What it is and where it fits
This is a Square D / Telemecanique XS7C1A1DAL10 inductive proximity sensor – the kind you bolt near a shaft or a moving metal part to tell the PLC it's there or not. Out here in the grease, you want a sensor that shrugs off coolant splashes and vibration; the aluminum barrel and sealed head on these old Telemecanique jobs are built for that. Category is Inductive Proximity Sensor, plain and simple – no special tricks, just a solid metal-sensing workhorse.