115V AC Switches | McMaster-Carr

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200 psi @ 70° F

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9 Products

Flow Switches with Sight

For monitoring flow at a glance, these switches have a plastic window with a rotor indicator that spins when there’s flow. They activate or deactivate equipment when the flow rate reaches your set point. Tighten or loosen the adjustment screw to choose your set point anywhere within the range. To measure flow, they count how many times the turbine turns as liquid flows through. Use them only with clean, low-viscosity liquids to prevent clogging the turbine and other damage. All are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed).

These switches are calibrated with water. They can also be used with other liquids but may not measure accurately if their viscosity is significantly different.

Choose a fitting material that is compatible with the liquid you're running through your line.

316 Stainless Steel Fitting and Brass Fitting—Brass and 316 stainless steel fittings resist impact better than polypropylene fittings.

Polypropylene Fitting—Polypropylene fittings work with a wide range of chemicals. However, they can crack from impact or when overtightened.

Any-Angle Mount—Flow switches with any-angle mounting position will measure accurately no matter how you orient them in your system.

	Max. Pressure @ Temp.	Temp. Range, ° F	Max. Switching Current @ Voltage	Mounting Position	End-to-End Lg.	Certification		Each
Polypropylene Body with Polypropylene Fittings







			1/4 NPT Female

			0.1 to 5	100 psi @ 70° F	33 to 180	95 mA @ 115V AC	Any Angle	3 1/16"	CE Marked UL Recognized Component	4138K11	0000000




					1/2 NPT Female

					1.5 to 20	100 psi @ 70° F	33 to 180	95 mA @ 115V AC	Any Angle	3 1/16"	CE Marked UL Recognized Component	4138K12	000000


					Brass Body with Brass Fittings







									1/4 NPT Female

									0.1 to 5	200 psi @ 70° F	33 to 212	95 mA @ 115V AC	Any Angle	3"	CE Marked UL Recognized Component	4138K13	000000




											1/2 NPT Female

											1.5 to 20	200 psi @ 70° F	33 to 212	95 mA @ 115V AC	Any Angle	3"	CE Marked UL Recognized Component	4138K14	000000




													3/4 NPT Female

													5 to 30	200 psi @ 70° F	33 to 212	95 mA @ 115V AC	Any Angle	3 15/16"	CE Marked UL Recognized Component	4138K15	000000




															1 NPT Female

															8 to 60	200 psi @ 70° F	33 to 212	95 mA @ 115V AC	Any Angle	3 15/16"	CE Marked UL Recognized Component	4138K16	000000


															316 Stainless Steel Body with 316 Stainless Steel Fittings







																			1/2 NPT Female

																			1.5 to 20	200 psi @ 70° F	33 to 212	95 mA @ 115V AC	Any Angle	3"	CE Marked UL Recognized Component	4138K18	000000




																			3/4 NPT Female

	5 to 30	200 psi @ 70° F																	33 to 212	95 mA @ 115V AC	Any Angle	3 15/16"	CE Marked UL Recognized Component	4138K19	000000




																			1 NPT Female

			8 to 60	200 psi @ 70° F															33 to 212	95 mA @ 115V AC	Any Angle	3 15/16"	CE Marked UL Recognized Component	4138K21	000000