The distance (ullage) between the antenna and the surface of the liquid is measured through the propagation of the radar signal, using FMCW (Frequency Modulation Continuous Wave). An embedded Digital Signal Processor computes the distance. The calculated ullage in millimeters is then directly sent to the cargo control room, along with information about temperature and pressure signals. The use of Intrinsically Safe, two-way digital signal transmission between the radar gauge and the central monitoring system enables easy integration of the EM540 into any type of control system.
The EM540 Radar employs advanced smart sensor technology, including microprocessors performing signal processing. In addition to transmitting tank level, pressure and temperature data to the central monitoring system, it provides self-diagnostics, self-monitoring and remote configuration. The unit is compliant with certification rules and regulations issued by international classification societies. Its proprietary flat antenna "Planar" reduces product build-up and makes the cleaning procedure quick and easy.