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Paddle Flow Switch for Air

The flow of liquids in pipelines plays an important role in industry and commerce. Under most circumstances it is essential to know whether or not there is a flow in a pipeline, and to act upon that knowledge. That is the reason for, and the function of, McDonnell & Miller Flow Switches. A complete line of Liquid Flow Switches has been developed for a wide range of applications and literally hundreds of uses, including:
 
·         Air Conditioning
 
·         Hot Water Space Heating Systems
 
·         Hot Water Supply Systems
 
·         Pump Systems
 
·         Water Cooled Equipment
 
·         Blending or Additive Systems
 
·         Liquid Transfer Systems
 
·         Fire Sprinkler Systems
 
·         Water Treatment Systems
 
·         Swimming Pool Chlorination
 
·         Industrial Laser Coolant System


AF 1 Air Flow Switches

• For general purpose applications with medium and high velocity requirements • Paddle fits 8″ (203mm) minimum duct size, or 6″ • (152mm) if trimmed • Brass, steel and aluminum construction • Single pole, double throw snap switch • Sensitivity adjusting screw makes flow adjustment easy • Two electrical knock-outs allow connection from either end • Can be equipped with a time delay relay • Optional features – Stainless steel – Anti-corrosion treatment • Minimum ambient temperature 32°F (0°C) • Maximum duct temperature 300°F (149°C)

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AF 2 Air Flow Switches

• For low velocity applications • Paddle fits 8″ (203mm) minimum duct size • Two electrical knock-outs allow connection from either end • Brass, steel and aluminum construction • Single pole, double throw snap switch • Sensitivity adjusting screw makes flow adjustment easy • Can be equipped with a time delay relay • Minimum ambient temperature 32°F (0°C) • Maximum duct temperature 300°F (149°C)

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AF 3 Air Flow Switches

• For general purpose low velocity applications where the most economical flow switch is desired • Paddle fits 8″ (203mm) minimum duct size • Two electrical knock-outs allow connection from either end • Brass, steel and aluminum construction • Single pole, double throw snap switch • Sensitivity adjusting screw makes flow adjustment easy • Can be equipped with a time delay relay • Optional feature • Two SPDT snap switches • Minimum ambient temperature 32°F (0°C) • Maximum duct temperature 275°F (135°C)

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AFE 1 Air Flow Switches

• For industrial hazardous environment applications requiring a NEMA 7 (Class I, Division I, Group C and D) or NEMA 9 (Class II, Division I, Group E, F, and G) • rated flow switch for medium velocity • 1⁄2″ NPT conduit connection • Paddle fits 8″ (203mm) minimum duct size • Brass, steel and aluminum construction • Single pole, double throw snap switch • Magnetic switching mechanism eliminates need for bellows • Sensitivity adjusting screw makes flow adjustment easy • Maximum ambient temperature 120°F (49°C) • Maximum duct temperature 275°F (135°C)

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