Which RTD characteristic describes long-term performance?
A. Span
B. Resolution
C. Gain
D. Stability
View Answer
Answer: D
Explanation:
Stability refers to an RTD’s ability to maintain its accuracy and resistance-temperature characteristics over a long period of time.
A highly stable RTD will produce consistent temperature measurements even after years of operation, repeated thermal cycling, and exposure to industrial process conditions.
What Stability Means
Minimal drift over time
Consistent calibration performance
Reliable long-term measurements
Reduced recalibration requirements
Why Stability is Important
In industries such as:
- Oil & Gas
- Power Plants
- Pharmaceuticals
- Chemical Processing
temperature sensors are expected to operate accurately for many years. A stable RTD ensures that measurement errors do not gradually increase due to aging or environmental effects.
Why the Other Options Are Incorrect
Span
- Difference between the upper and lower measurement limits.
Resolution
- Smallest detectable change in measurement.
Gain
- Ratio of output change to input change, commonly used in control systems.
Stability
- Describes the ability to maintain performance and accuracy over time.
Because long-term measurement reliability is determined by how well a sensor resists drift and maintains calibration, Option D (Stability) is the correct answer.