Small light barriers, W18-3 Ex, WT18X-3P920, switching distance max.: 10 mm ... 1,000 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: cable with M12 connector, 4-pin, setting: potentiometer, info: EX II 3G EX nA op is IIB T4 Gc XEX II 3D EX tc IIIB T135°C Dc X According to Directive 2014/34/EX/EU