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Flow Switches

  • FS251, General Purpose Flow Switch w/ NEMA 1 Encl. Product Image
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    FS251, General Purpose Flow Switch w/ NEMA 1 Encl. 120611 FS251, General Purpose Flow Switch w/ NEMA 1 Encl.
    SKU: 120611
    Brand: Mcdonnell & Miller
    (13)
    $97.95 each
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    $284.85 box of 3
    $94.95 each
    426
    Thu, Dec 26
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    426 Thu, Dec 26
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  • FS4-3, 1" General Purpose Flow Switch - Paddle Style Product Image
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    FS4-3, 1" General Purpose Flow Switch - Paddle Style 114400 FS4-3, 1" General Purpose Flow Switch - Paddle Style
    SKU: 114400
    Brand: Mcdonnell & Miller
    (4)
    $115.95 each
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    $335.85 box of 3
    $111.95 each
    876
    Thu, Dec 26
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    876 Thu, Dec 26
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  • FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) Product Image
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    FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W) 120610 FS254, General Purpose Flow Switch w/ NEMA 4 Encl. (Replaces FS8-W)
    SKU: 120610
    Brand: Mcdonnell & Miller
    (6)
    $168.95 each
      Box Up & Save 4%  
    $488.85 box of 3
    $162.95 each
    157
    Thu, Dec 26
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    157 Thu, Dec 26
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  • 1" Liquid Flow Switch<br>(Set of 4 Paddles) Product Image
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    1" Liquid Flow Switch (Set of 4 Paddles) F261KAH-V01C 1" Liquid Flow Switch (Set of 4 Paddles)
    SKU: F261KAH-V01C
    Brand: Johnson Controls
    $112.99 each
      Box Up & Save 4%  
    $325.77 box of 3
    $108.59 each
    127
    Thu, Dec 26
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    127 Thu, Dec 26
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  • Brass Flow Switch w/ Flexible Paddles<br>(Single Switch) Product Image
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    Brass Flow Switch w/ Flexible Paddles (Single Switch) IFS01BF-1 Brass Flow Switch w/ Flexible Paddles (Single Switch)
    SKU: IFS01BF-1
    Brand: Taco
    (4)
    $109.99 each
      Box Up & Save 4%  
    $317.37 box of 3
    $105.79 each
    15
    Thu, Dec 26
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    15 Thu, Dec 26
    13 Fri, Dec 27 – Mon, Dec 30
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  • OEM Pressure Sensing Switch (.25/1.0" W.C.) Product Image
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    OEM Pressure Sensing Switch (.25/1.0" W.C.) RSS-495-011 OEM Pressure Sensing Switch (.25/1.0" W.C.)
    SKU: RSS-495-011
    Brand: Cleveland Controls
    (4)
    $23.99 each
    262
    Thu, Dec 26
    262
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    262 Thu, Dec 26
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  • 1" NPT Flow Switch<br>(SS Paddles) Product Image
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    1" NPT Flow Switch (SS Paddles) F261MAH-V01C 1" NPT Flow Switch (SS Paddles)
    SKU: F261MAH-V01C
    Brand: Johnson Controls
    (3)
    $154.99 each
      Box Up & Save 4%  
    $446.37 box of 3
    $148.79 each
    66
    Thu, Dec 26
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    66 Thu, Dec 26
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  • Air Flow Pressure Sensing Switch (.1/10"W.C.) Product Image
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    Air Flow Pressure Sensing Switch (.1/10"W.C.) NS2-0000-00 Air Flow Pressure Sensing Switch (.1/10"W.C.)
    SKU: NS2-0000-00
    Brand: Cleveland Controls
    (1)
    $19.99 each
    121
    Thu, Dec 26
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    121 Thu, Dec 26
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  • JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey) Product Image
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    JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey) JD-2-GREY JD-2 Vacuum/Pressure Switch w/ Auto Reset Air Differential, 1-4" W.C. (Grey)
    SKU: JD-2-GREY
    Brand: Antunes
    $58.49 each
    189
    Thu, Dec 26
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    189 Thu, Dec 26
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  • SPDT Adj. Differential<br>Air Pressure Switch<br>(.05"-12.0" W.C.) Product Image
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    SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.) AFS-222-112 SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.)
