PROCESS CONDUCTIVITY TRANSMITTER IMPLEMENTATION

We use conductivity measurements to indicate when the chemical composi tion of the process changes. Examples are spill monitoring or controll ing concentrations of blending processes. We usually think of this mea surement as a simple and easy-to-use method that requires less attenti on thana pH or flow control system. The quality of the measurement usu ally has a direct impact on mill environmental compliance (as in spill monitoring) or product quality (as in controlling white liquor streng th to the digester). The importance of these measurements requires tha t we properly install and maintain them. The problems that we often ex perience come from an incomplete understanding of the theory of the me asurement method. This paper provides a better understanding of the me asurement method and presents some solutions for the selection process , installation, documentation, and final calibration.