Installation Guide McDonnell & Miller FS4-3 Liquid Flow Switch General Purpose. Universal Design. Features and Benefits Universal design serves the widest variety of applications For starting or stopping electrically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others Replacement for common flow switches from Johnson/Penn, Potter/Taco, Watts, Hydrolevel and other manufacturers 1″ NPT Two electrical knock-outs allows connection from either end Sensitivity adjusting screw makes flow adjustment easy Single pole, double throw snap switch Hardened stainless steel bearings minimize friction Sealed Monel bellows Four stainless steel paddles included -1″, 2″, 3″ & 6″ (25, 50, 80, & 150mm) Optional Features Two SPDT switches to make or break two separate circuits Materials of construction suitable for corrosive liquids BSPT threads Minimum temperature (fluid or ambient) 32°F (0°C) Maximum temperature 300°F (149°C) Maximum pressure 160 psi (11.3 kg/cm2)
