Flow Switches
McDonnell & Miller Flow Switches are equipped with either one or two SPDT switches except for Model FS7-4A (Pneumatic).
Information:
They can make or break an electrical circuit when flow starts or when flow stops, and can be used to:
- Actuate a signal when flow stops
- Start a motor with flow, Shut off an alarm when flow is adequate Stop a motor with no flow
- Size of pipe
- McDonnell & Miller Flow Switches may be used on pipe sizes 1/2" - 36" NPT.
- How much flow is present?
- The flow rate at which the flow switch is to respond should be determined next. McDonnell & Miller Flow Switches are actuated (make or break) with an increase in flow. The term “Flow” represents the actual movement (velocity) of liquid within a pipe sufficient to actuate the switch. The term “No-Flow” represents a decrease in velocity, or total flow stoppage, which will permit the switch to return to its original position. IMPORTANT: In operation, the switch must be actuated by “Flow” before it can be reversed again by “No-Flow”. All McDonnell & Miller Flow Switches can easily be adjusted in the field to require a higher actuating “Flow” or “No-Flow”.
- Maximum liquid pressure in pipe
- The maximum pipeline pressure should be considered when selecting a particular model. Different flow switch models can accommodate a range of pipeline pressures up to 1000 psi (70kg/cm2).
- Maximum temperature
- Determine the liquid and ambient atmospheric temperature when selecting the flow switch model. Various McDonnell & Miller Flow Switches can be used at ambient temperatures from 32°F (0°C) and liquid temperatures up to 300°F (149°C). If ambient temperatures are lower than 32°F (0°C) use the FS7-4W.
- Type of liquid
- McDonnell & Miller Flow Switch models have wetted parts of brass, monel or stainless steel. Depending on the particular model they may be used with water, certain light viscous fluids, some oils, various caustic solutions and other fluids.
- Atmosphere surrounding flow switch
- It should be determined if the location will be subject to high humidity, weather conditions or explosive atmospheres. Standard, water tight and hazardous duty flow switch models are available.
If you have any questions please give us a call at 1-800-781-7405 or email us your request. Sales@NationalPumpSupply.com
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120610 McDonnell & Miller FS254 Flow Switch With NEMA 4 Enclosure
McDonnell & Miller
$314.95120610 McDonnell & Miller FS254 Flow Switch With NEMA 4 Enclosure, Replaces FS8-W. McDonnell & Miller FS254 Brochure Features: Universal design serves the widest variety of applications For starting or stopping electrically operated...$314.95 -
113200 McDonnell & Miller FS-1 1/2" Liquid Flow Switch
McDonnell & Miller
$315.95113200 McDonnell & Miller FS-1 1/2" Liquid Flow Switch. McDonnell & Miller FS1 Instruction Manual Features: For general purpose applications where high sensitivity is required and moderate or low flow rates are encountered such as air...$315.95 -
114780 McDonnell & Miller FS5-1 - 1" Flow Switch
McDonnell & Miller
$339.95114780 McDonnell & Miller FS5-1 - 1" Flow Switch 114780. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT, 1" NPT Materials of construction: Brass,...$339.95 -
123000 McDonnell & Miller Air Flow Switch AF1-S
McDonnell & Miller
$444.95123000 McDonnell & Miller Air Flow Switch AF1-S. *Please note image is generic. McDonnell & Miller AF1 Flow Switch Instruction Manual For general purpose applications with medium and high velocity requirements: Paddle fits 8" (203mm)...$444.95 -
114760 McDonnell & Miller FS5-3/4 - 3/4" Flow Switch
McDonnell & Miller
$354.95114760 McDonnell & Miller FS5-3/4 - 3/4" Flow Switch 114760. Information: McDonnell & Miller FS5 Instruction Manual Features: For general purpose applications requiring low flow rate sensitivity In-line configuration eliminates need...$354.95 -
114900 McDonnell & Miller FS4-3T2-3/4 - 3/4" Flow Switch
