Foil element are used for high accuracy surface and air temperature measurements.
Due to the sensors low heat capacity (big surface, low mass) the measured objects temperature is little affected and the response time is fast. Foil elements give also fast response time.
The resistance of a Pt100 sensor at -200 – 0°C is calculated according to this formula:
Rt=R0(1+3,9083×10-3t – 5,775×10-7t2 – 4,183×10-12(t-100)t3)
The resistance of a PT100 sensor at 0 – 850°C is calculated according to this formula:
Rt=R0(1+3,9083×10-3t – 5,775×10-7t2)
R0, resistance at 0°C. (100 Ohm) Rt, resistance (Ohm) at the temperature t. (°C)