User Manual PEAK INSTRUMENTS INC
Address: 16223 Park Row, Houston, TX-77084, USA. Website: www.peakii.com. Tel: +1 2819353455
response slow, reading inaccurate. The following methods could be used in different
situations.
5.8.1. The glass bulb is passivated: Soak the bulb in 0.1mol/L dilute hydrochloric
acid(add pure water into 9ml hydrochloric acid to 1000ml) for 24 hours, wash it with
pure water, then soak it in electrode immersion solution for 24 hours. If passivation is
serious, put the glass bulb in 4%HF (hydrofluoric acid) for 3-5 seconds, wash it with
pure water, then soak it in electrode immersion solution for 24 hours.
5.8.2. Reference cleaning of glass bulb and liquid interface.
5.9. pH electrode can usually be used for one year, if the working conditions are very
bad, being misused or in improper maintenance, its lifespan will be shortened. If the
electrode is passivated or not working well, please replace it.
5.10. When the instrument is abnormal, please set P7 and restore default settings,
then do the calibration and test.
6. Self-diagnosis information
The following symbols may appear during daily use, it is the self-diagnosis information
which helps you understand some problems of the electrode or instrument.
6.1. Static -2.00 pH or -19.99pH means the measured value exceeds its measuring
range. When electrode is not connected properly or in the air, it could happen and is
normal.
6.2. “ ” means electrode zero potential is excess(<-60mv or >60mv).
6.3. “ ” means electrode slope is excess(<50% or >105%). When the above error
symbols appear, please do the following examinations.
6.3.1. Check if there are bubbles in the electrode bulb, if yes, please wave them away.
6.3.2. Check if the buffers spoil or there is big error for the buffers.
6.3.3. Restore the instrument to default settings and recalibrate it.
If the above methods can’t solve the problems, please change the pH electrode.
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