What To Do If; No Stable Measured Value; Error Message Calerror - Xylem SI Analytics Lab 855 Operating Manual

What to do if...

10 What to do if...
36
10.1 pH
More information and instructions on cleaning and exchange of
sensors are given in the documentation of your sensor.
10.1.1

No stable measured value

Cause
• Junction of the electrode contami-
nated
• Glass membrane of the electrode
contaminated
Cause
• pH value of the test sample not
stable
• Temperature of the test sample not
stable
10.1.2

Error message CalError

Cause
• The values determined for zero
point and slope of the electrode are
outside the allowed limits.
• Junction contaminated
• pH electrode broken
Remedy
• Clean the junction
• Clean the glass membrane
Remedy
• Measure with air excluded if neces-
sary
• Adjust temperature if necessary
Remedy
• Recalibrate
• Clean the junction
• Replace the pH electrode
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Lab 855
12/2017