The measurement is potentiometric using a special electrode system comprising an Na-sensitive electrode in conjunction with an Ag/AgCl reference electrode.  It measures sodium over a range of 0.1-2,000 µg/l (ppb) with accuracy and repeatabiliry of ±2%. Outputs include up to six 4-20mA channels, along with relays for alarms and warnings. The analyzer is also available with Profibus DP communications.

The Liquiline System CA80SI colorimetric analyzer provides precise online analysis of silica to protect plant equipment from deposits to ensure optimum performance of turbines and ion exchangers. Deposits of insoluble silicon dioxide on internal boiler walls, heat exchangers, and turbine blades have an adverse effect on the efficiency of power plants and increase the risk of unplanned downtime and repairs. For this reason, the silica content in boiler feedwater must be monitored.

The CA80SI measures silica concentration from 0.5-200 µg/l or 50-5,000 µg/l, each with ±2% full scale accuracy. This allows the analyzer to determine the purity of boiler feed water and steam and to provide early warnings of condenser leaks or exhaustion of ion exchangers. Its standard heteropoly blue analysis method allows direct comparability to lab results.

Seamless integration into process control systems is provided by Modbus, EtherNet/IP, and PROFIBUS digital communication that can transmit advanced diagnostic information in addition to the measured variable.

Remote access via any device with a web browser is provided by an optional, integral web server, enabling full and secure access to the device configuration, measured values, diagnostic messages, logbooks, and service data. For more information, visit www.us.endress.com.