Xylem WQL-pH pH DATALOGGERS User Manual
Page 36
Calibrating for pH measurements
WQL-pH
110
ba75821e01
10/2009
Calibration record
7
If you want to carry out a single-point calibration: Press Complete.
This completes the single-point calibration; the calibration record is
displayed (with the Nernst slope of -59.2 mV/pH at 25 °C).
Or continue with the two-point calibration:
8
Thoroughly rinse the logger and electrode with deionized water.
9
Immerse the logger in the second buffer solution.
10
Start the measurement with Continue.
The AutoRead running... note appears and the electrode voltage U
(mV) and temperature are displayed.
The calibration record with the value of the slope (mV/pH) and the
value of the asymmetry (mV) is displayed as soon as a stable value
is recognized.
11
Accept the calibration with Accept. The message Calibration
successful appears and the new calibration will now be used for
measurement.
If you press Cancel, the logger discards the new calibration and will
continue to use the previous calibration values.
Note
The calibration line is determined by linear regression.
Note
You can view the calibration records at any time (see section 5.4 V