NAVI F-52, Instruction Manual

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Chapter 15 Maintenance and troubleshooting
15.2 Troubleshooting
F-52, 53, 54, 55 203
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ERR No.04 There is an error with the asymmetry potential
Definition
The asymmetry potential of the electrode is
out of 45 mV or more.
●
ERR No.05 There is an error in electrode sensitivity (pH)
Definition
The electrode sensitivity is either 105% or
more or 85% or less than the theoretical sen-
sitivity.
Cause How to solve problem
The electrode is dirty. Wash the electrode.
The electrode is
cracked. Replace the electrode.
The standard solution
concentration is fluctu-
ating. Replace the internal solution in the reference
electrode.
The electrode is not
connected correctly. Connect the electrode correctly.
Electrode is not sub-
merged deeply enough
to cover reference
junction. Immerse the electrode in the sample, to at
least 3 cm beyond the electrode tip.
There is problem with
the standard buffers. Prepare the standard buffer anew.
Cause How to solve problem
The electrode is dirty. Wash the electrode.
The electrode is
cracked. Replace the electrode.
Calibration was not
performed correctly. Redo the calibration correctly.
There is a problem
with the standard solu-
tion. Prepare the standard solution anew.
The electrode is not
connected correctly. Connect the electrode correctly.
Electrode is not sub-
merged deeply enough
to cover reference
junction. Immerse the electrode in the sample, to at
least three centimeters beyond the electrode
tip.