The article links to this as a temperature sensor:
http://www.produktinfo.conrad.com/datenblaetter/175000-199999/182907-da-01-en-IC_ZTK_33.pdf
That does not look correct... am I missing something?
You're not missing anything! That particular component is a
temperature-compensated voltage stabilizer, which means its behavior
varies in a known way with respect to ambient temperature. Note that
ALL conductive materials have thermal coefficients; things like
thermistors just use materials with particularly high coefficients to
create a bigger working signal. While that part only superficially
looks like a diode, it's also true that diodes find common use as
temperature sensors embedded in silicon (e.g. your computer's CPU's core
temperature sensor is probably a diode).
As to why the designer chose that particular part, I can't guess! I can
only imagine that its operating temperature was in the right range for
the application (I suppose the coffee-roasting temperature doesn't
exceed 150 C?) and provided a useful signal when connected as described.
Hope this is informative!
Cheers,
-Brian
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