Metrohm 756 KF Coulometer - Manual (Page 112)

5.1 Troubleshooting
756/831 KF Coulometer, Instructions for Use 104
Problem Possible causes and remedies
Result too low • Drift correction too large, i.e. the drift was too high at the
start or unstable drift.
• Stop drift too high.
• Min.rate too low
• Sample releases iodine.
Results widely scattered • Inhomogeneous sample? Poor reproducibility of sample
addition?
• Drift unstable.
Titration times too long • Wait until drift during conditioning becomes stable.
• Amount of water too large, see sample size guidelines on
page 10.
• Set stop drift higher.
• Set control range smaller, set max.rate higher.