FS-251, General Purpose Mechanical Liquid Flow Switch, NEMA 1, (4) Rigid Paddles, 1" NPTM McDonnell & Miller
FS-251, General Purpose Mechanical Liquid Flow Switch, NEMA 1, (4) Rigid Paddles, 1" NPTM
Brand: McDonnell & Miller
Part#: 120611
Model: FS-251
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Description

McDonnell & Miller FS-251 is a universal mechanical liquid flow switch, designed for turning On or Off a wide variety of electrically-operated equipment (pumps, alarms, burners, etc.). Includes a set of (4) rigid stainless paddles for use with various diameter pipes (sizes 1" through 8"). Integral screw for adjusting flow sensitivity. NEMA 1 enclosure for indoor use only. Standard 1" male NPT threaded connection.

Cross-References:
  • McDonnell & Miller: FS4-3
  • Hydrolevel: FS200
  • Taco: IFS01/02/H1/H2

Features:
  • Includes (4): 1", 2", 3", & 6" rigid stainless steel paddles for fitting into pipes of different sizes
  • Starts or stops electrical equipment, such as pumps, alarms, motors, burners, and metering devices, when water flow is detected in a system
  • Replaces common flow switches from Johnson/Penn, Taco, Watts, Hydrolevel, and other manufacturers
  • Suitable for pipe sizes from 1" to 8"
  • Adjustable flow senstitivity via internal screw
  • cULus listed

Technical Specifications:
  • Electrical Specs: SPDT (Relay Type), NEMA 1 Enclosure
  • Application: 1" - 8" pipe sizes
  • Flow Rates: Refer to image specs for minimum and maximum rates for 1" - 8" pipe sizes
  • Connection: 1" NPT, Threaded
  • Max Flow Velocity: 10 ft/sec
  • Pilot Duty: 125 VA @ 120 or 240 VAC; 50/60 Cycles
  • Switch Rating: 7.4 FLA, 44.4 LRA @ 120 VAC; 3.7 FLA, 22.2 LRA @ 240 VAC
  • Max Pressure: 160 psi
  • Max Water Temperature: 250°F
  • Max Ambient Temperature: 120°F

Warranty:
1-year warranty from the date of installation; 2-year warranty from the date of manufacture

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