The P-M series of gauge pressure switches are the most popular products in the Precision Sensors product line and are in service across hundreds of applications. The series is composed of the P12M, P18M, P20M, and P56M type switches. The polyimide diaphragm design offers extreme cycle life while maintaining great repeatability and a wide operating temperature range. The negative rate Belleville spring design is well suited for the harsh applications of aerospace vehicles. The hermetically sealed electrical switch is ideal when vapor ignition is a concern.

Common applications include fuel and hydraulic oil pressure, engine bleed air systems, static fan pressure.

For qualification information, please consult the sales or engineering departments.

Features

Intended for liquid or gaseous media
Wetted material 300 CRES, aluminum, polyimide, elastomer seal (varies by media)
Hermetically sealed contacts
Proven negative rate Belleville spring design for high cycle life and repeatability

Specifications*

Specification	P12M	P18M	P20M	P56M
Available settings	15 to 2500 psig	5 to 60 psig	1.0 to 30.0 psig	0.25 to 6.0 psig
Repeatability	2.0 psig + 2% of setting	0.5 psig + 2% of setting	0.1 psig + 2% of setting	0.05 psig + 3% of setting
Deadband	2.0 psig + 10% of setting	1.0 psig + 9% of setting	0.3 psig + 7% of setting	0.2 psig + 5% of setting
Proof pressure	4500 psig	500 psig	200 psig	200 psig
Operating temperature range	-65 to 250°F	-65 to 250°F	-65 to 250°F (high temperature configurations available)	-65 to 160°F
Typical weight	0.18 lbm standard configuration	0.23 lbm standard configuration	0.30 lbm standard configuration	0.37 lbm standard configuration
Electrical rating	7 Amps max. at 28 VDC	7 Amps max. at 28 VDC	7 Amps max. at 28 VDC	7 Amps max. at 28 VDC
Switch configuration	SPST, SPDT, DPST, DPDT	SPST, SPDT, DPST, DPDT	SPST, SPDT, DPST, DPDT	SPST, SPDT, DPST, DPDT
Pressure connections	MS fittings Pipe fittings Custom fittings available upon request
Electrical connections	Circular mil-spec connectors Free leads Custom electrical connectors available upon request
Warranty	18 months