Hanna Instruments HI 98186 - Manual (Page 21)

21
OUR MEASUREMENT OUR MEASUREMENT OUR MEASUREMENT OUR MEASUREMENT OUR MEASUREMENT
The OUR is used to determine the oxygen consumption or respiration rate. 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 33).
OUR measure 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.