Contemporary Control Systems BAScontrol20 User Manual - Manual (Page 16)

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4.3 Universal Input
— Configured as Temperature Input
The BASC20 has built- in calibration curves for 10 kΩ Type II or Type III thermistors.
These devices have a non-linear negative coefficient of resistance to temperature
and provide a nominal resistance of 10 kΩ at 25°C. With a web browser, configure
an input Channel Type for either Type II or Type III thermistor. As shown in
Figure 5 ,
connect the two-wire thermistor to points A and C. Polarity is not an issue. If
averaging of temperature is desired, connect multiple thermistors in a series-parallel
combination so that the nominal resistance remains at 10 kΩ as shown. Make sure
that all devices are of the same type. The effective range of measurement varies by
type.
Type II 10 kΩ thermistors range from –10º to +190 ºF (–23.3º to +87.8ºC).
Type III 10 kΩ thermistors range from –15º to +200 ºF (–26.1º to +93.3ºC). An open
input results in a fault condition and no LED indication for that point.
Figure 5
— Thermistor Connections