Process conductivity transmitter implementation

We use conductivity measurements to indicate when the chemical composition of the process changes. Examples are spill monitoring or controlling concentrations of blending processes. We usually think of this measurement as a simple and easy-to-use method that requires less attention than a pH or flow control system. The quality of the measurement usually has a direct impact on mill environmental compliance (as in spill monitoring) or product quality (as in controlling white liquor strenght to the digester). The importance of these measurements requires that we properly install and maintain them. The problems that we often experience come from an incomplete understanding of the theory of the measurement method. This paper provides a better understanding of the measurement method and presents some solutions for the selection process, installation, documentation, and final calibration. Application : this document is a source of information to be used by process engineers and technicians to properly select and implement conductivity-sensing systems. The measurement methods covered represent the majority of available technologies.