The scrubbing liquid of an emergency vent scrubber circulates and is continually in contact with the gas stream to be cleaned. If toxic or environmentally hazardous chemicals are included in this stream, they will be absorbed. Even during standard operation (without emergency), certain components, e.g. CO2, are chemically bound and the NaOH concentration decreases. In order to ensure an effective absorption in the event of an emergency and a sufficient volume of scrubbing liquid, the concentration of NaOH and salts (NaCl and Na2CO3) must be monitored.
If the NaOH content is under limit, it must be redosed. In case of too high salt content, the salt must be removed from the circulation stream, to prevent crystallization in the system and blocked nozzles. The LiquiSonic® 40 analyzer allows the concentration measurement of 3-components-liquids, due to the parallel detection of two physical quantities such as sonic velocity and conductivity.