Safety gate system, safe interlock and safe guard locking device For applications up to SIL CL 3 and PL e. Consisting of 5 pushbuttons: 1. Illuminated pushbutton for activating the safety gate; 2. Key button for accessing & interlocking the safety gate; 3. Illuminated pushbutton; 4. Illuminated pushbutton; 5. Section stop pushbutton Delivery scope: Sensing device with pushbuttons incl. colour cap