horiba LAQUA F-71G, Instruction Manual

Page: 64 / 102

Chapter 3 Basic Operation
3.3 Calibration
46
Electrode status
You can check the electrode status after calibration.
●
Calibration with CUST screen
Up to 5 points can be calibrated using performed using
desired standard solutions.
1.
Prepare the pH electrode. Wash the pH electrode
with pure water (deionized), and wipe it off by filter
paper or tissue paper.
2.
Open the filler port of the internal solution. During
the calibration, the filler port should be kept open.
3.
Immerse the pH electrode in the desired standard
solution to calibrate the first point.
Display Description
,ERR
No display
Good condition.
Electrode sensitivity: 93% to 100%
Blinks
Electrode sensitivity: 90% to 93%
・ Check that the standard solutions are
correct.
・
Wash the electrode.
"
●
Washing electrodes" P.65
Lights up
Electrode sensitivity: 85% to 90%
"
●
ERROR No.0005 Span calibration
error (pH)" P.69
ERROR
No.0004
It is the asymmetry potential error.
"
●
ERROR No.0004 Zero calibration
error" P.68
ERROR
No.0005
It is the sensitivity error.
"
●
ERROR No.0005 Span calibration
error (pH)" P.69