Accumet XL 20 User Manual page 148

Automatic standardization at one point—% Saturation
A one point automatic standardization for % saturation assumes the dissolved oxygen level is at
saturation (100% at 760 mm Hg). The meter will accept readings between 30 and 200%
saturation for standardization.
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 1 inch of water to provide a 100% relative
humidity environment.
5. Allow probe to stabilize for 30 minutes.
6. The screen will flash a 100% beaker icon. When the reading is stable, STABLE appears
on the screen. Touch Confirm to standardize. The meter will then return to the DO
measure screen.
Once meter is calibrated DO Measure screen shows the standard, the time/date of last
standardization and AUTO standard recognition.
It is important to prepare your DO probe according to the manufacturer's instructions prior
to use.
DO Operation: Standardizing
XL40 and 60 meters
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