Ionode IJ pH V5.1 - Manual (Page 28)

Ionode IJ Instruction Manual 28
Symptom Possible
Causes
Remedy
Low Slope
(<94%) Contaminated
Buffers Replace buffers
Membrane
not Clean See 4.6
Troubleshooting
Drift
Membrane
Aged Allow more time for
stabilisation, or
replace
Electrode
Polarised Replace electrode
Slow
Response Membrane
not Clean See 4.6
Troubleshooting
Drift
Membrane
Aged Allow more time for
stabilisation, or
replace
Incorrect
Sample
Reading
after
successful
calibration Ground Loop.
Often Occurs
in Process
Systems Verify by removing
the sample from its
environment and
measuring in a glass
beaker. May require
special circuitry.
Junction
Blocked or
unclean See 4.6
Troubleshooting
Drift
Displays
pH7 for all
Buffers Electrical
Short Check connector
Internal Short Replace electrode
Displays
pH4-5 for
all Buffers Membrane or
Stem
Cracked Replace electrode