In a continuous process, one or more sensors control the separation of a process stream. In this case, only the phase-specific value of sonic velocity is monitored and kept constant.
Often, the product concentration of the carrier pha-se varies in the inlet. This quickly shifts the height of the phase boundary. Thus, the carrier phase could be pulled off with the product, which greatly affects the purity.
In process the separation is made via one pump in each of the two outlet pipes. In this way, for example, the continuous separation of a reaction mixture can be controlled. The advantages of the LiquiSonic® measuring and analyzing technology are both the extremely fast response time of less than 1 s and the connection of up to four sensors to only one LiquiSonic® controller. The controller processes all measuring values and passes the data to the process control system.
Depending on the type of vessel and process objectives different installation variants are possible, which are shown in the illustration below.
Installation variant 1
Most commonly, the sensors are installed on the side of the vessel. The requirement of the central sensor (measuring point 2) depends on the application and the forming of the intermediate phase.
Installation variant 2
By the use of a single sensor of a length of up to 4 m, the phase profile of the entire vessel can be determined. By mounting the sensor on a movable carriage, for example, and in combination with a distance meter, the phase boundaries can be accu-rately determined in their current height.
Installation variant 3 and 4
In vessels in which connections are not provided at the side or cannot subsequently be realized, the sensors are positioned directly in the vessel or by using a submerged tube in the right place, for example at heated double jacket vessels. Using a submerged tube, the sensor electronics are moun-ted apart at a distance of up to 15 m to the vessel.