The Siemens 3RG7202-3CC00-0XB4 is a SIMATIC PXO630 K80 ATEX thru-beam sensor receiver rated for 50 m range with a PNP antivalent output. It runs on DC 10...36 V, sinks up to 200 mA, and connects via a 4-pole M12 connector. The 83x61x25 mm housing carries IP67, making it suited for Ex-zone 2/22 environments.
The antivalent output means the receiver switches its PNP transistor opposite to the light state — normally open when dark, closed when the beam is made. That's useful for fail-safe logic: if the sensor loses power or the beam is blocked, the output drops, which can trigger an alarm or stop a machine.