4. pH CALIBRATING PROCEDURE
4-1 Calibrating Consideration
The pH meter already calibrated by mV signal that
simulated from the ideal pH ELECTRODE mV output
( base on 25 environment ). However due to (a) An℃
ideal electrode will produce 0 mV at pH 7.00, but most
electrodes are slightly off. (b) The measuring environment
temperature may not near 25 ( 15 to 35 ). ℃℃
If intend to keep instrument combined electrode within
high accuracy, it is necessary to make the following
calibration procedures ( 4-3 ).
* Basic calibration ( single point calibration ) :
pH 7 calibration.
* Complete calibration ( two points calibration ) :
pH 7 calibration and pH 4 calibration.
* During execute the calibration procedures,
if the Display show " Error " information, then please
do the " Calibration clear " procedures, refer page 8.
4-2 Requiring Equipment for Calibration
1)Combination pH electrode ( PE-12, included ).
2)Buffer solutions :
pH 7.00 buffer solution ( PH-07A, included ).
pH 4.00 buffer solution ( PH-04A, included ).
4-3 Calibration procedures
pH 7 calibration
1)Rinse the electrode in distilled water.
2)Power on the instrument by pressing the " Power button "
( 3-2, Fig. 1 ).
3)Press the " Hold button " ( 3-3, Fig. 1 ) once.
the display will show the " HOLD " symbol.
Press the " button " ( 3-4, Fig. 1 ) once, the display▼
will show following screen in sequence.
5
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