Instruction Manual

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reliable. Buffer solution should be changed after 10-15 times of calibrating.
6) Keep the meter clean and dry; especially the electrode and the socket of the electrode.
Failure to do so may lead to an inaccurate measurement or invalidity. Clean stains with
medical cotton and absolute alcohol and blow-dry afterwards.
7) The sensitive glass bulb in front of the combination electrode should not come in contact
with hard surfaces (they might get broken). Scratches or cracks on the electrode will cause
inaccurate readings. Before and after each measurement, rinse the electrode with distilled
water and then throw off 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
soap water and a soft brush if necessary.
8) The life span of pH electrode is about 1-2 years. This will be shortened if used in extreme
condition or improperly maintained. The aged and invalid electrode should be replaced in
time.
9) If the calibration or display of the meter occurs abnormal, please set P6 to be “On”
to restore to factory setting and perform calibration again.
10) Please don’t disconnect the power plug until the meter is turned off. Disconnecting power
when meter is still on will cause damage to the meter.
5.7 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 usage:
5.7.1. The stationary“- 2.00 pH” or “ 19.99 pH ” icon — this means the measurements
has exceeded the measuring range. If the meter is not properly connected with the electrode
or the electrode is not immerged into the solution, such icons will also appear.
5.7.2. — Electrode zero potential is exceeded (<-60mV or >60mV)
5.7.3. — Electrode slope is exceeded (< 85% or >105%)
5.7.4. When or appears on the upper right corner, the meter will not work
normally, please check as following:
(a) Check the electrode bulb and see if there are any air bubbles. If any are present, shake
the electrode with your wrist unitl the bubbles have been removed. Be sure to have a firm
grip when doing so.
(b) Check the pH buffer solution and see if it goes bad or has bigger error.
(c) Restore the meter to factory setting mode, then recalibrate it. If the sensor doesn’t work
after the above checks, please replace the pH electrode.