Abstract
A novel thermal bistable circuit which consists of a positive temperature coefficient (PTC) thermistor and a constant current generator has two stable states with low and high output voltage level. When the temperature or velocity of a surrounding fluid exceeds a critical value, the circuit is triggered and it rapidly changes its stable state. Both triggering levels of an input thermal quantity can be continually adjusted by circuit parameters. The thermal parameters of the fluid (for instance temperature, thermal conductivity or velocity) and a defined duration of power supply interruption may be detected and memorized.
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