User Manual

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4.5.10. The sensitive glass bulb in 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, wash the electrode with pure water and then
throw off the excess water on the electrode. Do not rub 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 there are residuals on the electrode. Use a solvent if the
solution does not appear clean after washing.
4.5.11. The life span of a pH electrode is about 1-2 years. This will be shortened if used in
extreme condition or improper maintained. The ageing and invalid electrode should be
replaced in time.
4.5.12. If the calibration or display of the meter occurs abnormal, please set P6 to be On
to restore to factory setting and calibrated again.
4.5.13. Please do not disconnect the power when the meter is on. Once the meter is turned
off it is safe to unplug.
3.9 Self-diagnostic Information
In the process of using, some icons might appear. This is the self-diagnosis for the meter,
which will help to understand the problems of the meter or electrode during using:
4.6.1. The stationary- 2.00 pH or 19.99 pH icon this means the measurements
have exceeded the measuring range. If the meter is not properly connected with the
electrode or the electrode doesnt immerge into the solution, such icons will also appear.
4.6.2. Electrode zero potential is exceeded (<-60mV or >60mV)
4.6.3. Electrode slope is exceeded (< 85% or >105%)
4.6.4. When or appears on the upper right corner, the meter will
not work normally, please check the following: