Accumet XL 20 User Manual page 146

The XL40 and XL60 meters allow you to measure DO, BOD, OUR and SOUR. Each mode is
independent from one another and needs to be standardized separately. However the basic
procedure for standardization is similar for each mode. This manual will focus on DO
standardization.
Since each measurement mode differs there will be separate measurement sections for each:
DO measure dissolved oxygen, BOD measures Biochemical Oxygen Demand, OUR measures
Oxygen Uptake Rate and SOUR measures Specific Oxygen Uptake Rate. The DO and BOD
mode can measure in % Saturation, mg/L or mbar (see Setup section to choose).
Before measuring DO, BOD, OUR or SOUR, you will need to standardize the meter using
standards with known % Saturation or mg/L. This meter can perform a one- or two-point
standardization. You will need to set your meter to one- or two-point calibration in the Setup mode
for DO or BOD (OUR and SOUR can only calibrated at one point in mg/L). You also have to use
the Setup mode set Auto or Manual calibration (available for all measuring modes). The %
Saturation measuring units has the following options to set: Auto calibration and one point (100%
saturation), Auto calibration and two point (0 and 100% saturation), and Manual calibration and
one point (input by user). The mg/L measuring units has the following options to set: Auto
calibration and one point (8.26 mg/L) and Manual calibration and one point (input by user). There
are no calibration options for mbar measuring units.
The meter will continually monitor the DO (BOD, OUR or SOUR) reading in this mode and will not
lock onto a single reading. However, once the reading has become stable, STABLE will be
displayed (unless the Stable indicator has been turned OFF in the Setup mode). Remember to
setup your measuring mode parameters; refer to DO Setup section for instructions.
DO Operation
XL40 and 60 meters
DO measure screen
without standardization
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