blinks on the screen, which means it is restored to default settings. Press to back
to measuring mode.
4.9.3. Be careful to use this function, because all saved data will be removed once
restored to default settings.
5. Notes
5.1. Times to be calibrated depend on test sample, electrode and measurement
accuracy. For high accuracy test (≤±0.02pH), it should be calibrated in time with high
accuracy buffers. For normal accuracy measurements (≥ ±0.1pH), after being
calibrated one time, it can be used for one week or even longer.
5.2. The instrument should be calibrated again in the following situations.
5.2.1. For new electrode and the one that has not been used for a long time.
5.2.2. After testing strong acidic solution(pH<2) or strong alkaline solution(pH>12).
5.2.3. After testing fluoride solution or high concentration organic solution.
5.2.4. The temperature difference is big for the tested solution and calibration solution.
5.3. There is electrode immersion solution in the protection bottle where the electrode
probe is soaked and used to keep glass bulb moist and liquid interface activated. When
to use it, just rotate the bottle cap, take out the electrode and wash it clean. After use,
put it back to the bottle and tighten the bottle cap to prevent solution leaking. If the
immersion solution is turbid or mouldy, please clean the bottle in time and change
soaked liquid.
5.4. It is forbidden to be soaked long time in pure water, protein solution and acidic
fluoride solution, and no contact with organic fat.
5.5. In order to increase measurement accuracy, the pH value of the standard buffer
must be accurate which is used to calibrate the instrument.
5.6. Keep the instrument clean and dry, especially for the connection interfaces,
otherwise the measurements will not be accurate or wrong.
5.7. The glass bulb can’t touch solid things, any bulb damage will cause the electrode
failure. The electrode should be washed before and after using it, then wave or absorb
it dry, don’t wipe it with paper tissue which will make the electric potential unstable
and prolong response time. After the use in viscous sample, the electrode should be
washed for a few time in order to remove sample stuck to the surface, or use suitable
solvent to clean it.
5.8. After long use, the electrode will be passivated because the bulb is polluted or the
liquid interface is blocked, which will make the electrode sensitive gradient lower,
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