The Model 103 Thermistor Temperature Probe utilizes a
negative temperature coefficient (NTC) thermistor housed
in a closed, stainless steel shaft to provide quick and
accurate temperature readings.
The sealed, electrically isolated stainless steel
enclosure provides fast response and allows temperature
data to be recorded concurrently with pH, REDOX,
conductivity, or other electrochemical measurements
without affecting the sensor behavior.
Functional
The Model 103 Thermistor Temperature Probe,
like all NTC thermistors, decreases in resistance as
temperature increases. The MicroLab interfaces measure this resistance by applying a
precisely measured voltage, accurately measuring the
returned current, and applying Ohm’s Law ( R = V/I) to
calculate resistance. One can, if desired, use the
formula tool to calculate and display this resistance to
explore the temperature/resistance response of the
sensor.
The Model 103 Thermistor Temperature Probe is designed
to work with all MicroLab nterfaces.
MicroLab software utilizes the Steinhart-Hart equation
to calculate the temperature of the thermistor, a
technique used throughout industry and in research labs.
Since the Steinhart-Hart relationship is
non-linear, the effective resolution of the temperature
measurement increases with increasing temperature.
With the MicroLab 402, at 0oC it is 0.01
oC, at 20 oC it is 0.006 oC,
and at 70 oC it is 0.001 oC.
Because the MicroLab industrial thermistors are
matched to +/- 0.2 oC in manufacture, one can
use the provided calibration file for any of the the
MicroLab 103 family thermistors.
