A high reading at a salinity cell located in the loop seal of a flash type evaporator indicates what issue?

A high reading at a salinity cell located in the loop seal of a flash type evaporator indicates carryover in the first stage of the operation. This is due to the fact that the salinity cell measures the concentration of dissolved solids in the water. When there is carryover from the evaporator, it means that the brine (salty water) is not being properly separated from the steam, leading to higher concentrations of soluble materials in the water loop.

This situation can compromise the efficiency of the system and may also lead to the scaling of the evaporator surfaces, as higher salinity indicates contaminants are present. Therefore, a high salinity reading serves as an important alert that operational adjustments need to be made to ensure proper separation and to prevent potential damage or efficiency loss in the evaporator system.