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McDonnell Miller Flow Switches

FS4-3 Series General Purpose Flow Switches ---

Maximum pressure, 150 PSI
Maximum temperature, 300°F
Minimum temperature (fluid or ambient) 32°F
Serves a wide variety of applications in air-conditioning, heating, water systems, and in processing work - wherever it is important to know when flow or no-flow occurs
Switch: Single-pole, double throw Compact in size. Snap action assures dependable operation
Adjusting Screw: Provides simple way to field adjust sensitivity to flow
Packless: Monel bellows seals switch assembly from line
3-in-1 Paddle: Individual monel paddles are quickly adaptable for 1" to 3": pipe

Now available in NEMA 4X (Watertight, Dust-tight, and Corrosion Resistant) Models; NEMA 7 and 9 Models (Hazardous Location); and Standard Models
Available in either Brass or Stainless Steel construction
Models FS7-4W and FS7-4SW (NEMA 4X) are ideal for outdoor use in ambient temperatures and/or fluid temperatures as low as -65°F
Models FS7-4E and FS7-4E (NEMA 7 & 9) are Underwriters' Laboratories, Inc. Listed for use in Hazardous Locations
Standard Models may be ordered in both single and double switch versions

Maximum pressure 150 PSI
Maximum temperature, 225°F
Minimum temperature (fluid or ambient) 32°F
NEMA 4X (Watertight, Dust-tight, Corrosion Resistant) construction
Particularly suited for use in areas of high humidity, and out-of-doors installation
Individual paddles are adaptable for pipe 1" to 3", extended paddle for pipe to 6" is also included
Installs in tee or welding neck in horizontal pipe; 1" threaded connection

Maximum temperature 300°F; Minimum temperature 32°F
Designed for medium and higher velocity systems
AF1 units have a single-pole double-throw switch, can be wired to make one circuit, break a second circuit, when air flow starts or stops in a duct
Can be installed in the side, top or bottom of a horizontal duct and, if necessary, in a vertical duct with upward air flow. If the only possible installation is in a vertical duct with downward air flow, contact Inotek for instructions, giving duct size and air flow velocities
Stainless Steel; parts exposed to inside of duct are made of 18-8, 302 and 316 stainless steel, and Viton® (Registered trademark of DuPont Dow Elastomers)
Switch compartment is sealed from duct by a Viton flexible rolling seal; this is a completely tight seal

FS1 offers an economical and dependable answer for many jobs inside buildings, such as air conditioning, heating/water systems and processing work
FS1-W adds versatility to those characteristics by allowing use outdoors and in environments where humidity or airborn particles are a problem
May be used with water, certain light, viscous liquids, fuel oil, and some oils
Switch mechanism is magnetically activated and has no physical contact with the liquid
Switch compartment is totally sealed from the liquid in the line and all wetted parts are brass, stainless steel, and Viton® (Registered trademark of DuPont Dow Elastomers)
Threaded 1/2" on both inlet and outlet sides and requires no further pipe fittings
FS1: Maximum pressure 100 PSI.; Maximum temperature 225°F; NEMA 1 Enclosure; Minimum Fluid/Ambient Temperature 32°F
FS1-W: Maximum pressure 100 PSI.; Maximum temperature 225°F; NEMA 4X Enclosure; Minimum Fluid/Ambient Temperature 32°F

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