GEMS SENSORS Liquid Flow Switch: Piston, PPS, 9/16 in UNF, 9/16 in Connection Size, UNF

The GEMS SENSORS FS-4 liquid flow switch is used to detect the presence or absence of liquid flow in a pipe. It is commonly applied in industrial cooling systems, lubrication circuits, and process control to trigger an alarm or shut down equipment when flow stops.

The GEMS SENSORS FS-4 is a general purpose piston flow switch with a fixed set point and normally open switch position. It has a 9/16 in UNF connection size, PPS construction, SPDT contacts, and a DC contact rating of 20 V. The manufacturer part numbers are FS-4 and 122355.

You can source the GEMS SENSORS FS-4 flow switch through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time on this item.

Install the GEMS SENSORS piston flow switch in a vertical or horizontal pipe section with the arrow on the body aligned to flow direction. Ensure the 9/16 in UNF connection is properly sealed. Wire the SPDT contacts according to your control circuit, respecting the 20 V DC rating. Test the set point after installation.