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McDonnell Miller Series FS7-4 Industrial Liquid Flow Switches

Industrial Liquid Flow Switches
Series FS7-4

• Universal design serves the widest variety of large pipe applications, including heating and hydronic systems, air conditioning, refrigeration and process work

• 1¼” NPT
• Brass with sealed tube construction
• Single pole, double throw snap switch
• Magnetic switching mechanism eliminates need for bellows
• Sensitivity adjusting screw makes flow adjustment easy
• Paddles can be trimmed to suit application needs
• Optional features
  – Extended paddle arm - Model FS7-4L
  – Two SPDT switches to make or break two separatecircuits
  – Stainless steel body and paddles
  – BSPT threads
  – Fire sprinkler service - Model FS7-4F- for 1¼” thru21⁄2” NPT piping only
• Minimum temperature (fluid or ambient) 32°F (0°C)
• Maximum temperature 300°F (149°C)
• Maximum operating pressure 300 psi (21 kg/cm²) 1000 psi (70 kg/cm²) – Stainless Steel models
• Pneumatic control - FS7-4A - option available w/⅛” NPT airline connection; max. 50 psi air supply (non-electrical)

Select a link under the "item" tab below to order.

Cat #DescriptionsPart NumberWeight Ibs.(kg)
FS7- 4Industrial flow switch1197005.5 ( 2.5)
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.4 44.4 125 VA at 120 or 240 VAC 50 or 60 cycles
240 VAC 3.7 22.2 125 VA at 120 or 240 VAC 50 or 60 cycles


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