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5.5.9. The lifespan period for the 201T-S pH Electrode is about 1-1.5 year, but its life will be
shortened if the meter is used incorrectly or is not well maintenained. be sure to replace the
electrode once it has aged or tested inaccurately
5.5.10. When an abnormal reading appears during calibration or measurement, please set P7 to
“
ON
”
to restore the meter to Factory Default settings, then re-calibrate the meter before
measurement.
5.6
The Self-diagnose Information
When using the meter, the following icons might appear. This is the meter’s self-diagnose
information, which helps users identify problems occurring with the meter or the electrode when
using:
5.6.1. The stable icon of -2.00 pH or 19.99 pH — this icon appears 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.
5.6.2.
“Err1”
— Abnormal electrode zero potential (<-60mV or >60mV)
5.6.3.
“Err2”
— Abnormal electrode slope (< 85% or >105%)
When
“Err1”
or
“Err2”
appears, the meter can not work properly, please take the following
steps to check and fix the problem:
(a) Check if the electrode bulb has air bubble, if has, please shake the electrode with force for a
few times to eliminate the air bubble inside the sensor.
(b) Check the quality of buffer solution, if it is expired or contaminated. If so, please replace
with new ones.
(c) Set the meter to factory default mode then recalibrate it.
If the meter still can not recover to the normal state after doing the above steps, please replace a new
pH electrode.
6
mV Measurement
6.1
Sample Test
6.1.1. Press key to turn on, and short press
to switch to
mV
mode;
