The different RTD's types and classes explained

Thin film sensors -are available in tolerance class A & class B

Thin film sensors, which are the most broad-spectrum and economical platinum RTD sensors, offer many advantages. These sensors are uniquely flat, resulting in a rapid response time. In addition, they are durable and exhibit a high resistance to vibrations. A wide range of resistance values is available, including Pt50, Pt100, Pt200, Pt500, and Pt1000. Owing to these characteristics, thin film sensors are a popular choice in applications exposed to high vibrations, such as those found in the aerospace and automotive industries.

More about thin film sensors

SMD platinum sensors -are available in tolerance class B & class C (2B)

SMD platinum sensors, also known as Surface Mount Devices, are specially designed to be mounted on printed circuit boards (PCBs). They form the active measurement element on a PCB, playing a crucial role in the functionality of these boards. Predominantly, these sensors find their applications in the electronics industry and the semiconductor industry, where their precision and compactness are highly valued.

More about SMD sensors

Ceramic wire wound sensors -are available in tolerance class C, B, A, 1/3 DIN B, 1/5 DIN B, and 1/10 DIN B

Suitable for the thinnest RTD mineral insulated cables, ceramic wire wounds present an impressive level of versatility. They operate over a wide temperature range and exhibit a high level of resistance to thermal shocks, making them quite durable. These sensors are available in resistance values of Pt100 and Pt50. Their resilience enables them to be used for measurements in extremely high-temperature environments, up to 850 °C. Due to these attributes, ceramic wire wounds are frequently utilized in industries such as chemical processing and power generation, where such extreme conditions may be encountered.

More about ceramic wire wounds

Stator slot sensor

Stator slot style Pt100 sensors, typically ranging in length from 100mm to 500mm, are widely utilized in various applications. They are available in multiple resistance values, including Pt1000, Pt500, and Pt200. Common diameters for these sensors usually fall between 8mm and 12mm, offering a range of options to suit different requirements. Further enhancing their adaptability, these sensors can be equipped with silver, nickel, or tin-plated copper lead wires, available in a variety of AWG sizes. Recognizing the need for safe operations in potentially hazardous environments, certain models of these sensors have been certified as “intrinsically safe” and provide “increased safety” for explosive contexts.

More about stator slot RTD sensors

Resistance value’s RTD sensors

The IEC has industry standard classes of W.0.03, W0.1, W0.15, W0.3 and W0.6. These classes correspond to class 1/10 DIN, 1/3 DIN, class B and class C.

IEC StandardDIN4370Temperature Range ºCTolerance Ω at 0ºCTolerance ºC
W0.031/10 DIN-100 to 350100±0.012 Ω±0.03 °C
W0.11/3 DIN-100 to 350100±0.04 Ω±0.10 °C
W0.15Class A (1/2 DIN)-100 to 450100±0.06 Ω±0.15 °C
W0.3Class B (DIN)-196 to 660100±0.12 Ω±0.30 °C
W0.6Class C (2B)-196 to 660100±0.23 Ω±0.60 °C

Read more about the accuracy of RTD sensor classes such as Class A, Class B, 1/3DIN, and more.