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AB23PH Bench pH Meter
5.3
Electrode maintenance
Make sure the electrode is filled with electrolyte solution. Always store the electrode
according to the electrode instruction manuals and do not allow it to dry out.
If the electrode response becomes sluggish or the slope is not acceptable, try the
following:
Soak the electrode in 0.1M HCl for at least 8 hours.
For fat or oil contaminant, degrease the membrane with cotton wool soaked in
either acetone or a soap solution.
After electrode treatment, a new calibration should be performed. If the electrode slope
is still not acceptable, the electrode might need to be replaced.
5.4
Cleaning
WARNING: Electric Shock Hazard. Disconnect the equipment from
the power supply before cleaning.
Make sure that no liquid enters the interior of the instrument.
Attention: Do not use solvents, harsh chemicals, ammonia or
abrasive cleaning agents.
The housing may be cleaned with a cloth dampened with a mild detergent if necessary.
5.5
Self-diagnosis
When the meter is on, press and hold the Read/Enter button and the Cal button
simultaneously until the meter displays the full screen. Each icon blinks one after the
other.
This way you may check whether all icons are correctly shown. The next step is to
check that the buttons are functioning correctly. This requires user interaction.
When b blinks, six icons (including b) are displayed.
Press the six buttons in any order. Each time you press a button, an icon disappears
from the screen. Continue to press the other buttons until all the icons have
disappeared.
When the self-diagnosis has been completed successfully, PAS appears. If self-
diagnosis fails, error message Err 1 appears.
Note: You have to finish pressing all six buttons within 2 minutes, otherwise Err 1
appears and you will have to repeat the procedure.
5.6
Recover factory settings
When the meter is off, press and hold the Read/Enter button, Cal button and Exit
button together for 3 seconds, the screen displays
"Reset". There are 2 options:
Press the Read/Enter button to reset factory settings (MTC, slope and offset, etc.),
display
then restart the meter.
and blinks, this means
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