PermaNet F leak noise sensors from Fluid Conservation provide water network managers with a fixed-base cellular network to monitor leakage. The compact sensors were designed to quickly install into small underground spaces, providing readings with dramatically reduced noise interference compared to those taken with aboveground sensors. The sensors work by recording noise levels and tracking consistent noise to build a sound profile. Units can then detect a leak after only one night. The sensors communicate with host software using 3G cellular communication, allowing large amounts of data to be transferred with no radio mesh infrastructure to maintain.