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Operating the Analyzer
40 UDA2182 Universal Dual Analyzer Product Manual January 2009
5.9.7 Troubleshooting
In normal operation, both the direct electrode pH measurement and the pH from
differential conductivity should very closely match each other.
If they DO NOT match each other, the possible causes are listed below:
1. Upsets in water chemistry, such as cation exchange resin exhaustion, can cause the
pH readings to not agree with each other.
CHECK EXCHANGE RESIN
2. A low reboiler temperature will not be effective in removing dissolved CO
2
resulting in an incorrect and low CO
2
indication.
CHECK REBOILER TEMPERATURE
3. Nernst Electrode pH system failure will cause the two readings to disagree.
Electrode pH systems are more susceptible to failure than conductivity cells, and
depleted reference electrodes (incorrectly LOW readings) or broken measuring
electrodes (usually incorrectly HIGH readings) can occur.
CHECK pH ELECTRODE SYSTEM