pH 340/ION
Troubleshooting
62
Other possible errors - pH measurement
System message
Cause
Action
Voltage of pH
electrode not stable
pH electrode:
•
Diaphragm contaminated
•
Membrane contaminated
Sample solution:
•
pH value not stable
•
Temperature not stable
Ele sample
solution:
•
Conductivity too low
•
High temperature
•
Organic fluids
pH electrode:
Clean diaphragm
Clean membrane
Sample solution:
Measure in an airproof vessel
if necessary
Temper if necessary
Ele sample solution:
Use suitable pH electrode
Use suitable pH electrode
Use suitable pH electrode
Measured values
obviously wrong
pH electrode:
•
Unsuitable pH electrode
•
Temperature difference
between calibration and
sample solution too high
•
Interference voltages
•
Unsuitable measuring
procedure
pH electrode:
Select suitable pH electrode
Temper buffer or sample
solution
With grounded sample solution
do not use a grounded PC or
printer
Pay attention to special
procedures
Summary of Contents for pH 340/ION
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Page 81: ...Technische Daten pH 340 ION 81 Pr fzertifikat EMV...
Page 87: ...Technical data pH 340 ION 87 Test certificate EMC...
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