Level measurement for liquids
The Reflex VG7 Series two-wire FMCW (Frequency Modulated Continuous Wave) Radar is the most advanced in the Hycontrol range of radar technology products. The probes are unaffected by pressure, temperature, viscosity, vacuum, foam dust or changes in dielectric constant and can measure virtually any liquid or solid product utilising either Horn or Drop Antenna. This radar gauge can measure distance, level or volume.
The FMCW radar uses a high frequency (26 GHz) signal which increases in frequency during the measurement. The emitted signal is reflected back from the product surface and received after a time delay. Further signal processing of the difference between transmit and receive frequencies is carried out and this difference is directly proportional to the level.
For process vessels with complex internal structures such as pipes, heating coils or agitators/stirrers, then the ETS (Empty Tank Spectrum) is required. ETS effectively maps out all unwanted signals by viewing the tank empty and memorising all the return signals from internal structures such as pipes, heating coils and agitators.
The VG7 Radar will then only monitor the moving liquid levels and ignore the static objects from the empty tank spectrum providing reliable level measurements.