12
    Dwyer Instruments P4-12 P4 PPS Piston Flow Switch Actuation set point .25 GPM
    Order #: P4-12
    Mfg #: P4-12
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    P4 PPS Piston Flow Switch Actuation set point .25 GPM Learn More
  5. Dwyer Instruments P4-11
    Dwyer Instruments P4-11 P4 PPS Piston Flow Switch Actuation set point .1 GPM
    Order #: P4-11
    Mfg #: P4-11
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    P4 PPS Piston Flow Switch Actuation set point .1 GPM Learn More
  6. Dwyer Instruments P3-45
    Dwyer Instruments P3-45 P3 Polypropylene Flow Switch Actuation set point 2.0 GPM
    Order #: P3-45
    Mfg #: P3-45
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    P3 Polypropylene Flow Switch Actuation set point 2.0 GPM Learn More
  7. Dwyer Instruments P3-44
    Dwyer Instruments P3-44 P3 Polypropylene Flow Switch Actuation set point 1.5 GPM
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    Mfg #: P3-44
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    P3 Polypropylene Flow Switch Actuation set point 1.5 GPM Learn More
  8. Dwyer Instruments P3-43
    Dwyer Instruments P3-43 P3 Polypropylene Flow Switch Actuation set point 1.0 GPM
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    Mfg #: P3-43
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    P3 Polypropylene Flow Switch Actuation set point 1.0 GPM Learn More
  9. Dwyer Instruments P3-42
    Dwyer Instruments P3-42 P3 Polypropylene Flow Switch Actuation set point 0.50 GPM
    Order #: P3-42
    Mfg #: P3-42
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    P3 Polypropylene Flow Switch Actuation set point 0.50 GPM Learn More
  10. Dwyer Instruments P3-41
    Dwyer Instruments P3-41 P3 Polypropylene Flow Switch Actuation set point 0.25 GPM
    Order #: P3-41
    Mfg #: P3-41
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    P3 Polypropylene Flow Switch Actuation set point 0.25 GPM Learn More
  11. Dwyer Instruments P3-35
    Dwyer Instruments P3-35 P3 Polypropylene Flow Switch Actuation set point 2.0 GPM
    Order #: P3-35
    Mfg #: P3-35
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    P3 Polypropylene Flow Switch Actuation set point 2.0 GPM Learn More
  12. Dwyer Instruments P3-34
    Dwyer Instruments P3-34 P3 Polypropylene Flow Switch Actuation set point 1.5 GPM
    Order #: P3-34
    Mfg #: P3-34
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    P3 Polypropylene Flow Switch Actuation set point 1.5 GPM Learn More
  13. Dwyer Instruments P3-33
    Dwyer Instruments P3-33 P3 Polypropylene Flow Switch Actuation set point 1.0 GPM
    Order #: P3-33
    Mfg #: P3-33
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    P3 Polypropylene Flow Switch Actuation set point 1.0 GPM Learn More
  14. Dwyer Instruments P3-32
    Dwyer Instruments P3-32 P3 Polypropylene Flow Switch Actuation set point 0.50 GPM
    Order #: P3-32
    Mfg #: P3-32
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    P3 Polypropylene Flow Switch Actuation set point 0.50 GPM Learn More
  15. Dwyer Instruments P3-31
    Dwyer Instruments P3-31 P3 Polypropylene Flow Switch Actuation set point 0.25 GPM
    Order #: P3-31
    Mfg #: P3-31
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    P3 Polypropylene Flow Switch Actuation set point 0.25 GPM Learn More
  16. Dwyer Instruments P2-18
    Dwyer Instruments P2-18 Series P2 Flow Switch Actuation set point 5 CFM
    Order #: P2-18
    Mfg #: P2-18
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    Series P2 Flow Switch Actuation set point 5 CFM Learn More
  17. Dwyer Instruments P2-17
    Dwyer Instruments P2-17 Series P2 Flow Switch Actuation set point 2.5 CFM
    Order #: P2-17
    Mfg #: P2-17
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    Series P2 Flow Switch Actuation set point 2.5 CFM Learn More
  18. Dwyer Instruments P2-16
    Dwyer Instruments P2-16 Series P2 Flow Switch Actuation set point 1 CFM
    Order #: P2-16
    Mfg #: P2-16
    Availability: Item ships in about Ships in 1-2 weeks
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    Series P2 Flow Switch Actuation set point 1 CFM Learn More
  19. Dwyer Instruments P2-15
    Dwyer Instruments P2-15 Series P2 Flow Switch Actuation set point .42 CFM
    Order #: P2-15
    Mfg #: P2-15
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    Series P2 Flow Switch Actuation set point .42 CFM Learn More
  20. Dwyer Instruments P2-14
    Dwyer Instruments P2-14 Series P2 Flow Switch Actuation set point 1 GPM
    Order #: P2-14
    Mfg #: P2-14
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    Series P2 Flow Switch Actuation set point 1 GPM Learn More
  21. Dwyer Instruments P2-13
    Dwyer Instruments P2-13 Series P2 Flow Switch Actuation set point .5 GPM
    Order #: P2-13
    Mfg #: P2-13
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    Series P2 Flow Switch Actuation set point .5 GPM Learn More
  22. Dwyer Instruments P2-12
    Dwyer Instruments P2-12 Series P2 Flow Switch Actuation set point .25 GPM
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    Series P2 Flow Switch Actuation set point .25 GPM Learn More
  23. Dwyer Instruments P2-11
    Dwyer Instruments P2-11 Series P2 Flow Switch Actuation set point .05 GPM
    Order #: P2-11
    Mfg #: P2-11
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    Series P2 Flow Switch Actuation set point .05 GPM Learn More
  24. Dwyer P1-016
    Dwyer Instruments P1-016 Series P1 Brass Flow Switch Actuation set point 1.50 GPM
    Order #: P1-016
    Mfg #: P1-016
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    Series P1 Brass Flow Switch Actuation set point 1.50 GPM Learn More
  25. Dwyer P1-015
    Dwyer Instruments P1-015 Series P1 Brass Flow Switch Actuation set point 1.00 GPM
    Order #: P1-015
    Mfg #: P1-015
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    Series P1 Brass Flow Switch Actuation set point 1.00 GPM Learn More
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