LaMotte pH PLUS Direct Meter User Manual
Page 16
3.3.1 Multi-point Ion Calibration
1.
If a calibration with a 1.0 ppm standard is desired, the 0.1 ppm calibration
can be skipped (see below*).
2.
For instance if a 1.0 ppm calibration standard is used, pour a known 1.0
ppm standard solution into a clean container. Power on the meter, and set
the meter to Ion measurement mode.
3.
Dip the ISE into the 1.0 ppm standard solution. Stir it gently. Press
CAL
key to enter into calibration mode.
4.
The display shows “
CA” momentarily followed by “0.1” flashing.
* If you wish to calibrate with a standard other than 0.1 ppm, press
q key
once to select 1.0 ppm. Use the
p or q key to select other options like 0.1,
10.0 or 100.0 ppm.
5.
Press the
ENTER key and the displayed value will show the corresponding
measured mV reading that is equivalent to 1.0 ppm. Allow the reading to
stabilize.
6. Press the
ENTER key to confirm the first calibration point (e.g. 1.0 ppm).
The display will show the next calibration option, 10.0 ppm. Rinse the
electrode with distilled water and blot it dry if necessary.
7. Pour a known 10.0 ppm standard solution into another clean container.
Dip the electrode into the standard solution. Stir it gently.
8. Press the
ENTER key and the displayed value will show the measured mV
reading that is equivalent to 10.0 ppm. Allow the reading to stabilize.
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