Hach BODTrak, Instrument Manual, Page: 37 / 63

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3.2 Interpreting Test Results
If the test proceeds correctly, the display should produce a curve
similar to Curve A in Figure 4.
If such a curve does not occur, one or more of the following
problems may have occurred: bottle leak, time lag, high oxygen
demand, or nitrification. These potential problems are discussed
in detail in the next four sections.
3.2.1 Bottle Leak
A leak between the bottle cap and seal cup may cause readings
similar to those plotted as Curve B in Figure 4, or may cause no
response from the system. If such a response to BOD changes
occurs, check for dirt inside the bottle cap and under the seal cup.
Figure 4 Example of BOD Curves
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