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: Item ships in about 3 - 4 Weeks
    Special Price $193.91 Regular Price $287.28
    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 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 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 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 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 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 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 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 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 2 - 3 Weeks
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    Flw swtch, oil, 1/2" NPT cond conn, brss pstn, brss hsng Learn More
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