Omega Products FSW-21 User Manual
TRIM-TO-SIZE PADDLE-TYPE SWITCHES
FOR FLOW/NO FLOW DETECTION
For Piping Systems 11⁄4" and Up
1
⁄2 MNPT
(for all)
FSW-20 Series
Starts at
$
210
22.4 mm
(0.88")
FSW-22, $320,
shown smaller
than actual size.
1 MNPT
(for all)
Easy to Install
Switch Acts
Bidirectionally
Minimum Flow
Restriction
Less Than 3 psig
Pressure Drop
Low Cost
Reed Relay for
Long Life
FSW-20 Series paddle-type
switches are easily installed into
pipes ranging in size from 11⁄4" and
up, using an ordinary pipe tee or
threaded weld coupling. The paddle
pivots to move out of the liquid’s
path with increasing flow, thereby
activating the switch.The paddle is
easily cut for desired flow setting.
Models FSW-21 and FSW-22
feature high-pressure (2000 psig
max) and high-temperature
[to 150°C (300°F)] ratings for
rugged installations.
SPECIFICATIONS
Body Length: 86 mm (3.4")
Paddle Length: 140 mm (5.5")
Paddle Width: 25 mm (1")
Pressure Drop: 3 psig
Repeatability: ±5%
Setpoint Accuracy: ±25%
Note: 22 mm (0.9") max height boss
from pipe or tee OD for full paddle swing
Lead Wires: 18 AWG, 0.6 m (2')
long, polymeric
Max Viscosity: 200 SSU or
43 centistokes
Solid State
Relays
SBG Series
Starts at
$
Intrinsically safe
relays. For more
information visit
omega.com/sbg
132
SSRL Series
Starts at
For complete technical
and ordering information,
please visit omega.com/ssrl240_660
To Order (Specify Model Number)
Model Other Operating Temp Rating
No.
FSW-21 $210 Brass
FSW-22 320 316 SS ceramic (-30 to 300)
Models FSW-21 and FSW-22 Standard Actuation and De-Actuation Setpoints
Pipe Size
at Paddle
Cut-off Point
All flow rate tests for the above table were conducted with the switch installed in a standard
“T” fitting. For calculation of flow rates in pipe sizes larger than 5", a flow velocity of
approximately 0.5 fps actuates the switch with a full length (5") paddle.
Comes complete with operator’s manual.
Ordering Example: FSW-21, brass and 302 SS switch, $210.
Price Housing Paddle Wetted °C (°F) (psig) Switch
Marked
Act. Act. Act. Act. Act. Act. Act. Act. Act. Act. Act. Act
1
1
"
⁄
4
1
⁄
"
1
2
"
2
1
⁄
"
2
2
"
3
"
4
B-77
$
21
AVAILABLE FOR FAST DELIVERY!
Materials
302 SS
1
"1
1
⁄
4
Approximate Actuation and De-Actuation Flow Rates–GPM Water
De- De- De- De- De- De-
5313 8 22 15 29 22
PTFE, -34.4 to 149
Pipe Line Sizes
1
" 2" 2
⁄
2
15 11 28 21 38 30
22 15 27 20 48 38
21 14 40 26 52 39
Max
Pressure
2000 SPDT, 20 VA
1
" 3" 4"
⁄
2
31 20 45 32
39 25
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
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