Casestudie Breakdown prediction Contell PILOT - Transumo

a centralized one. An isolated application is characterized by using its own features
to raise an alarm, like built-in flashlights or sirens. A centralized application (e.g.
XiltriX) transfers information of critical situations to a centralized unit that displays the
current status of all monitored devices at one place.
The third kind of temperature monitoring is an extension to the just presented one.
Besides comparing actual temperature values to predefined intervals, temperature
sequences of the single devices are stored. Again, this kind of temperature
monitoring can be implemented as an isolated application as well as a centralized
one. The gained historical temperature sequences enable data analysis in retrospect
to obtain changes in behavior over time.
Up to now, this data analysis is kept very simple. Beside basic visualization
possibilities to evaluate the behavior manually or some provided statistical measures,
current temperature monitoring products in the market do not contain more complex
analyzing methods. 6
Hence, the main task of this diploma thesis is to find additional analyzing methods to
offer more precise status information of monitored cooling devices. To be able to do
that, the next section will identify problems and potential sources of error, current
sensor based temperature monitoring is faced with.
2.4 Problems and Potential Sources of Error
Data analysis (e. g. statistics) can lead to two different kinds of error
([Scharnbacher04], p. 85):
1. Error of first kind
2. Error of second kind
Based on a null hypothesis (H 0 = Cooling device is OK), four different cases are
possible as pictured in Table 2-1. The aimed goal, within the setting of temperature
monitoring of cooling devices, is the ability to always reach the right decisions. As
referred in section 2.1, the task of monitoring within this setting is mission critical.
Hence, an error of second kind has to be avoided in any case. In contrast, an error of
first kind is only a false alarm that is indeed disturbing but not dangerous.
6 See chapter 3 for details
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