Extech Instruments DO700 User Manual page 7

Testing the pH of a Sample
1. Perform the pH Calibratoin as described above
2. Rinse and dry the pH Probe and submerge it in a sample liquid
3. Stir the solution briefly with the probe and allow it to stand until the display stabilizes
4. Note that the closer the temperature of the sample solution to the calibration solution, the more
accurate readings
Programming pH Parameters
The Table below shows the available programming menu items P1 ~ P7. Each parameter is
explained in detail in the subsequent sections.
Parameters
P1 pH buffer solution series selection
Distilled water pH temperature
P2 compensation setting (see notes
below this Table)
Distilled water with Ammonia pH
P3 temperature compensation setting
(see Notes below this Table)
P4 Temperature unit setting
P5 Back light display time setting
P6 Auto power off setting
P7 Restore to default factory settings
Notes on P2 and P3 Parameters: Measurements of distilled water and distilled water mixed with
ammonia affect the temperature compensation and the slope linearity of the pH probe. Such
measurements are sometimes used in the electrical power and petrochemical industries. Set these
parameters to ON only if necessary, otherwise leave these parameters in the OFF state.
Code Selections
USA (Europe &
U.S.A)
s ol
NIS (NIST)
CH (China)
OFF / ON
OFF / ON
0-1-3-6min
0-10-20min
OFF / ON
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