    SKU: AFS-222-112
    Brand: Cleveland Controls
    (4)
    $29.19 each
    101
    Thu, Dec 26
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    101 Thu, Dec 26
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  • Pressure Switch .05" WC Product Image
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    Pressure Switch .05" WC DFS-221-347 Pressure Switch .05" WC
    SKU: DFS-221-347
    Brand: Cleveland Controls
    (1)
    $32.49 each
    41
    Thu, Dec 26
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    41 Thu, Dec 26
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  • JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue) Product Image
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    JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue) JD-2-BLUE JD-2 Air Pressure Switch, .07 to 1.7" W.C. (Blue)
    SKU: JD-2-BLUE
    Brand: Antunes
    (1)
    $66.99 each
    420
    Thu, Dec 26
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    420 Thu, Dec 26
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  • FS1, 1/2" Flow Switch Product Image
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    FS1, 1/2" Flow Switch 113200 FS1, 1/2" Flow Switch
    SKU: 113200
    Brand: Mcdonnell & Miller
    (3)
    $179.95 each
      Box Up & Save 2%  
    $530.91 box of 3
    $176.97 each
    82
    Thu, Dec 26
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    82 Thu, Dec 26
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  • FS5-3/4, 3/4" Flow Switch Product Image
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    FS5-3/4, 3/4" Flow Switch 114760 FS5-3/4, 3/4" Flow Switch
    SKU: 114760
    Brand: Mcdonnell & Miller
    (3)
    $192.95 each
      Box Up & Save 4%  
    $557.85 box of 3
    $185.95 each
    58
    Thu, Dec 26
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    58 Thu, Dec 26
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  • SPDT Air Pressure Sensing Switch<br>(.05" - 12.0" W.C.) Product Image
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    SPDT Air Pressure Sensing Switch (.05" - 12.0" W.C.) AFS-A SPDT Air Pressure Sensing Switch (.05" - 12.0" W.C.)
    SKU: AFS-A
    Brand: Cleveland Controls
    $30.99 each
    81
    Thu, Dec 26
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    81 Thu, Dec 26
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  • 2-1/2" NPT Liquid Level Float Switch Product Image
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    2-1/2" NPT Liquid Level Float Switch 9037HG33 2-1/2" NPT Liquid Level Float Switch
    SKU: 9037HG33
    Brand: Square D
    (2)
    $93.99 each
    25
    Thu, Dec 26
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    25 Thu, Dec 26
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  • FS5-1, 1" Flow Switch Product Image
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    FS5-1, 1" Flow Switch 114780 FS5-1, 1" Flow Switch
    SKU: 114780
    Brand: Mcdonnell & Miller
    (6)
    $192.95 each
      Box Up & Save 4%  
    $557.85 box of 3
    $185.95 each
    50
    Thu, Dec 26
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    50 Thu, Dec 26
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  • SPDT General Purpose<br>Air Sensing Switch<br>(.05" to 12.0" W.C.) Product Image
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    SPDT General Purpose Air Sensing Switch (.05" to 12.0" W.C.) AFS-222-121 SPDT General Purpose Air Sensing Switch (.05" to 12.0" W.C.)
    SKU: AFS-222-121
    Brand: Cleveland Controls
    (1)
    $28.69 each
    81
    Thu, Dec 26
    81
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    81 Thu, Dec 26
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  • Brass Flow Switch NEMA4 Flexible w/ Paddles<br>(Small Turning Radius) Product Image
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    Brass Flow Switch NEMA4 Flexible w/ Paddles (Small Turning Radius) IFSWSBF-1 Brass Flow Switch NEMA4 Flexible w/ Paddles (Small Turning Radius)
    SKU: IFSWSBF-1
    Brand: Taco
    (1)
    $156.99 each
    5
    Thu, Dec 26
    11
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    5 Thu, Dec 26
    6 Fri, Dec 27 – Mon, Dec 30
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  • SPDT Adj. Differential<br>Air Pressure Switch<br>(.05"-12.0" W.C.) Product Image
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    SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.) AFS-145 SPDT Adj. Differential Air Pressure Switch (.05"-12.0" W.C.)
    SKU: AFS-145
    Brand: Cleveland Controls
    (1)
    $27.59 each
    78
    Thu, Dec 26
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    78 Thu, Dec 26
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  • SPDT Air Pressure Switch Barbed Connector<br>(.05" W.C.) Product Image
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    SPDT Air Pressure Switch Barbed Connector (.05" W.C.) DFS-221-112 SPDT Air Pressure Switch Barbed Connector (.05" W.C.)
    SKU: DFS-221-112
    Brand: Cleveland Controls
    $23.19 each
    100
    Thu, Dec 26
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    100 Thu, Dec 26
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  • Air Sensing Switch Kit Product Image
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    Air Sensing Switch Kit RSS-498-13 Air Sensing Switch Kit
    SKU: RSS-498-13
    Brand: Cleveland Controls
    (1)
    $23.99 each
    77
    Thu, Dec 26
    77
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    77 Thu, Dec 26
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  • 1" Liquid Flow Switch (SS Paddles) Product Image
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    1" Liquid Flow Switch (SS Paddles) F261MAL-V01C 1" Liquid Flow Switch (SS Paddles)
    SKU: F261MAL-V01C
    Brand: Johnson Controls
    $174.99 each
      Box Up & Save 4%  
    $506.07 box of 3
    $168.69 each
    32
    Thu, Dec 26
    32
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    32 Thu, Dec 26
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  • Air Flow Pressure Sensing Switch w/ Bleed Hole (.1/10"W.C.) Product Image
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    Air Flow Pressure Sensing Switch w/ Bleed Hole (.1/10"W.C.) NS2-0000-01 Air Flow Pressure Sensing Switch w/ Bleed Hole (.1/10"W.C.)
    SKU: NS2-0000-01
    Brand: Cleveland Controls
    $19.99 each
    62
    Thu, Dec 26
    62
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    62 Thu, Dec 26
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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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