Yes, the hitless reboot feature is available on NS series sensors. It may be dependant on the software version of your NS series sensor. To check if it's available go to
Devices > <Select NS Series Sensor> Maintenance > Reboot.
This screen will tell you if a hitless reboot is available for this sensor.
Thanks Peter. Because i don't see any infos in Product guides so i'm not sure about it!
I have frequently run into the same issue, the documentation can often be vague and confusing to try to understand.
Glad I could help.