The FSW-25 flow switch utilizes the force of liquid flow to propel its
paddle and to detect the incoming flow or movement of the existing
liquid in the pipe. In static liquid or no liquid, the spring is in expanded
and presses the magnet downward. The reed switch is normally open.
As flow occurs and the paddle is raised at an upward angle of 20 to
30 degrees (or more), the paddle will push the magnet upward to
actuate the reed switch which then closes the circuit.
The length of the paddle can be adjusted to the diameter of the pipe.
1" trim size can only be used with metal pipes.
The installation is simple. Cut the paddle to desired pipe size. No smaller
than 1" pipes for metal pipes. The FSW-25 is not recommended to be
used in 1 NPT plastic pipe (1-1/4 is the minimum for plastic pipes). Before
installing the unit to a tee pipe, be sure to apply tape seal to the screw
then tighten up. The FLOW mark on the screw hexagon must be parallel to the pipe
and the ground.
SPECIFICATIONS: Housing Material: Aluminum Alloy, NEMA 4 (IP65) Operation Temp.: -30 to 150°C (30 to 300°F) Paddle Material: SUS304 (Similar to 304 SS) Operation Pressure: 355 psig Pressure Drop Allowance: 3 psig Set Point Tolerance: ±25% Repeatability Tolerance: ±5% Contact Capacity: 30 Watts/200 Vdc, SPDT Max Viscosity: 200 SSU or 43 centistokes