PNP Solid State Pneumatic Cylinder & Actuator Switch; D-F7 Series by SMC-CORPORATION at Days of Revelation. MPN: NA. Hurry! Limited time offer. Offer valid only while supplies last. One type of proximity switch is an enclosed reed switch that is activated by a permanent mounted to the piston. As the piston approaches, the field closes the switch, completing an electric circuit and producing an electric signal. Others prefer to use Hall-effect (Solid-State) sensors in combination with a piston-mounted. The main difference between these two devices is that a reed switch is a mechanical device, while a Hall-effect (Solid-State) switch is electronic, with no moving parts to
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