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Flow Switches

  • FS251, General Purpose Flow Switch w/ NEMA 1 Encl. Product Image
    FS251, General Purpose Flow Switch w/ NEMA 1 Encl.
    SKU: 120611
    Brand: Mcdonnell & Miller
    (12)
    $97.95 each
    $284.85 box of 3
    $94.95 each
    218
    Fri, Aug 30
    218
    QtyArrives
    218 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • FS4-3, 1" General Purpose Flow Switch - Paddle Style Product Image
    FS4-3, 1" General Purpose Flow Switch - Paddle Style
    SKU: 114400
    Brand: Mcdonnell & Miller
    (4)
    $115.95 each
    $335.85 box of 3
    $111.95 each
    536
    Fri, Aug 30
    536
    QtyArrives
    536 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) Product Image
    $168.95 each
    $488.85 box of 3
    $162.95 each
    115
    Fri, Aug 30
    115
    QtyArrives
    115 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • 1" Liquid Flow Switch<br>(Set of 4 Paddles) Product Image
    1" Liquid Flow Switch (Set of 4 Paddles)
    SKU: F261KAH-V01C
    Brand: Johnson Controls
    $105.95 each
    $299.85 box of 3
    $99.95 each
    159
    Fri, Aug 30
    159
    QtyArrives
    159 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • Brass Flow Switch w/ Flexible Paddles<br>(Single Switch) Product Image
    $131.95 each
    $380.85 box of 3
    $126.95 each
    51
    Fri, Aug 30
    73
    QtyArrives
    51 Fri, Aug 30
    22 Wed, Sep 4 – Thu, Sep 5
    Questions? Call 1-888-757-4774
  • 1" NPT Flow Switch<br>(SS Paddles) Product Image
    1" NPT Flow Switch (SS Paddles)
    SKU: F261MAH-V01C
    Brand: Johnson Controls
    (3)
    $149.95 each
    $431.85 box of 3
    $143.95 each
    42
    Fri, Aug 30
    42
    QtyArrives
    42 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • Air Flow Pressure Sensing Switch (.1/10"W.C.) Product Image
    Air Flow Pressure Sensing Switch (.1/10"W.C.)
    SKU: NS2-0000-00
    Brand: Cleveland Controls
    (1)
    $21.15 each
    63
    Fri, Aug 30
    63
    QtyArrives
    63 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • SPDT Adj. Differential<br>Air Pressure Switch<br>(.05"-12.0" W.C.) Product Image
    SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.)
    SKU: AFS-222-112
    Brand: Cleveland Controls
    (4)
    $28.95 each
    17
    Fri, Aug 30
    17
    QtyArrives
    17 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • OEM Pressure Sensing Switch (.25/1.0" W.C.) Product Image
    OEM Pressure Sensing Switch (.25/1.0" W.C.)
    SKU: RSS-495-011
    Brand: Cleveland Controls
    (4)
    $24.95 each
    46
    Fri, Aug 30
    46
    QtyArrives
    46 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey) Product Image
    $55.95 each
    531
    Fri, Aug 30
    531
    QtyArrives
    531 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • FS1, 1/2" Flow Switch Product Image
    FS1, 1/2" Flow Switch
    SKU: 113200
    Brand: Mcdonnell & Miller
    (3)
    $179.95 each
    $518.85 box of 3
    $172.95 each
    74
    Fri, Aug 30
    74
    QtyArrives
    74 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue) Product Image
    JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue)
    SKU: JD-2-BLUE
    Brand: Antunes
    (1)
    $62.95 each
    614
    Fri, Aug 30
    614
    QtyArrives
    614 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • FS5-3/4, 3/4" Flow Switch Product Image
    FS5-3/4, 3/4" Flow Switch
    SKU: 114760
    Brand: Mcdonnell & Miller
    (3)
    $192.95 each
    $557.85 box of 3
    $185.95 each
    40
    Fri, Aug 30
    40
    QtyArrives
    40 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • Pressure Switch .05" WC Product Image
    Pressure Switch .05" WC
    SKU: DFS-221-347
    Brand: Cleveland Controls
    (1)
    $33.95 each
    14
    Fri, Aug 30
    14
    QtyArrives
    14 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • 2-1/2" NPT Liquid Level Float Switch Product Image
    2-1/2" NPT Liquid Level Float Switch
    SKU: 9037HG33
    Brand: Square D
    (2)
