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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)
    $98.99 each
    373
    Fri, Jan 31
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    373 Fri, Jan 31
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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
    Contains Lead
    SKU: 114400
    Brand: Mcdonnell & Miller
    (4)
    $115.99 each
    982
    Fri, Jan 31
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    982 Fri, Jan 31
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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)
    $186.99 each
    167
    Fri, Jan 31
    167
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    167 Fri, Jan 31
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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
    115
    Fri, Jan 31
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    115 Fri, Jan 31
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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
    29
    Fri, Jan 31
    31
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    29 Fri, Jan 31
    2 Tue, Feb 4 – Wed, Feb 5
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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
    290
    Fri, Jan 31
    290
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    290 Fri, Jan 31
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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
    54
    Fri, Jan 31
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    54 Fri, Jan 31
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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
    89
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    89 Fri, Jan 31
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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
    37
    Fri, Jan 31
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    37 Fri, Jan 31
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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
    273
    Fri, Jan 31
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    273 Fri, Jan 31
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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
    104
    Fri, Jan 31
    104
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    104 Fri, Jan 31
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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
    178
    Fri, Jan 31
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    178 Fri, Jan 31
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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
    52
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    52 Fri, Jan 31
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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
    92
    Fri, Jan 31
    92
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    92 Fri, Jan 31
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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)
    $193.99 each
    49
    Fri, Jan 31
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    49 Fri, Jan 31
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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)
    $174.99 each
    86
    Fri, Jan 31
    86
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    86 Fri, Jan 31
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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
    7
    Fri, Jan 31
    10
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    7 Fri, Jan 31
    3 Tue, Feb 4 – Wed, Feb 5
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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
    144
    Fri, Jan 31
    144
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    144 Fri, Jan 31
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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
    84
    Fri, Jan 31
    84
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    84 Fri, Jan 31
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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)
    $198.99 each
    61
    Fri, Jan 31
    61
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    61 Fri, Jan 31
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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
    63
    Fri, Jan 31
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    63 Fri, Jan 31
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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
    131
    Fri, Jan 31
    131
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    131 Fri, Jan 31
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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
    99
    Fri, Jan 31
    99
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    99 Fri, Jan 31
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  • FS-200-W NEMA-1 Paddle-Type Flow Switch Product Image
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    FS-200-W NEMA-1 Paddle-Type Flow Switch 00063067 FS-200-W NEMA-1 Paddle-Type Flow Switch
    SKU: 00063067
    Brand: Watts
    $199.99 each
    23
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    23
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    23 Fri, Jan 31
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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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