120610 Model FS254 McDonnell Miller Flow Switch

The McDonnell & Miller FS254 flow switch NEMA 4

Tech Sheet

Installation Guide

General-Purpose, Liquid Flow Switches, the Series FS250 – FS251 (NEMA1 version), and FS254 (NEMA4 version). These flow switches incorporate key changes to address customer expressed needs of greater reliability and lower flow sensing capabilities in a general purpose flow switch.

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 Connection
• Two electrical knock-outs allows connection from either end
• Sensitivity adjusting screw makes flow adjustment easy
• Single pole, double throw snap switch
• EPDM O-ring sealed
• Four stainless steel paddles included -1″, 2″, 3″ & 6″ (25, 50, 80, & 150mm)
• Minimum temperature (fluid or ambient) 32°F (0°C)
• Maximum temperature 227°F (107°C)
• Maximum pressure 160 psi (11.3 kg/cm2)
• Models
  • FS251 – NEMA 1 enclosure
  • FS254 – NEMA 4 enclosure