NAVI D-25 Instruction Manual page 170

● ERR No.04 Asymmetric potential error
D-52/53/54/55
Explanation
The asymmetric potential of the electrode is 45 mV or
more.
Cause
The electrode is
dirty.
The electrode is
cracked.
The reference
solution
concentration is
fluctuating.
The electrode is
not connected
correctly.
The electrode is
not submerged
deeply enough to
cover the liquid
junction (tip).
There is problem
with the standard
solution.
6 Maintenance and Troubleshooting
How to solve problem
Wash the electrode.
Replace the electrode.
Replace the internal solution in the
reference electrode.
Connect the electrode correctly.
Immerse the electrode in the
sample at least three centimeters
deep.
Prepare new standard solution.
6.5 Troubleshooting
159