The ORCA Sonar Bed Level transducer from Hawk Measurement emits a high-powered acoustic pulse, which is reflected from the interface density selected. The reflected signal is processed using specially developed software algorithms that eliminate lighter floating densities and stratified layers, allowing measurement of RAS or BED levels. It can be calibrated to measure lighter densities like FLOC or one of the outputs could be used for a CLARITY output, similar to a basic turbidity transmitter measuring solids in suspension. By choosing the correct sonar transducer frequency, it guarantees the optimized performance when measuring both light and heavy density interfaces. 978-304-3000; www.hawkmeasure.com