The constantly increasing degree of automation requires measurement solutions for the reliable detection of these phases or phase transitions in the ongoing process. The following considerations are decisive:
- Replacement of manual detection methods (e.g., visual), thus eliminating subjective influencing factors
- Replacement of faulty, indirect detection methods (e.g., time control), thus higher system safety
- Improvement of product yield through loss reduction
- Safety aspects
Batch process
In a batch process, the temporal change of the sound velocity signal is used to control a multi-way valve. A precise separation between product, intermediate, and carrier phases occurs. The phase differences can be detected within 250 milliseconds. The sensor is preferably installed in the pipeline. Alternatively, the sensor is integrated into the bottom drain valve of the company SchuF. By installing the valve, measurement can be performed directly in the vessel without dead space and without an extra process connection.
Continuous process
In a quasi-continuous process, the separation of a process stream into a product and a carrier phase is controlled by sensors mounted in a settling tank. In this case, only the sound velocity value characteristic of the respective phase is monitored and kept constant.
In this way, the separation of a wastewater stream into treatable and non-treatable wastewater can be controlled. Depending on the process conditions, the sensor installation can be carried out in different variants.
In a variety of process engineering processes, different phases arise in the involved liquids due to technology. This applies to both continuous and batch processes.
