General Tools and Instruments DCT2001 - Manual (Page 16)

f. Two Points Calibration
PH 7 calibration
Connect the PH ELECTRODE with the " BNC socket "
( 3-10, Fig. 1 ) and immerse the electrode in the PH7
buffer solution ( optional ).
Press the " CAL Button " ( 3-7, Fig. 1 ) then the upper
display shows texts of " CAL " and the lower display
shows the default calibration value.
* The texts " CAL " will flash for around 5 seconds.
After that, the meter calibrates itself automatically.
The upper display will show the calibrated value,
the lower display will show the temperature value.
PH 4 or PH 10 calibration
1) Rinse the electrode with distilled water.
2) Immerse the electrode in the PH4 buffer solution ( or PH10
buffer solution ).
3) Press the " CAL Button " ( 3-7, Fig. 1 ) then the upper
display shows texts of " CAL " and the lower display
shows the default calibration value.
* The texts " CAL " will flash for around 5 seconds.
After that, the meter calibrate itself automatically.
The upper display will show the calibrated value,
the lower display will show the temperature value.
4) Rinse the electrode with distilled water again and then
5) Repeat above (2) to (4) procedures two times at least.
6) The instrument and electrode are now finished the
" TWO POINTS CALIBRATION " & ready for the
measurement.
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