Accumet XL 20 User Manual page 124

To standardize the meter with Manual Buffer Recognition
The Manual mode requires a minimum two-point calibration. When you press the Enter key after
the first calibration point, a message appears: "Minimum 2 buffers need to be standardized to
apply the standardization in measurement'.
1. Make sure Manual 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 each beaker icon once, then a numberic keypad will appear. Using
the displayed keypad input the value of the buffer that you are using to standardize the
meter and then touch Enter. The meter now shows the buffer value in the flashing beaker.
6. When the reading is stable, STABLE appears on the screen. Touch Confirm to standardize
the buffer. The meter will then 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.
If there is no previous standardization, there is no need to click the Clear button. If your
meter already has a calibration in the memory, use the Clear button if you need to clear the
previous calibration values.
pH calibration screen with Manual
Buffer Recognition
pH Operation: Standardizing
XL15, 20, 25, 50 and 60 meters
Once meter is calibrated, pH Measure screen
shows standardized buffers and last
standardization time/date
113