4
5.
Maintenance
In addition to the good construction of the meter, proper maintenance is also an
essential factor effecting the performance of the meter, especially for this kind
of acid meter. With very high input impedance and frequently contact with
chemicals due to its working environment. Therefore, good maintenance is
necessary for this pH meter.
5.1.The input end of the meter (i.e. the socket of the combination electrode)
shall be kept clean. The plug of the electrode shall not be disengaged very
often, to prevent dust or moisture from entering the plug.
5.2 The tip end of the electrode is quite thin. Be sure not to hit the tip end on any
hard material to avoid damage.
5.3 Keep the tip end of the electrode away from dirts. In case it is found
contaminated, clean it with medical cotton or with 0.1mol/L diluted
hydrochloric acid.
5.4 If the end of the electrode is found to have cracks or become aged (stored for
over 2 years), it is necessary to change a new electrode. Or slow reaction
will happen, Or even results in big measuring error. Do remember the new
electrode shall be immersed in distilled water for at least 24 hours before
being mounted.
5.5 In calibrating the meter with buffering solution, it is important to ensure the
reliability of the solution, as low accuracy of the solution will surely results
in error in measuring result.
5.6 When a symbol “LOBAT” is shown on upper left corner of the display, it
means to replace the battery.
5.7 Be sure to avoid strong and direct sunshine on the display for obtaining
maximum life. Take care not to hit the display on any hard object, or touch
the screen glass to avoid scratching.
5.8 Please remove the batteries if they will not be used again for a long.
