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Dwyer Series P4 Ryton® Piston Flow Switch

Fixed Set Points from 0.1 to 1.5 GPM, SPST and SPDT Switching, Optional Adapters

The Series P4 Ryton Flow Switch features a molded plastic construction for enhanced performance. Monitor liquids with fixed set points from 0.1 to 1.5 GPM. Choose normally open or normally closed SPST or SPDT hermetically sealed reed switch technology. The industrial switch features Ryton R4 housing and piston, 316SS spring, Viton® O-ring and Epoxy. The inlet and outlet ports are 9/16"-18 UNF- 2B thread with optional 1/8" and 1/4" NPT or 1/2" barbed adapters.

See Dimensions

Service: Water-based fluids.
Wetted Materials: Housing and Piston: Ryton® R4; Spring: 316 SS; O-ring: Viton®; Other: Epoxy.
Temperature Limits: 0 to 225°F (17 to 107°C).
Pressure Limits: 250 psi (17 bar) @ 54°F (12°C).
Accuracy: ±15% of set point.
Repeatability: ±1%.
Switch Type: SPST or SPDT.
Electrical Rating: 20VA.
Electrical Connection: 18 AWG, 24", PVC lead wires.
Process Connection: 9/16-18 UNF-2B or choice of connection adapters (sold separately.)
Mounting Orientation: Any.
Required Filtration: 50 microns or better.
Weight: 4 oz (0.11 kg).
Popular Models
Model Number Range Switch Type
 P4-11  .1 GPM  SPST, N.O.
 P4-12  .25 GPM  SPST, N.O.
 P4-13  .5 GPM  SPST, N.O.
 P4-14  .75 GPM  SPST, N.O.
 P4-15  1 GPM  SPST, N.O.
 P4-16  1.5 GPM  SPST, N.O.
 P4-31  .1 GPM  SPDT
 P4-32  0.25 GPM  SPDT
 P4-33  0.5 GPM  SPDT
 P4-34  0.75 GPM  SPDT
 P4-35  1.0 GPM  SPDT
 P4-36  1.5 GPM  SPDT
Optional Adaptors
Model Number Description
 P4-98  1/8" NPT
 P4-94  1/4" NPT
 P4-92  1/2" Barb
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