Remote fluid level monitoring for a sealed industrial container
The constraint: nothing could be drilled through the wall, nothing fitted below the lid line, and a non-technical technician had to install it with zero on-site configuration. Several sensing technologies were tested against the container's real geometry and ruled in or out on evidence, with false-alarm filtering engineered in from the start.
Field-ready prototype. Persistent configuration, debounced alarms, audible and remote outputs. No holes drilled.