Flooded member detection by means of ultrasound

A sensor system for detecting if water or air is present in a hollow member, comprising a first acoustic sensor assembly mounted in a first housing placed on one side of the hollow member, a second acoustic sensor assembly mounted in a second housing placed on the opposite side of the hollow member relative to the first housing, a controller unit connected to the first and/or second sensor assemblies, and where the first and second sensor assemblies and the controller unit (40) are provided with power supply, wherein

• each of the first and second sensor assemblies comprises a set of probes connected to electronics for transmitting and receiving signals, and where the housings comprises fastening means for connecting the housings, and thus the probes, to the hollow member, and where
• the controller unit comprises a micro-controller, software for controlling and coordinating transmission and reception of signals between said probes and means for registering and logging data generated by the sensor assemblies;
• and
• wherein each probe in the first sensor assembly on one side of the hollow member is configured to transmit an acoustic signal to each probe in the second sensor assembly on the opposite side of the hollow member for subsequent registering and logging by the controller unit;
• and each probe in the second sensor assembly is configured to transmit an acoustic signal to each probe in the first sensor assembly for subsequent registering and logging by the controller unit.