Submittal Sheet

90
Flow Switches
McDonnell & Miller
H J K L M N
NPT
1
11
⁄
16
(43) 1
7
⁄
16
(37) 1
1
⁄
8
(29) 3
7
⁄
16
(87) 2
1
⁄
16
(52) 1
• 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
m a n u f a c t u r e r s
• 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
– Materials of construction suitable for corrosive liquids
– Fire sprinkler service - Model FS4-3F only for 1", 1
1
/
4
",
& 1
1
/
2
" NPT piping only (see chart) next page (p. 89)
– BSPT threads
• Minimum temperature (fluid or ambient) 32°F (0°C)
• Maximum temperature 300°F (149°C)
• Maximum pressure 160 psi (11.3 kg/cm
2
)
Series FS4-3
F l ow Switches – Liquid
Series FS4-3
General Purpose Liquid Flow Switches
Dimensions, in. (mm)
A B C D E F G
3 (76) 1
1
⁄
2
(38)
7
⁄
8
(22) 2
7
⁄
32
(56) 8
7
⁄
16
(211) 2
15
⁄
16
(75) 3
3
⁄
8
(86)
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.4 44.4
125 VA at
240 VAC 3.7 22.2
120 or 240 VAC
50 or 60 cycles
(for specified models)
11. Flow Switches 86-95• 3/6/07 2:02 PM Page 90