Compared to thermocouples, RTDs generally provide what?
A. Lower accuracy
B. Better accuracy
C. Lower stability
D. Less repeatability
View Answer
Answer: B
Explanation:
RTDs (Resistance Temperature Detectors) generally provide better accuracy than thermocouples, making them a preferred choice for precise temperature measurement in many industrial applications.
RTD Advantages Over Thermocouples
Higher accuracy
Better long-term stability
Better repeatability
More linear output
Less measurement drift over time
For example, a standard Pt100 RTD can often achieve temperature measurement accuracies of ±0.15°C or better, depending on its accuracy class and installation.
Thermocouple Advantages
Although thermocouples are generally less accurate, they offer:
Wider temperature range
Faster response time
Better suitability for very high temperatures
Lower sensor cost
Typical Applications
RTDs
- Process industries
- Pharmaceutical plants
- Food processing
- HVAC systems
- Precision temperature control
Thermocouples
- Furnaces
- Boilers
- Kilns
- Gas turbines
- High-temperature processes
Because RTDs provide superior measurement accuracy, stability, and repeatability compared to thermocouples, Option B (Better accuracy) is the correct answer.