Series P1 Brass Flow Switch

Product Applications

  • Industrial cleaning equipment
  • Detecting loss of fluid in hydraulic systems
  • Assuring proper coolant flow in semiconductor processing


The Series P1 Brass Flow Switches utilizes a piston-type design for accurate detection of excessive or insufficient flow rates. The switches have preset actuation points from 0.10 to 1.5 GPM for liquid flow.


ServiceCompatible liquids.
Wetted MaterialsHousing: brass; Piston: polysulfone; Spring: 316SS; O-Ring: Fluoroelastomer, Other: Epoxy.
Temperature Limit-20 to 225°F (-29 to 107°C).
Pressure Limit1000 psig (68.9 bar).
Switch TypeSPDT.
Electrical Rating.17 A @ 120 VAC, .08 A @ 240 VAC, .13 A @ 120 VDC, .06 A @ 240 VDC.
Electrical Connections18 AWG, 24″ (60.96 cm), Polymeric lead wires.
Process Connection1/4″ female NPT.
Mounting OrientationAny position. Set points shown are based on vertical, inlet down position.
Required Filtration50 microns or better.
Weight0.66 lb (301 g).
Agency ApprovalsCE


  • Piston-type operation yields accurate detection of low flow rates
  • The piston magnetically actuates a hermetically sealed SPST reed switch