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Performing a Test
2.7
Influence of the filling procedure on the accuracy of the test
During the opening phase, the minimum voltage ("zero value") of the sensor is determined via
the drop in the hydrogen concentration (arrow).
This zero value should always reach ± 5% as soon as you have opened the instrument and
removed the sample tray and the reagent tray or test pad.
The concentration curve usually has a specific behavior (first strongly sloping and then flat
out). To give the user an indication that the curve is showing the correct behavior, the
background of the diagram changes from red to green. Otherwise, the background will remain
red.
To obtain a proper test result it is therefore necessary that
1) the reactor will not be opened before the pictures of the filling procedure are shown
on the screen
2) the period when the reactor is open is not less than 15 seconds (this allows the
hydrogen to evaporate completely)
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