What this sensor needs to match your line
The E3C-JC4P-2M: If you're slotting this into a replacement or a new build, the first thing to confirm is the output type — NPN or PNP — and the sensing distance. Those two specs aren't in the basic listing, so pull the datasheet or check the markings on the unit you're swapping out. The supply voltage is the one solid anchor we have: 12–24 VDC.