Compact light barriers, W27-3 Ex, WTB27X-3P1811, switching distance max.: 30 mm ... 1,600 mm, sensor principle: reflection light sensor, detection principle: background suppression, switching output: PNP, switching type: light/dark switching, connection type: cable, 4-wire, setting: potentiometer, info: EX II 3G EX nA op is IIB T4 Gc X, EX II 3D EX tc IIIB T135°C Dc X In accordance with Directive 2014/34/EU (ATEX) and DIN EN ISO/IEC 80079-34, we would like to point out that it is your responsibility to ensure that the device you have ordered can be traced back to your customer (documentation of your customer data and the associated product data, such as item number, date code, serial number).