Install Instructions

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