Omega Products FSW-25 User Manual
Trim To Size Paddle TyPe
liquid Flow SwiTch
FSW-25
U Aluminum Alloy
NEMA4 (IP65) Head
U Easy to Install
U Less than 3 psig
Pressure Drop
The FSW-25 flow switch is
activated by the force of liquid
which moves the paddle detecting
the flow of the liquid in the pipe. In
static liquid or no liquid situations,
the spring pushes the paddle back
to the no-flow condition. The reed
switch is normally open.
As flow occurs and the paddle is
raised at an upward angle of 20 to
30 degrees (or more), the paddle
will push the magnet upward to
actuate the reed switch which then
closes the circuit.
The length of the paddle can be
adjusted to the diameter of the pipe.
1" trim size can only be used with
metal pipes.
The installation is simple.
Cut the paddle to desired
pipe size. No smaller
than 1" pipes for metal
pipes. The FSW-25 is
not recommended to be
used in 1 NPT plastic
pipe (1
for plastic pipes). Before
installing the unit to a
tee pipe, be sure to
apply tape seal to the
screw then tighten up.
The FLOW mark on the
screw hexagon must be
parallel to the pipe and
the ground.
1
⁄4 is the minimum
SPECIFICATIONS
Housing Material:
Aluminum Alloy, NEMA 4 (IP65)
Operation Temp.: -30 to 150°C
(30 to 300°F)
Paddle Material: SUS304
(Similar to 304 SS)
Operation Pressure: 355 psig
Pressure Drop Allowance: 3 psig
Set Point Tolerance: ± 25%
Repeatability Tolerance: ± 5%
Contact Capacity:
30 Watts/200 Vdc, SPDT
Maximum Viscosity: 200 SSU or
43 centistokes
B
1 NPT
FSW-25 shown
smaller than
actual size.
Standard Actuation and De-Actuation Setpoints
Pipe Line Size
1" 1¹⁄₄" 1¹⁄₂" 2" 2¹⁄₂" 3"
Approximate Actuation and De-Actuation Flow Rates–GPM Water
Paddle De- De- De- De- De- De-
Length Act. Act. Act. Act. Act. Act. Act. Act. Act. Act. Act. Act.
1 5 4 8.5 6.5 12 9 17 15
1¹⁄₄ 6.5 4.5 9 7 15 12 23 20
1¹⁄₂ 14 10 23 16 32 25
2 18 12 24 17 33 27
2¹⁄₂ 20 13 27 22
3 22 16
To Order Visit omega.com/fsw-25 for Pricing and Details
Model No. Description
FSW-25 Paddle flow switch with head
70A-1 Audible alarm
SSRL240AC10 10 Amp solid state relay
Comes complete with operator’s manual.
Ordering Example: FSW-25, flow switch.
B-78
1”
11⁄4”
11⁄2”
2”
1
2
3”
⁄2”
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