| Measurement using OxiTop® is based on pressure measurement
in a closed system: microorganisms in the sample
consume the oxygen and form CO2. This is absorbed by
NaOH, creating a vacuum which can be read directly as a
measured value in mg/l BOD.
The used sample volume regulates the amount of oxygen
available for a complete BOD. Measure ment ranges of up
to 4,000 mg/l can be measured using different volumes.
The OxiTop® heads (green and yellow for differentiation of
inflow/outflow) have an AutoTemp function: if the sample
temperature is too cold, the start of measurement is automatically
delayed (by at least 1 hour) until a constant temperature
has been reached.
Apart from the automatic storage of 5 measured values
(1 value per day), further measured values can be read at
all times during or after the period of 5 days, which permits
the tracking of check values or measurements over
longer periods. |
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