McDonnell & Miller 119750

FS7-4D, 1-¼” Flow Switch w/2 SPDT

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

• 11/4” 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 separate circuits
• Stainless steel body and paddles
• BSPT threads
• Fire sprinkler service - Model FS7-4F- for 11/4” thru 21/2”
• NPT piping only (see chart p.93)
• Minimum temperature (fluid or ambient) 32 Deg.F (0 Deg. C)
• Maximum temperature 300 Deg. F (149 Deg. 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)