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Dwyer Series P3 Polypropylene Flow Switch

Fixed Set Points from 0.25 to 2.0 GPM, 3/8” NPT or “Quick Disconnect” Adapters

Fit almost any piping requirements with the Series P3 Polypropylene Flow Switch. The basic piston design consists of a hermetically sealed SPST normally open reed switch. Choose the inlet and outlet port to be 3/8" male NPT or 1/4" male “Quick Disconnect”. Select a quick disconnect acetal adapter for straight through flow or with a shut off valve. The shut off valve will stop line flow when the adapter is removed from the switch. The flow will resume when the adaptor is reconnected. With many snap-on fittings to choose from, any flow application can integrate the P3 Flow Switch into the existing piping.

See Dimensions

SPECIFICATIONS
Service: Water based fluids.
Wetted Materials: Housing: Polypropylene; Piston: PPS composite; Spring: 316SS; O-ring: Fluorocarbon.
Temperature Limits: 0 to 212°F (-18 to 100°C).
Pressure Limits: 125 psi (8.6 bar) @ 70°F (21°C); 50 psi (3.4 bar) @ 212°F (100°C).
Accuracy: 20% of set point.
Switch Type: SPST, N.O.
Electrical Rating: 10VA.
Electrical Connection: 24" polymeric wire leads, 22 AWG.
Process Connection: 3/8" male NPT or 1/4" quick disconnect.
Mounting Orientation: Any.
Required Filtration: 100 microns or better.
Weight: 5 oz (0.14 kg).
Popular Models
Model Number Connection Range
 P3-31  3/8" NPT  0.25 GPM
 P3-32  3/8" NPT  0.50 GPM
 P3-33  3/8" NPT  1.0 GPM
 P3-34  3/8" NPT  1.5 GPM
 P3-35  3/8" NPT  2.0 GPM
 P3-41  Q Disconnect  0.25 GPM
 P3-42  Q Disconnect  0.50 GPM
 P3-43  Q Disconnect  1.0 GPM
 P3-44  Q Disconnect  1.5 GPM
 P3-45  Q Disconnect  2.0 GPM
Adaptors
Model Number Connection
 P3-801  Quick Disconnect Straight through 1/4" NPT
 P3-802  Quick Disconnect Straight through 1/4" BSPT
 P3-807  Quick Disconnect Straight through 1/4" ID Tubing
 P3-901  Quick Disconnect Straight through 1/4" NPT w/Shut-of Valve
 P3-902  Quick Disconnect Straight through 1/4" BSPT w/Shut-off Valve
 P3-907  Quick Disconnect Straight through 1/4" ID Tubing w/Shut-off Valve
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