LABEC M-PL-600 - Manual (Page 11)

Remarks：After 1 point calibration, only the zero potential of the
sensor is modified （Offset），the slope of the pH sensor is kept from last
calibration. Even to those electrodes which have good performances,
0.05pH measurement error could be reached during measurement.
2 points calibration
After 1 point calibration, LCD
disp hes),
few
2 points
the
nt to
”
h rator.
lays as above chart (“Cal2”flas
immerse the electrode into standard
buffer solution, shaking the vessel for
minutes, wait for second, press“CA L”，
the
instrument will recognize which buffer
it the instrument judge pH sensor
response to ending point, the instrument displays as above chart,
calibration has been accomplished, automatically enter the pH
measurement mode, the display shows below, “Cal3”flashes，
instrument reminds you 1 point
calibration is finished, do you wa
proceed 3 points calibration? If only 2
point calibration needed, press “READ
to exit calibration process, switch to pH
measurement mode. If the 3 points
apter should be followed by the ope
solution is it, display as well, wa
calibration is needed, the next c
Remarks: After 2 points calibration, the instrument will modify the
offset and slope of the electrode。PH measurement under this kind of
calibration status, the measurement precision is quite good.
3 points calibration
After 2 point calibration, LCD
disp hes),
.18
lays as above chart (“Cal3”flas
immerse the electrode into third
standard buffer solution(e.g. PH9
Buffer), shaking the vessel for few
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