When Sea World of San Antonio, TX needed a reliable way to measure the saltwater level in their Sea Lion exhibit tanks, they turned to Flowline. Sea Lions are large, inquisitive mammals that often damage accessible instruments through investigation and play. As a result, the level sensors used in each holding tank, rank high on their equipment casualty list. Additionally, saltwater is highly corrosive and scaling. As such, contact sensors corrode or suffer from the affects of material build-up overtime, requiring maintenance and replacement. For these reasons, Flowline suggested the use of non-contact ultrasonic sensors, installed separate from the animals, in a stand-pipe, located behind each exhibit tank. The result is reliable life science tank level measurement. Here, an EchoSpan ultrasonic level transmitter is mounted in a clear PVC stand pipe. The two-wire, 4-20 mA signal output is connected to the PLC for level monitoring and alarms. When the level drops due to evaporation or splashing, the tank is automatically filled with additional saltwater.