McDonnell & Miller
$324.95114900 McDonnell & Miller FS4-3T2-3/4 - 3/4" Flow Switch With NPT Body Medium Flow Rate 114900. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms,...$324.95 -
115300 McDonnell & Miller FS4-3T3-1 - 1" Flow Switch
McDonnell & Miller
$351.95115300 McDonnell & Miller FS4-3T3-1 - 1" Flow Switch With NPT Body Low Flow Rate 115300. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms, motors,...$351.95 -
115000 McDonnell & Miller FS4-3T3-3/4 - 3/4" Flow Switch
McDonnell & Miller
$324.95McDonnell & Miller FS4-3T3-3/4 - 3/4" Flow Switch With NPT Body Low Flow Rate 115000. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms, motors,...$324.95 -
123200 McDonnell & Miller AF2 Air Flow Switch Model AF2
McDonnell & Miller
$348.95123200 McDonnell & Miller Air Flow Switch Model AF2. McDonnell & Miller AF1 Flow Switch Instruction Manual For low velocity applications: Paddle fits 8" (203mm) minimum duct size Two electrical knock-outs allow connection from either...$348.95 -
114550 McDonnell & Miller FS4-3D 1" Flow Switch
McDonnell & Miller
$358.95McDonnell & Miller FS4-3D 1" Flow Switch 4-3 W/2 SPDT Switches 114550. McDonnell & Miller FS4 Brochure McDonnell & Miller FS4 Instruction Manual Universal design serves the widest variety of applications. For starting or stopping...$358.95 -
113550 McDonnell & Miller FS1-J Flow Switch
McDonnell & Miller
$332.95113550 McDonnell & Miller FS1-J Flow Switch. *Please note image is generic. McDonnell & Miller FS1 Instruction Manual For general purpose applications where high sensitivity is required and moderate or low flow rates are encountered such as...$332.95 -
114800 McDonnell & Miller FS4-3T1-3/4 - 3/4" Flow Switch
McDonnell & Miller
$318.95114800 McDonnell & Miller FS4-3T1-3/4 - 3/4" Flow Switch. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering...$318.95 -
115200 McDonnell & Miller FS4-3T2-1 - 1" Flow Switch
McDonnell & Miller
$314.95115200 McDonnell & Miller FS4-3T2-1 - 1" Flow Switch With NPT Body Medium Flow Rate 115200. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms,...$314.95 -
115100 McDonnell & Miller FS4-3T1-1 - 1" Flow Switch
McDonnell & Miller
$328.95115100 McDonnell & Miller FS4-3T1-1 - 1" Flow Switch With NPT Body High Flow Switch. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms, motors,...$328.95 -
120605 McDonnell & Miller FS8-WZ Flow Switch 1 NPT
McDonnell & Miller
$314.95120605 McDonnell & Miller FS8-WZ Flow Switch 1 NPT. *Please note image is generic. Information: Mcdonnell & Miller 120601 Instruction Manual Features: For general purpose applications with environmental exposure, or those requiring...$314.95 -
114763 McDonnell & Miller FS5-D-3/4 - 3/4" Flow Switch
McDonnell & Miller
$359.95McDonnell & Miller FS5-D-3/4 - 3/4 Flow Switch With/2 SPDT Switches 114763. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT, 1" NPT Materials of...$359.95 -
115654 McDonnell & Miller FS6-WJ-1 Flow Switch 1 BSTP
McDonnell & Miller
$484.95115654 McDonnell & Miller FS6-WJ-1 Flow Switch 1 BSTP. *Please note image is generic. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required,...$484.95 -
119980 McDonnell & Miller FS7-4LJ Flow Switch 1-1 4 BSTP
McDonnell & Miller
$484.95119980 McDonnell & Miller FS7-4LJ Flow Switch 1-1 4 BSTP. *Please note image is generic. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest variety of large pipe...$484.95 -
115650 McDonnell & Miller FS6-J-1 Flow Switch 1 BSTP
McDonnell & Miller
$424.95115650 McDonnell & Miller FS6-J-1 Flow Switch 1 BSTP. *Please note image is generic. McDonnell & Miller FS6 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Very high flow capacity Actuates at extremely...$424.95 -
115550 McDonnell & Miller FS6-J-3 4 Flow Switch 3 4 BSTP
McDonnell & Miller
$424.95115550 McDonnell & Miller FS6-J-3 4 Flow Switch 3 4 BSTP. *Please note image is generic. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required,...$424.95