4
a.
If the paddle must be trimmed, measure the
paddle from the center of large hole (A) to the
length required. Using non-serrated tin snips,
trim the end (B) on a curve just like the paddle
was originally cut.
A
B
Required
Length
STEP 1 - Paddle Sizing
1
" (25mm)
2
" (51mm)
3
" (76mm)
6
" (152mm)
Determine the correct paddle length for your installation from the
chart below.
NOTE:
All models include 4 paddles as shown.
Pipe
Flow
No-Flow
Size NPT
Maximum
Maximum
in. (mm)
Adjustment
Adjustment
2
(50)
118.5
99.5
3
(80)
278.0
227.0
4
(100)
442.0
391.0
5
(125)
847.0
762.0
6
(150)
1440.0
1325.0
Series FS8-W “K” Factor
b.
If the flow rate in the pipe exceeds the
maximum adjustment on the Flow Switch
use the following formula to change the
paddle lengths.
Paddle Length =
K
_______________
Flow Rate (GPM)
NOTE:
If trimming the paddle for a no-flow action make sure
there is enough flow to activate switch.
Pipe Size
Paddle Trim to Length
(Standard Length)
in.
(mm)
in.
(mm)
in.
(mm)
1
(25)
1
(25)
N/A
1 1/4
(32)
2
(25)
1 1/4
(32)
1 1/2
(40)
2
(51)
1 1/2
(38)
2
(50)
2
(51)
1 5/8
(41)
2 1/2
(65)
3
(76)
2 1/4
(57)
3
(80)
3
(76)
2 5/8
(67)
4
(100)
6
(152) 3
5/8
(92)
6
(150)
6
(152)
5 5/8
(143)
8+
(200+)
6
(152)
N/A