Recovery of raw materials
Chemical raw materials are valuable. That’s why the basic substances are reclaimed from the residues of the production processes. A common method of product separation is recirculation into so-called separating bottles. These relatively long vessels are usually made of glass because of its high chemical resistance. The product mixture is transferred to the separating bottle where separation takes place via the difference in specific gravity. In order to have the separated products pumped out automatically, the total level as well as the position of the product interface must be known.
Interface measurement with VEGAFLEX 67
Since microwaves penetrate nonconducting media, such as hydrocarbons, interface measurement in addition to pure level measurement is possible. The two substances must merely have different dielectric constants (DK value). The classic interface application, oil on water, provides a strong reflection at the boundary layer due to the great difference between the dielectric constants (oil DK = 2 , water DK = 80). Interestingly, the total level can also be measured with the VEGAFLEX 67 sensor. The measurement data from the two signal outputs are transmitted to the signal conditioner either as digital HART or 4 … 20 mA signal.
