Product Overview

90
Flow Switches
McDonnell & Miller
HJ KLMN
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
manufacturers
• 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
– Two SPDT switches to make or break two separate
circuits
– Materials of construction suitable for corrosive liquids
– 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
)
G
F
H
J
K
L
M
A
B
E
C
D
N
FLOW
Series FS4-3
Flow Switches – Liquid
Series FS4-3
General Purpose Liquid Flow Switches
®
®
Dimensions, in. (mm)
AB CD EFG
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)
Flow Switches