Resistance Temperature Detectors

Many industries rely on resistance temperature detectors (RTDs) to sense temperature in their production facilities. Temperature sensor manufacturers want to ensure that these products are reliable and of the highest quality so that customers can improve efficiency and streamline operations. 

What Is An RTD?

Resistance temperature detectors (RTDs) are temperature sensors that measure and then proportionally change resistance value to correlate with temperature shifts. Often used in laboratory settings and industrial processes, RTDs have earned a solid reputation as accurate, stable, and reliable temperature sensors.

In structure, RTDs include a ceramic or glass core wrapped in wire. Due to their inherent fragility, a sheath is often necessary for protection. An RTD functions as a temperature sensor because the element is made from a material whose resistance at given temperatures is known. Thus as the material’s resistance changes, the temperature is also changing, and the relation between these two factors allows operators to determine exact temperature.

RTD elements can be either thin-film or wire-wound in construction, with each type being best suited to specific environments and use cases. Platinum is often the metal used in modern RTD elements. While RTDs are generally seen as being reliable temperature sensors, there are several factors that can affect their accuracy:

• Temperature
• Wire length
• Wire Size
• Construction

To deal with these variables, standard RTD classifications have been developed for ease of use. Wire length and size also have tight tolerances necessary to ensure accuracy. A three-wire RTD is most commonly used. 

As longtime temperature sensor manufacturers, RAM Sensors understands your need for absolute precision, and we only offer the best products, such as RTDs and thermocouple sensors. We can also assist with thermocouple calibration. Contact us today to learn more about our offerings.