20
The OUR is used to determine the oxygen consumption or respiration rate in water. It is defined as
the mg/L of oxygen consumed per hour.
The following equation is used for OUR determination:
where:
DO
START
= Dissolved oxygen level at start of test
DO
END
= Dissolved oxygen level at end of test
t
ELAPSED
= Elapsed time of test in seconds
total volume/sample volume = Dilution factor of sample
Before starting an OUR test remember to set the OUR configuration from the SETUP menu (page 30).
OUR measurement screen:
Press Start to begin a new OUR test.
If the DO value is less than the minimum start DO value the meter will display an error message, and
the test cannot be started.
If the minimum start DO condition is met the instrument will display the instantaneous oxygen
consumption rate and the amount of time that has passed from the beginning of the test.
If the DO reading is less than the minimum end DO value set during OUR configuration a warning icon
will be displayed and a beep will be heard every two seconds. Press Stop to stop the test and the beeper.
OUR MEASUREMENT
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