NF C48-331-2-5*NF EN 50131-2-5:2008 Alarm systems - Intrusion and hold-up systems - Part 2-5 : requirements for combined passive infrared and ultrasonic detectors.
2008NF C48-331-2-5*NF EN 50131-2-5:2008 Alarm systems - Intrusion and hold-up systems - Part 2-5 : requirements for combined passive infrared and ultrasonic detectors.