McDonnell & Miller FS4-3D Flow Switch, 1" NPT

• 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. – Time delay (5 or 20 seconds). – Two SPDT switches to make or break two separate. circuits. – Reinforced paddles. – Materials of construction suitable for corrosive liquids. – Fire sprinkler service - Model FS4-3F only. – 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)