    $97.99 each
    76
    Fri, Aug 30
    76
    QtyArrives
    76 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • SPDT Air Pressure Sensing Switch<br>(.05" - 12.0" W.C.) Product Image
    SPDT Air Pressure Sensing Switch (.05" - 12.0" W.C.)
    SKU: AFS-A
    Brand: Cleveland Controls
    $31.95 each
    31
    Fri, Aug 30
    31
    QtyArrives
    31 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • SPDT Adj. Differential<br>Air Pressure Switch<br>(.05"-12.0" W.C.) Product Image
    SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.)
    SKU: AFS-145
    Brand: Cleveland Controls
    (1)
    $28.75 each
    51
    Fri, Aug 30
    51
    QtyArrives
    51 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • Alternator Liquid Level Switch (NEMA 1) Product Image
    Alternator Liquid Level Switch (NEMA 1)
    SKU: 9038CG36
    Brand: Square D
    $273.99 each
    27
    Fri, Aug 30
    27
    QtyArrives
    27 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • Open Liquid Level Switch, Close On Rise, NEMA 1 (460V) Product Image
    $33.99 each
    26
    Fri, Aug 30
    26
    QtyArrives
    26 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • SPDT Air Pressure Switch Barbed Connector<br>(.05" W.C.) Product Image
    SPDT Air Pressure Switch Barbed Connector (.05" W.C.)
    SKU: DFS-221-112
    Brand: Cleveland Controls
    $22.95 each
    28
    Fri, Aug 30
    28
    QtyArrives
    28 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • FS5-1, 1" Flow Switch Product Image
    FS5-1, 1" Flow Switch
    SKU: 114780
    Brand: Mcdonnell & Miller
    (5)
    $192.95 each
    $557.85 box of 3
    $185.95 each
    11
    Fri, Aug 30
    11
    QtyArrives
    11 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • Brass Flow Switch NEMA4 Flexible w/ Paddles<br>(Small Turning Radius) Product Image
    $166.95 each
    21
    Fri, Aug 30
    30
    QtyArrives
    21 Fri, Aug 30
    9 Wed, Sep 4 – Thu, Sep 5
    Questions? Call 1-888-757-4774
  • FS-200-W NEMA-1 Paddle-Type Flow Switch Product Image
    $199.99 each
    $383.38 box of 2
    $191.69 each
    26
    Fri, Aug 30
    26
    QtyArrives
    26 Fri, Aug 30
    Questions? Call 1-888-757-4774
  • SPDT General Purpose<br>Air Sensing Switch<br>(.05" to 12.0" W.C.) Product Image
    SPDT General Purpose Air Sensing Switch (.05" to 12.0" W.C.)
    SKU: AFS-222-121
    Brand: Cleveland Controls
    (1)
    $29.95 each
    65
    Fri, Aug 30
    65
    QtyArrives
    65 Fri, Aug 30
    Questions? Call 1-888-757-4774

Resources

Articles

  • A flow switch is an instrument that monitors the flow of steam, air, or liquid. The flow switch sends a signal to a device, such as a pump, to turn on or shut off. Flow switches can be used for air conditioning, heating and hydronic systems, among other applications.

    Air flow switches are used in applications that require low to high velocity, providing an economical way to detect change or loss of air flow velocity. This change or loss may be caused by a closed damper or fan inlet, loose fan wheel, slipped or broken fan belt, dirty or clogged filter, or an overload on a fan motor switch.

    Liquid flow switches have a universal design and serve a wider range of applications, such as starting or stopping electrically operated equipment like signal lights, alarms, motors, and automatic burners. In addition, liquid flow switches are used for general purpose applications with environmental exposure or applications requiring a water-tight or dust-tight flow switch. The liquid-flow F61 Series flow switch, manufactured by Johnson Controls, responds to fluid flow in lines carrying water, ethylene glycol, or other nonhazardous fluids. It also responds to low fluid flow rates in applications with pipe sizes under 1" trade size.

    Our website offers a vast selection of McDonnell & Miller Johnson Controls, Watts. and Taco flow switches that suit a wide range of residential, commercial, and industrial applications.
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