YSI 5000 - Manual (Page 35)

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7.2 Application Mode
The YSI Model 5100 DO instrument contains built-in application software for the calculation of
Oxygen Uptake Rate (OUR) and Specific Oxygen Uptake Rate (SOUR). These application
features may simplify compliance with USEPA 40 CFR Part 503 regulations for vector attraction
and provide useful tools for plant operation decisions. With the Model 5100 complete sets of
data from five OUR tests and five SOUR tests can be stored to memory and later reviewed.
From the Main mode, press the [MODE] key to enter the Application mode. The bottom row of
the display shows the soft-key menu of the Model 5100. The Model 5000 does not support OUR
or SOUR applications. The 5000 does, however, support Remote mode which allows the
instrument to be controlled via computer.
8.99
*
mg
/L
23.22°C 11:01
AM
OUR SOUR REMOTE
OUR
The 5100 uses the following formula to calculate the OUR value:
OUR
=
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
= Dilution factor of sample (entered in setup screen as Sample / Total)
DO
START
- DO
END
T
ELAPSED
mg/L/h
3600 Sec
1 Hour Total
Volume
Sample
Volume
x x =
Total Volume
Sample Volume
Application