Geosense TP-1, Инструкция по эксплуатации

Страница: 4 / 16

4
V1.0 Oct 2020
1.2 Theory of Operation
The NTC (negative temperature coefficient ) 3K thermistor sensor has a resistance that
decreases with increasing temperature and with a coefficient >4%/ºC allows it to detect
very small changes in temperature.
They have a non - linear output that is represented by the Steinhart–Hart equation.
T= (1 / (A + B (LnR) + C(LnR) 3)) – 273.2
Where: T = Temperature in degrees Centigrade
LnR= Natural log of Thermistor resistance in ohms
Readings can be made with a wide range of readout units including the VWR - 1, MP12
which display the reading directly in degrees Celsius or resistance Ohms or by an
ohmmeter in combination with look - up tables.
Readings can also be automated using an automatic data acquisition unit such as a Linx
Logger, WI - SOS VW Node, GeoLogger CR Series
(Continued from page 3)