Technical Resources
Articles, tools, and product documentation for specifying platinum resistance temperature detectors.
Technical Articles
IEC 60751 Explained
What IEC 60751:2022 actually specifies for Pt100 sensors: the Callendar-Van Dusen equation, tolerance classes AA to C with their ranges of validity for wire-wound and film elements, the new "-sp" marking system, and what a fractional "1/10 DIN" tolerance really promises.
Article · 8 min read Read the ArticleWhat is Alpha (α)?
The temperature coefficient of platinum resistance sensors: how α = 3.851 × 10⁻³ °C⁻¹ is defined and calculated under IEC 60751, why the industrial value is deliberately lower than pure platinum, and the legacy curves — including the JPt100 — still encountered in the field.
Article · 6 min read Read the ArticleWhy Wire Wound?
Wire-wound and film platinum sensors compared honestly: the partially supported coil construction used in standard thermometers, the wider IEC 60751 validity ranges wound elements carry in every tolerance class, a fair account of what film sensors do well, and where each technology is the right choice.
Article · 6 min read Read the ArticleTools
RTD Element Tolerance Calculator
Calculate the nominal resistance of a Pt25, Pt100 or Pt1000 element at any temperature, check the permitted tolerance for each IEC 60751:2022 element class (W 0.1 to W 0.6, F 0.1 to F 0.6), and grade a measured resistance against the classes and their ranges of validity.
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Frequently Asked Questions
Answers about what TDI manufactures, detector tolerances, finished-thermometer responsibilities, prototype quantities, production orders and delivery planning.
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