2.7
Influence of the filling procedure on the accuracy of the test
During the filling procedure the
decline of the hydrogen
concentration is detected. This
decline is used by the software to
detect the minimum sensor signal
(signal at zero hydrogen content).
This value is subtracted from the
signal value obtained during the
test. By doing so, any zero-drift of
the sensor electronics is
compensated.
This procedure can work only if a
decline of the hydrogen
concentration is detectable during
the filling of the reactor.
Otherwise there will be serious
errors in the calculation of the
zero-value and thus in the final
result.
So the concentration can only be detected correctly when the curve follow a certain form. To
give an indication if this happens, the background of the diagram turns from red to green is
the curve behaves properly. Otherwise, the background remains 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 70 seconds (this allows the
hydrogen to evaporate completely)
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