Xylem inoLab 7110 WASTEWATER pH METER - Manual (Page 38)

What to do if... pH 7110
38 ba75925e02 12/2011
10 What to do if...
10.1 pH
10.1.1 No stable measured value
10.1.2 Error message CalError
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
Cause Remedy
• Junction of the electrode contami-
nated
• Clean the junction
• Glass membrane of the electrode
contaminated
• Clean the glass membrane
Cause Remedy
• pH value of the test sample not
stable
• Measure with air excluded if
necessary
• Temperature of the test sample
not stable
• Adjust temperature if necessary
Cause Remedy
• The values determined for zero
point and slope of the electrode
are outside the allowed limits.
• Recalibrate
• Junction contaminated • Clean the junction
• pH electrode broken • Replace the pH electrode