INE-PHS-3E 2016
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4.1.2 Manual calibration
(Be suitable for calibrating any standard buffer solution from pH0.00 to 14.00)
The step a) to e) is the same as the automatic calibration
One-point calibration
f) Insert the electrode which has been cleaned with distilled water into pH7.00
standard buffer solution. Press “Std” button once, the screen will display “Std yes”.
Press “Enter” button to enter calibration state, press any button to exit and return
the measuring state.
Press "
Ÿ
"or “
ź
” of “Std” button to adjust pH value larger or smaller according to
your need, and then press “Enter” button again to finish.
Two-point calibration
g) Prepare two standard buffer solutions. Insert the electrode which has been
cleaned with distilled water into pH4.00, press “Std” button once, the screen will
display “Std yes”. Press “Enter” button to enter calibration state, press any button
to exit and return the measuring state.
Press "
Ÿ
"or “
ź
” of “Std” button to adjust pH value larger or smaller according to
your need, and then press “Enter” button again to finish.
Insert the electrode which has been cleaned with distilled water into pH10.01,
press “Slope” button once, the screen will display “Std yes”. Press “Enter” button
to enter calibration state, press any button to exit and return the measuring state.
Enter the calibrating state, the meter recognizes the buffer automatically and
displays the pH value of standard buffer solution at this temperature. When the
value is stable, press "Enter" button to finish and return the measuring state.
4.1.3 Slope reset
If the slope is not correct, two ways could recover:
a) Calibrating the electrode again.
b) Under the measuring state, press “Enter” button more than 3 seconds, the
meter
displays “SYS rSt”, after a moment, screen blinks, press “Enter”, the meter
reset (slope=100%, E0=0 mV).
Notes:
Generally the buffer solution used for 1
st
calibration is pH 7.00 solution, for the
second calibration, use the solution that is close to pH value of measured
solution. If measured solution appears to be acidity, pH 4.01 buffer solution
should be selected;
if measured solution appears to be alkalinity, pH 10.01 buffer solution should be
selected. In general situation, the meter needn't re-calibrating within 24 hours.
4.2 pH measurement
The calibrated meter (at the pH measuring state) is used to measure the measured
solution.
If temperature electrode is connected to the meter, insert the temperature and pH
measuring electrode into measured solution, stir the solution with glass stick to make
