Red Lion Controls PSA10000Product Attribute Attribute Value Primary Type Inductive Proximity Sensors Series PSA1 Series Overview 3 Wire Inductive Proximity Sensor, NPN Output Type, 0. 059 in. (Max.) Sensing Range Sense ferrous and non ferrous metal objects Operates from zero to 5 kHz pulse output rate The PSAC contains a sensing coil, oscillator, and schmidt trigger pulseshaper with an NPN open collector output that is compatible with most red lion controls' motion monitors,