13
EN
Self-diagnosis information
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Contents
Checking
Wrong pH buffer solution or the
recognition of calibration solution out of
range
1.Check whether pH buffer solution is correct.
2.Check whether the meter connects the
electrode well.
3.Check whether the electrode is damaged.
Press
key when measuring value is not
stable during calibration.
Press
key
when
icon appears
During calibration, the measuring value is
not stable for ≥3min.
1.Check whether there are bubbles in glass
bulb.
2.Replace with new pH electrode.
Electrode zero electric potential out of
range (<-60mV or >60mV)
1.Check whether there are bubbles in glass
bulb.
2.Check whether pH buffer solution is correct.
3.Replace with new pH electrode.
Electrode slope out of range
（
<85%or >110%
）
pH measuring range out of range
（
<-2.00
pH or >16.00pH
）
1.Check whether the electrode is suspended.
2.Check whether the meter connects the
electrode well.
3.Check whether the electrode is damaged
Enter in pre-set due calibration to remind
due calibration
Press
key to perform calibration or cancel
due calibration setup per parameter P1.2
pH electrode maintenance
Daily maintenance
The soaking solution contained in the supplied protective bottle is used to maintain activation in the glass bulb
and junction. Loosen the capsule, remove the electrode and rinse in pure water before taking a measurement.
Insert the electrode and tighten the capsule after measurements to prevent the solution from leaking. If the soak
solution is turbid or moldy, replace the solution.
The electrode should not be soaked in pure water, protein solution or acid fluoride solution for long periods of
time. In addition, do not soak the electrode in organic silicon lipids.
For best accuracy, always keep the meter clean and dry, especially the meter’s electrode and electrode jack. Clean
with medical cotton and alcohol if necessary.
Calibration buffer solution
For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer solution should be
refreshed often, especially after heavy use.
Protect glass bulb
The sensitive glass bulb at the front of the combination electrode should not come in contact with hard surfaces.
Scratches or cracks on the electrode will cause inaccurate readings. Before and after each measurement, the
electrode should be washed with pure water and dried. Do not clean the glass bulb with a tissue for it will affect
the stability of the electrode potential and increase the response time. The electrode should be thoroughly
cleaned if a sample sticks to the electrode. Use a solvent if the solution does not appear clean after washing.
Regenerate glass bulb
Electrodes that have been used over a long period of time, will become ageing. Submerge the electrode in
0.1mol/L hydrochloric acid for 30 seconds, then wash the electrode in pure water, then submerge it in soaking
solution for 24 hours.
Summary of Contents for pH 70 Plus
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