BioPAT
®
Trace | Multi Trace Operating Instructions 33
Design and Function
4.3 Conductivity Cell Function
The conductivity cell contains biosensors for
glucose and lactate or methanol/ethanol. The
conductivity cell is shown in the figure on the left.
The fluid inlet flow runs perpendicular to the
2-channel sensor (“wall jet” principle). It is
possible to check that the flow through the cells
is free from air bubbles by using the viewing
window. Any air bubbles can be removed as
necessary by rinsing the measuring chamber.
Forthat purpose, the fluid is injected through the
rinsing line equipped with a return valve.
Contact springs intercept the electric signal
measurable at the electrodes and transmit it to
the BioPAT
®
Trace | Multi Trace. The conductivity
cell is fastened to the device with a knurled nut.
CAUTION
Inaccurate measurement result due to air bubbles!
It must be ensured that there are no air bubbles in the measuring chamber of
the flow cell, as they can distort the results.
After connecting the sampling probe and before starting each measurement
series, check the conductivity cell for air bubbles through the viewing window.
As a general rule, air bubbles in the tubing set are flushed out over time.
However, this process takes a certain amount of time (e.g. during the priming
process).
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