Instruction Manual
PD 300
To Calibrate pH:
1. If necessary, press the
MODE
key to select
pH mode. The pH indicator appears in the
upper right hand corner of the display.
2. Rinse the probe thoroughly with de-ionised
water or a rinse solution. Do not wipe the
probe; this causes a build-up of electrostatic
charge on the glass surface.
3. Dip the probe into the calibration buffer. The
end of the probe must be completely
immersed into the sample. Stir the probe
gently to create a homogeneous sample.
NOTE
The temperature element is in the DO electrode. For
temperature compensated readings, dip the DO
electrode into the calibration buffer as well.
4. Press
CAL/MEAS
to enter pH calibration
mode. The CAL indicator will be shown. The
primary display will show the measured
reading while the smaller secondary display
will indicate the pH standard buffer solution.
5. Wait for the measured pH value to stabilise.
See Figure 5.
6. Press
ENTER
to confirm calibration. The
meter is now calibrated to the current buffer.
The lower display scrolls through the
remaining buffer options.
•
For multi-point calibration, go to step 7.
•
For one-point calibration, go to step 9.
Figure 6: pH Calibration
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