General Tools and Instruments DPHC2001 - Manual (Page 12)

4-5 Others
Above calibration procedures effect only when reading value
within 1 PH of the calibration point.
However if the reading value beyonds
* 1 PH of PH 7 ( > PH8, < PH6 )
* 1 PH of PH 4 ( > PH5, < PH3 )
* 1 PH of PH 10 ( > PH11, < PH9 )
the calibration procedures are :
1) Connect the PH ELECTRODE to the " PH BNC Input
Socket " ( 3-10, Fig. 1 ).
2) Power on the instrument by pressing the " Power
Button " ( 3-2, Fig. 1 ).
3) Press the " PH/mV Button " ( 3-6, Fig. 1 ) to select
the PH function with a "PH" symbol on the display
4) Set the " Manual temperature compensation " value to 25 蚓
refer to 5-1 calibration procedures, page 11.
5) Place the electrode into the standard solution ( PH7, PH4 or
PH10 ) , then the instrument will have the PH value on the
display.
6) * For measuring the PH7 standard solution, adjust the
PH 7 VR ( 3-15, Fig. 3 ) until the display value
within PH6 to PH8.
* For measuring the PH4 standard solution, adjust the
PH 4 VR ( 3-16, Fig. 3 ) until the display value
within PH3 to PH5.
* For measuring the PH10 standard solution, adjust the
PH 10 VR ( 3-16, Fig. 3 ) until the display value
within PH9 to PH11.
7) The following calibration procedures will be same as 4-3
( page 7 ) and 4-4 ( page 9 ).
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