Is my Flood Sensor always monitored? Follow Yes, like all environmental sensors, your Flood Sensor is always monitored even if the system is disarmed. Facebook Twitter LinkedIn Comments 0 comments Article is closed for comments. Articles in this section Where is the best place to mount my Flood Sensor? Is my Flood Sensor always monitored? What is the size of the Flood Sensor? What is the temperature range the Flood Sensor can work in?