Section 2 -
pH Calibration and Measurement
For accurate results, stir all buffers and samples. Always rinse electrodes and blot dry
before transferring from one solution to another to prevent contamination. Ensure that any
electrode filling holes are left uncovered during use.
Automatic Calibration & Temperature Compensation
1.
Connect the pH electrode(s) and temperature probe and switch on using the power
ON/OFF switch on the back panel.
2.
Select pH mode by pressing the pH/°C key. Note: A flashing display indicates that the
instrument is uncalibrated.
3.
Place the pH electrode(s) and the temperature probe in the pH 7 buffer and wait for a
stable reading. Indicated by
◄
on the display.
4.
Press the CAL key– CAL flag will flash. Press the 7pH key—CAL flag will stop flashing. The
first calibration point has now been entered automatically at the correct value for the
temperature of measurement.
5.
Rinse, blot and place electrode(s) and temperature probe in pH buffer 4 or 10. Wait for a
stable reading indicated by
◄
on the display.
6.
Press the CAL key– CAL flag will flash. Press the 4/10pH key—CAL flag will stop flashing.
The second calibration point has now been entered automatically at the correct
value for the temperature of measurement.
7.
pH measurements may now be made by immersing rinsed electrodes in the sample and
recording the stable reading indicated by the
◄
flag.
8.
To read the temperature press the pH/°C key at any time.
7pH
4/10pH
Cal
Send
pH/°C
Calibration Keys, automatically
selects and enters correct pH value
Starts calibration routine
Selects pH or temperature mode
Transmits data to printer or computer
Figure 3. Front Panel
