A temperature transmitter using a 3-wire RTD has a resistance of 105.8 ohms at 0°C and 148.5 ohms at 100°C. What is the temperature measurement in °C if the transmitter is currently measuring a resistance of 110.2 ohms?
A. 10.3°C
B. 25.3°C
C. 50.8°C
D. 75.5°C
Answer:A
A temperature transmitter using a 3-wire RTD has a resistance of 105.8 ohms at 0°C and 148.5 ohms at 100°C. What is the temperature measurement in °C if the transmitter is currently measuring a resistance of 110.2 ohms?
A. 10.3°C B. 25.3°C C. 50.8°C D. 75.5°C
Explanation: The temperature-resistance relationship of an RTD is typically approximated as linear over small temperature ranges. The resistance value of an RTD increases with temperature, and the relationship is typically defined at two points: 0°C and another temperature, in this case, 100°C.