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(c) Press
key to enter into next parameter setting or press
key to confirm and
return to measuring mode.
(d) The producer setting for P6 is 10min.
5.4.8. Restore to producer setting (P7)
(a) Short press
key in mode P6 to enter into mode P7, see
picture (4-8).
(b) Press or key to choose
“ ON”
, means that all the
pH measuring parameters have been restored to the factory
default setting.
5.5
Special Notes
5.5.1. The frequency that you need to calibrate your meter depends on the tested samples, performace
of electrodes, and the requirement of the accuracy. For high-accuracy meaustements (≤ ±0.02pH), the
meter should be calibrated before test every time; For ordinary-accuracy measurements (≥±0.1pH),
once calibrated, the meter can be used for about a week or longer. In the following cases, the meter
must be re-calibrated before testing:
a)
The electrode hasn’t been used for a long time or a new electrode is connected.
b)
After measuring strong acid (pH<2) or strong base (pH>12) solutions.
c)
After measuring fluoride-containing solution and strong organic solution
d)
There is a significant difference between the temperature of the test sample and the temperature
of the buffer solution that is used in the last calibration.
5.5.2. 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 distilled water
before taking a measurement. Insert the electrode and tighten the capsule after measurements to
prevent the solution from leaking. If the soaking solution is turbid or moldy, replace the KCL solution
(Product# AI1107).
5.5.3. For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer
solution should be refreshed often, especially after heavy use. We recommend 10-15 times of use
before replacing the pH buffers.
