Allows the system to turn off pumps when there is a domestic all for H/W (Priority delay), or turn pumps on when there is flow in a circuit (Indirect Domestic Heating), as well as many other applications.
• 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)
For more information view: FS251 Tech Sheet(73kb)
Part Number: FS251
