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T h e r m i s t o r s
YSI 44000 Series
Precision Interchangeable Thermistors Time Constant
YSI thermistors provide highly accurate and stable The time required for a thermistor to indicate 63% of a
temperature sensing for applications of temperature mea- newly impressed temperature is the time constant. For a
surement, control, indication and compensation. Typical thermistor suspended by its leads in a well-stirred oil bath it
uses include precise measurements without the neces- is 1 sec. max. for standard thermistor and 2.5 sec. max. for
sity of individual circuit calibration and with the advantage teflon encased thermistors. In still air it is 10 sec. max. for
of precision interchangeability of sensors. Precise cold standard thermistors and 25 sec. max. for Teflon encased
junction compensation of thermocouples may be designed thermistors.
directly without "bread boarding" after mathematically de- Dissipation Constant
riving the circuit because of the superior interchangeabil- The power in mW required to raise a thermistor 1