Catalogue

Explore Thermal Developments International's full range of high-performance platinum resistance thermometers and sensors, including detailed specifications, construction options, and tolerance classes for industrial and laboratory applications.

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Brochure

A practical reference to Thermal Developments International's resistance thermometer assemblies—covering construction types, lead options, tolerance classes, and application guidance for high-accuracy industrial and laboratory use.

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TDI Information Sheet: IEC Standards for Industrial PRTs

Thermal Developments International Ltd produces precision platinum resistance temperature sensors in compliance with international standards. The latest IEC 60751 Edition 2.0 (2008) standard maintains the established resistance-to-temperature relationship but introduces updated tolerance classes such as W0.1, W0.15, and W0.3. TDI continues to offer a wide range of tight tolerances—including 1/10 DIN—ensuring exceptional accuracy and stability across demanding industrial applications.

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TDI Information Sheet: What is Alpha (α)

Thermal Developments International Ltd explains the temperature coefficient of platinum resistance sensors, known as Alpha (α), which characterizes how resistance changes with temperature. Defined in IEC 60751:2008 as approximately 3.851 x 10⁻³ °C⁻¹, Alpha is a critical parameter for high-precision measurement. TDI also offers detectors to alternative standards, including the US and Japanese curves, with Alpha values of 3.916 and 3.900 respectively, ensuring flexibility across diverse applications.

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TDI Information Sheet: Why Wire Wound RTDs?

Thermal Developments International Ltd specializes in wire wound platinum resistance thermometers, delivering superior performance over film types. Wire wound designs offer wider temperature ranges, reduced self-heating, and exceptional stability. TDI’s expertise lies in coiled platinum sensors, with over 6 million detectors produced since 1983. Their sensors are trusted in high-accuracy, low-drift, and laboratory-standard applications, and are exclusively used by Isothermal Technology in its precision thermometry products

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TDI Information Sheet: Industrial Resistance Thermometry up to 700°C

Advancements in glass technology and high-temperature sheath materials have overcome the traditional 450°C limit of Pt100 thermometers, eliminating issues of resistor drift and sheath contamination. These innovations enable Pt100 sensors to operate stably and reliably up to 700°C—exceeding the aluminium point of ITS-90 (660.323°C).

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