An RTD (Resistance Temperature Detector) is fundamentally a sensor whose resistance changes as its temperature changes.
Understanding RTD Sensors
At its core, an RTD operates based on the principle that the electrical resistance of certain materials varies predictably with temperature. According to the provided reference, the resistance of an RTD increases as the temperature of the sensor increases. This relationship between resistance and temperature is not only well-established but is also repeatable over time, making RTDs reliable for temperature measurement applications.
Key Characteristics
Based on the definition, an RTD possesses several important characteristics:
- Temperature-Dependent Resistance: The primary function relies on the change in electrical resistance directly corresponding to temperature fluctuations.
- Positive Temperature Coefficient: As the reference states, the resistance goes up as the temperature goes up.
- Repeatable Relationship: The specific resistance-temperature relationship is consistent and reliable over the sensor's lifespan.
- Passive Device: An RTD does not generate an output signal on its own; it requires an external current or voltage to measure its resistance and thus determine the temperature.
In summary, an RTD is a precise and stable sensor used to measure temperature by monitoring the change in its electrical resistance.
