Accumet XL 20, User Manual, Page: 151 / 199

140
DO Operation:
Standardizing
XL40 and 60 meters
Manual standardization at one point—both % Saturation and mg/L
A one point manual standardization for % saturation and mg/L allows user to key in the value to
be used for standardization (at 760 mmHg). The meter will accept readings between ±50% of the
valued entered.
1. Touch Standardize on the DO measure screen to access the standardize screen.
2. If the screen says “ Not standardized ” proceed to step 4.
3. Touch Clear if you need to delete the previous standardization values
4. Insert DO probe into a BOD bottle filled with a solution of known saturation.
5. Allow probe to stabilize for 30 minutes, constantly stirring the solution.
6. The screen will flash a blank beaker icon for a few seconds, then a numeric keypad
appears. Use the alphanumeric keypad on the screen to enter desired value. The BS key
allows you to remove characters that are incorrectly entered.
7. Touch Enter on the keypad to accept the value and return to the DO standardization
screen.
8. The screen will flash a beaker icon with the entered value. When the reading is stable,
STABLE appears on the screen. Touch Confirm to standardize. The meter will then return
to the DO measure screen.
It is important to prepare your DO probe according to the manufacturer’s instructions
prior to use.
Once meter is
calibrated DO
Measure screen
shows the standard,
the time/date of last
standardization and
MANUAL standard
recognition.