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FLOW RATES
Flow rates required to activate flow switch are shown
in chart below. The values are calculated for sensing
water (potable, non-polluted) in a horizontal pipe.
Flow Rates
Pipe
Size NPT
in. (mm)
Settings
gpm (lpm)
Factory or
3
⁄
(20)
4
or
Minimum
1
(25)
Maximum
Values are ± 10%
INSTALLATION –
STEP 1 - Determine the Location of the Flow Switch
• The flow switch should be located in a horizontal
section of pipe where there is a straight horizontal run
of at least 5 pipe diameters on each side of the flow
switch.
• The flow switch must be installed in the upright
position as shown with arrow mark on side of casting
in the same direction as fluid will flow.
• Some system conditions that require more than 5 pipe
diameters are high viscosity fluid and high fluid velocity.
• The flow switch should be installed in the pump suction
piping when spring-loaded check valves and/or other
close coupled accessories are installed in the pump
discharge piping.
Mode of Operation
Max. Flow
Rate gpm
Flow
No Flow
(lpm) w/o
gpm (lpm)
Paddle Damage
1.5
(5.7)
1.1
(4.2)
16.62 (63)
15 (56.8)
10 (37.9)
Settings will vary when used to sense flow of other
fluids.
NOTE: DO NOT USE LIQUID FLOW
27 (102)
3/4" or 1"
PIPE
Fluid Flow
MINIMUM
SWITCHES ON SYSTEMS WITH
FLOW VELOCITY GREATER THAN
10 FEET (3M) PER SECOND.
5 x D
MINIMUM
D= PIPE DIAMETER
D
5 x D
3
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