Xylem MM 613F Series FS4-3T General Purpose Liquid Flow Switch - Manual (Page 4)

4
INSTALLATION –
STEP 1 - Determine the Location of the Flow Switch
D FLOW
3/4 " or 1"
PIPE
5 x D
MINIMUM
5 x D
MINIMUM
D= PIPE DIAMETER
• 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 flo w
switch. The flow switch may be installed in a vertical
pipe if the flow is in the upward direction.
• 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 flo w.
• Some system conditions that require more than 5 pipe
diameters are high viscosity fluid and high fluid v elocity.
• The flow switch should be installed in the pump suction
piping when spring-loaded check valves and/or other
closed coupled accessories are installed in the pump
discharge piping.
STEP 2 - Connecting the Flow Switch to Pipe
a. Apply pipe sealing compound or PTFE tape to the
NOTE: Do not apply sealant to first threads as this
switch is grounded (earthed) via the pipe mounting.
FLOW
b. Insert pipe threads into flow switch and turn 2
or 3 times until tight.
• Place one pipe wrench on base of flo w
switch and one wrench on connecting piping.
Tighten to following torque values.
- 47 ft•lb (64 N•m) for 3/4” pipe
- 63 ft•lb (85 N•m) for 1” pipe
• Repeat to connect pipe to opposite side of
flow switch.
PTFE
pipe threads.