General Tools and Instruments DPHC2001 - Manual (Page 9)

4. PH CALIBRATION PROCEDURE
4-1 Calibration Consideration
The most ideal PH ELECTRODE generates 0 mV at PH
7.00 ( 177.4 mV at PH 4 ) and YK-2001PH has been
always calibrated with signals which simulate the most ideal
PH ELECTRODE ( based on 25蚓 ambient environment
). However not every PH ELECTRODE is as accurate as
the most ideal one, so calibration procedures are
necessary to be done before the first time measurement.
In addition to the first time measurement, users are also
recommended to execute the calibration procedures to
ensure the high accuracy measurement.
4-2 Required Equipments for Calibration
1) PH ELECTRODE ( optional ).
2) PH buffer solutions ( optional ).
4-3 Two Points Calibration Procedure
1) Power on the instrument by pressing the " Power
Button " ( 3-2, Fig. 1 ).
2) Press the " PH/mV Button " ( 3-6, Fig. 1 ) to let meter be
operated under the PH function with a " PH " symbol on the
display.
3) Adjust the " Temperature Compensation Value " to make
it same as the temperature value of the pH buffer
solution.
Manual temperature compensation value adjustment
procedure, please refer to 5-1 (Page 10).
Automatic temperature compensation value adjustment
procedure, please refer to 5-2 (Page 14).
7