SM150T User Manual 1.0
Appendix 2:
50
SM150T Temperature Measurement
The SM150T Temperature sensor uses a thermistor with a 10K resistance at
25 ˚C. However:
A. This sensor has a different response curve from the more widely used
10K3A1B type. The response curve is given in the Resistance to
Temperature Lookup Table on page 53
B. The Thermistor circuit shares the Power 0V wire. If the thermistor is
measured when the SM150T is powered, the measured resistance
measurement may need to be corrected for 18 mA SM150T supply
current.
Allow 20 minutes for the temperature reading to stabilise after installation.
Do not log at frequencies under 1 minute - in order to prevent thermal self-
heating errors.