English to French Tech/Engineering Computers: Hardware Vidéosurveillance

Here "idle" has a sense of "loitering" as in "No loitering"
This function of a suvervillance camera notices only objects or people that stays for a long period of time in the defined zone. So a person just passing by won't trigger anything but a person staying longer than a defined time will trigger an alarm.
I am thinking of "Zone sans arrêt"
Any better suggestions?