Accumet XL 20 User Manual page 150

Automatic standardization at one point—mg/L
A one point automatic standardization for
mg/L assumes the dissolved oxygen level
is at saturation (8.26 mg/L at 0 ppt salinity,
25.0 °C and 760 mmHg). The meter will
accept readings ±50% of the standard
value.
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 8.26 mg/L
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.
Automatic standardization at two points—mg/L
For two point automatic standardization, the 0 mg/L must be the first standardization point
followed by 8.26 mg/L (at 0 ppt salinity, 25.0 °C and 760 mmHg). The meter will accept readings
below 1 mg/L for 0 mg/L standardization and ±50% of the next standard value.
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 bottle containing 0 mg/L solution.
5. Allow probe to stabilize for 30 minutes, constantly stirring the solution.
6. The screen will flash a 0mg/L 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.
7. Touch Standardize on the DO measure screen to access the standardize screen.
8. Insert DO probe into a BOD bottle filled with 1 inch of water to provide a 100% relative
humidity environment.
9. Allow probe to stabilize for 30 minutes.
10. The screen will flash a 8.26 mg/L beaker icon next to the 0 mg/L 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.
DO Operation: Standardizing
XL40 and 60 meters
Once meter is calibrated DO Measure screen
shows the standard, the time/date of last
standardization and AUTO standard
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