Panasonic sd3 a1 safety laser scanner configurable zones panasonic sd3 a1 this laser safety scanner is the smallest in its class and is designed for monitoring hazardous areas the scanner can be used to monitor various zones within the 190 deg 50m measurement zone a warning zone of between 0 and 15m and configurable detection protected zones that are settable between 0 and 4m br br the principle by which the sensor operates is that a pulsed laser is beamed onto a rotating mirror