Sodium Hydroxide & Hydrochloric Acid Concentration Measurements - Honeywell 9782 Series Operator's Manual

Conductivity/Resistivity Analyzer/Controller
Sodium Hydroxide & Hydrochloric Acid Concentration Measurements
The measurement range of sodium hydroxide by conductivity is limited by temperature. The
conductivity is limited by temperature. The conductivity of sodium hydroxide reaches a
maximum value near 14% at 0º C and 29% at 100º C. Near the maximum there is poor resolution
and no reliable way to know which side of the peak is being measured. Therefore, the 7082
measurement range is restricted by temperature to assure reliable values. Maximum
concentrations are 10% at 0º C, 13% at 25º C and 20% at 75º C and above, with linear
interpolation between these points. Operation above these limits gives a flashing display.
The measurement range of hydrochloric acid is restricted to less than 15.5% above 40º C and less
than 18% below 40º C.
Appendix B - 4 9782 Series Conductivity/Resistivity Analyzer/Controller - Operator's Manual
Specific
Conductivity
Sample
Cell 1
Specific
Conductivity
Conductivity
7082
Analyzer
Sample
Cation
Exchanger
a/n 23193
Cation
Conductivity
9782
Analyzer
Cell 2
Cation
Exchanger
Degassed
Cation Conductivity
(Anions)
9782
Analyzer
Carbon Dioxide
by Calculation
Cell 1
Reboiler
Cell 2
7/99