Xylem CG 843 - Manual (Page 60)

What to do if...
128
Buffer solutions:
– Incorrect buffer solutions – Change calibration
procedure
– Buffer solutions too old – Only use once.
Note the shelf life
– Buffer solutions depleted – Change solutions
Cause Remedy
pH electrode:
– Diaphragm contaminated – Clean diaphragm
– Membrane contaminated – Clean membrane
Sample:
– pH value not stable – Measure with air
excluded if necessary
– Temperature not stable – Adjust temperature if
necessary
Electrode + sample:
– Conductivity too low – Use suitable electrode
– Temperature too high – Use suitable electrode
– Organic liquids – Use suitable electrode
Cause Remedy
– Calibrating interval
expired
– Newly calibrate measuring
system
No stable
measured value
Sensor symbol
flashes