Pt100PT1000

Pt100Pt1000 refer to a pair of widely used platinum resistance temperature detectors (RTDs) that form the backbone of industrial temperature measurement. The Pt100 series consists of a platinum wire or foil that measures 100 ohms at 0 °C, while the Pt1000 series uses 1000 ohms at 0 °C. Both devices are fabricated from pure platinum with a small amount of alloying elements to enhance stability and reduce temperature coefficient drift. The resistance of these sensors changes predictably with temperature, following the Callendar–Van Dusen equation, which provides linearity over a broad range.

The development of the Pt100 family began in the 1930s. By the 1950s, the Indian Standard Institute and the International Organization for Standardization (ISO) had jointly defined specifications for the Pt100, leading to the ISO 60751 standard. The Pt1000, introduced later, offers a higher resistance and thus larger signal for low‑signal applications, without sacrificing accuracy or linearity.

In practice, Pt100 sensors are favoured in applications requiring modest temperature ranges, such as HVAC, laboratory instrumentation, and consumer electronics. The Pt1000’s higher resistance makes it suitable for high‑temperature environments, automotive sensors, and industrial quality control where signal integrity is paramount. Both types are available in probe, bead, and tube configurations, and can be integrated into industrial process control systems via 4–20 mA or analog voltage outputs. Their high accuracy, long life, and proven reliability have made them the standard for many critical temperature measurement tasks worldwide.