16
4.5.9. pH electrode using period is about 1 year, but its life will be shortened if using
condition is poor or incorrect maintenance. So it should be replaced immediately after
electrode become aging or invalid.
4.5.10. When it appears an abnormal reading when calibration or displaying, please set P8 as
“
ON
”
to restore the meter to producer setting mode, and then to calibrate and
measure again.
4.6. The Self-diagnose Information:
When using, there might appear the following icons. This is the meter’s self-diagnose
information, which can help to know some information about the meter or the electrode
when using:
4.6.1. The stable icon -2.00 pH or the 19.99 pH
—
this icon appeared when the value has
surpassed the measuring range. There will also appear such signs when the electrode
is not well connected with the meter or when the electrode is not immerged into the
solution. This is a normal phenomenon.
4.6.2.
“
”
—
Electrode zero potential to be exceeded (<-60mV or >60mV)
4.6.3.
“
”
—
Electrode slope to be exceeded (< 50% or >105%)
When appear
“
”
or
“
”
, the meter can not work, please take the
following check:
(a) Check if the electrode bulb has air bubble, if has, please shake it hardly.
(b) Check the quality of buffer solution, if it goes bad or the value has biggish error.
(c) Set the meter to producer setting mode (for details see P12 item 4.4.9.), then
re-calibrate it.
If still can not recover the normal state after doing the above checking, please replace a
new pH electrode.