Accumet XL 20, User Manual, Page: 123 / 199

112
pH Operation:
Standardizing
XL15, 20, 25, 50 and 60 meters
To Standardize the meter with Auto Buffer Recognition
1. Make sure Auto Buffer Recognition is selected in the Setup screen.
2. Immerse your rinsed electrode(s) and temperature probe in a buffer solution from the
selected buffer group that you chose during the pH setup process and stir gently. The
selected buffer group appears on the standardization screen.
3. Touch Standardize on the Channel 1, 2 or 3 pH measure screen to access the
standardization screen.
4. Touch Clear if necessary to delete all previous standardization values. If the screen says
“Not standardized” proceed to step 5.
5. The screen will flash a beaker icon of the buffer solution you have selected. When the
reading is sta
ble, STABLE appears on the screen.
6. Touch Confirm to standardize buffer. The meter will return to the pH measure screen.
7. Touch Standardize on the pH measure screen to access the standardization screen.
Repeat process to standardize with up to 5 buffers.
The efficiency of the electrode is reported as the slope. When doing a multi-point standardization,
the slopes of the individual segment are calculated by the meter. The slope that appears on the
screen is the slope applicable to that zone (in which the measurement is currently being made).
For optimal results, the meter should be standardized at a minimum of every 8 hours. For more
accurate measurements, the meter should be standardized more frequently.
If there is no previous standardization, there is no need to click the Clear button. If your
meter already has a calibration in memory, click Clear if you need to clear the previous
calibration values.
pH calibration screen with Auto Buffer
Recognition Once the meter is calibrated, the pH Measure
screen shows the buffers that have been
standardized and last standardization time/date