Buying a Thermistor for Heat Detector Project - Factors to Consider

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what factors i had to take into account by buying a thermistor for my project of heat detector?

my project circuit is attached.
 
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waqarrashid33 said:
what factors i had to take into account by buying a thermistor for my project of heat detector?

my project circuit is attached.

What can you tell us about thermistors? What are typical resistance ranges for them? What are you doing in the circuit that you've shown us?