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Two-Cell Applications
7/99 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator’s Manual Appendix B - 3
Softener Monitoring
Softener monitoring by conductivity ratio gives a continuous indication of performance. Sodium
is typically more conductive than the hardness minerals it displaces, yielding a higher
conductivity at the outlet. A ratio approaching 1 indicates that hardness ions are breaking through
and that regeneration is needed.
Cell 2
(Hard) Water Supply
Cell 1
(Soft) Treated Water
a/n 23192
Softening Ratio =
Cell
Cell
1
2
Typical Ratio Range is 1 to 1.25
Steam Power Measurements
The three conductivity measurements in power plants relate to water chemistry parameters as
follows:
• Specific conductivity -- chemical treatment level
• Cation conductivity -- total anion contaminants
• Degassed conductivity -- non-volatile anion contaminants
• Cation minus degassed conductivities -- carbon dioxide
The 9782 Standard Range Analyzer/Controller includes a complete menu of field-selectable
functions for these determinations. In addition to specialized high purity temperature
compensation for specific and cation conductivity, the 9782 includes reboiler measurement
functions to automate ASTM Test Method D4519 for determining anions and carbon dioxide.