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Robin Clark 2010-03-25 08:58:48 +00:00
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pt100/pt100.tex
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@ -372,7 +372,7 @@ hours of operation. This figure is referred to as a FIT\footnote{FIT values are
A thermistor, bead type, non military spec is given a FIT of 3150. A thermistor, bead type, non military spec is given a FIT of 3150.
Using the RIAC finding we can draw up the following table \ref{tab:stat_single}, Using the RIAC finding we can draw up the following table (table \ref{tab:stat_single}),
showing the FIT values for all faults considered. showing the FIT values for all faults considered.
@ -405,6 +405,10 @@ test cases. The PT100 circuit here has a FIT of 3177.6.
A Probablistic tree can now be drawn, with a FIT value for the PT100 A Probablistic tree can now be drawn, with a FIT value for the PT100
circuit and FIT values for all the component fault modes that it was calculated from. circuit and FIT values for all the component fault modes that it was calculated from.
We can see from this that that the most likely fault is the thermistor going OPEN.
This circuit is 8 times more likely to fail in this way than in any other.
Were we to need a more reliable temperature sensor this would probably
be the fault~mode we would scrutinise first.
\begin{figure}[h+] \begin{figure}[h+]